close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2132975

код для вставки
Oct.,11, 1938. '
P. E. sHAvL-:R
2,132,975
WELDING METHOD AND APPARATUS
Filed Feb. 2l, 1935
25
4 Sheets-Sheet l
27 29
66
> Oct. 11, 1938.
P. E.. SHAVER
2,132,975
WELDING METHOD AND APPARATUS
Filed Feb. 2l, 1935
HNEHHH
_l
LL!
F/G .4.
4 Sheets-Sheet 2
v
Oct. 11, 1938.
P_ El SHAVER
2,132,975
WELDING METHOD AND APPARATUS
w/r/vfss.- `
@WL-@í '
'
Per”
Lî/çayef
Patented Oct. 11, 1938 `
2,132,975
`
p UNITED STATES PATENT OFFICE
2,132,973
`
WELDING METHOD AND APPARATUS
Perry E. Shaver, Philadelphia, Pa., assigner to
Sun Shipbuilding à Dry Dock Company,
Chester, Pa., a. corporation «of Pennsylvania
Application February 21, 1935, Serial No. 7,525
7 Claims. (Cl. 219-8)
This invention relates to a welding-method
ing' and expensive and the results far from sat
and apparatus particularly designed for the weld
ing of elongated articles as, for example, the
isfactory.
_
It is the object of the present invention to
provide for holding parts to be welded and the
electric welding of elongated tubes or the like in UI
such fashion as to prevent substantial warping
or bending during the welding operation, and
permit, for example, the holding of fins 4to a tube
and a number of lines of welding to be pro
duced simultaneously. The operation, further 10
welding of ñns upon tubes.
y 'I'his application is, in part, a continuation of
my application Ser. No. 694,597, filed October
, 21, 1933.
Considerable diñ‘lculty has been heretofore ex
perienced in welding viins or the like upon long
10 tubes such as are used, for example, for heat
transfer purposes in stills, condensers or the
like. Diiilculties have been encountered partic
ularly Where there are a number of fins to be
held in place and welded simultaneously, as, for
example, when a tube three inches or four inches
in diameter and twenty or more feet long is to
have welded to its outside and running length
wise of it six or eight fins by a continuous weld.
Tubes of this type are of such considerable length
'20 that they are flexible to an appreciable degree
in themselves and, furthermore, are to be asso
ciated with ñns which are not of great thickness
more, can be made automatic and is of this na
ture in the preferred embodiment of the inven
tion, the tube or other elongated article being
moved vertically past electrodes fed at a fixed
point. The method and apparatus forming the 15
subject matter of this invention are further
adapted to facilitate the handling of long pipes
or the like, which has heretofore been diñlcult
during welding operations.
-
While the invention is applicable particularly 20
to securing fins or strips of various shapes upon
elongated tubes of circular or other cross-sec
and which are, consequently, also‘flexible, usu- »
tion, or elongated members of various shapes,
ally more so than the tubes.
the method and apparatus are also applicable to
the closure of seams, particularly where there 25
The operation of
25 holding these fins in proper place against the',
tubes and welding one iin at a time as, for ex
are a number of lengthwise extending seams to
ample, by hand welding, is so tedious, time
consuming, and expensive as to prevent the use
of this type of tube wherever possible, although
ior certain types of apparatus a tube of such
type would be highly desirable.
be closed simultaneously. This, together with
other useful features of theA apparatus, will be
brought out more fully in the following descrip
tion when read in conjunction with the accom 30
panying drawings, in which
Furthermore, in the case of a tube of con
Fig. 1 is a diagrammatic sectional view illus
siderable length, the application of heat to one
trating the association of parts designed for
side, as occurs when only one or two welds are
35 made at one time, brings the tube locally to the
4automatically carrying out the'method;
Fig. 2 is a plan `view showing a'plurality of 35
associated welding heads arranged to simultane
ously produce eight welds in the attachment of
high welding temperatures, causing such sub
stantial warping as to materially interfere with
eight uns;
l proper contact between the two parts to be welded
together and to render the tubes useless because
of lack of straightness after the welding opera
tion is completed.
Heretofore the only method of welding ñns on
a long tube has involved carefully clamping the
fin against the tube and subsequently using a
45 hand welding apparatus to feed an electrode into
" and along the line of Contact of the ñn with
the tube. In general, it has been necessary _to
attach the ñn tothe tube locally by means of
welds of short extent. .In any such case, not
only- does there occur the warping referred to
above, but where the addition of a number of
rinato each tube is necessary, the welding ap
paratus must be run the complete length of
the tube for the fixation of each one. The op
erationl has accordingly been very time-consum- v
Fig. 3 is a detail View showing pneumatically
operated means for holding ñns and a tube in
'
proper assembled relationship;
‘
Fig. 4 vis a section taken on the plane indi
cated at 4_4 in Fig. 3 showing details of the
holding means;
~
Figs. 5 and 6 are end views illustrating the 45
type of work which may be accomplished by the
use of the apparatus;`
Fig. 7 is an enlarged detail view showing the
relationships of various parts adjacent the weld
ing electrodes;
_
450
Fig. 8 is a sectional detail showing the mount
ing of a tin-holding roller; and
Fig. 9 is> a wiring diagram showing certain of
the control elements of the apparatus.
The particular apparatus shown hereinlis-55>
E
2,li32,975
adapted to handle tubes having a length of twen
ty feet or more with diameters of three to four
inches to which are to be attached eight fins
running- substantially the full length of the tubes.
The apparatus for-handling such tubes is illus
‘trated because tubes of such lengths carrying
welding operation. Two such roller shapes are
indicated in Fig. 3, from which the type of en
gagement which is secured will be apparent.
Springs 28 react between the brackets IB and
ñanges on the piston extensions 2d to normally
urge the pistons outwardly to the interior of the
such a number of fins present major dii‘ûculties
tubes or cylinders I2.
in handling not only due to their size alone but
their flexibility and the difficulty of spacing,
ln the present case, these holding means are
illustrated as operated by~ fluid or air pressure.
It will be obvious -that in place thereof mechan
holding and welding such a plurality of fins si
multaneously.
The working ñoor or platform 2 supports a
stand Il on which the welding elements and other
mechanism are mounted. The stand or -plat
form table ¿i is provided with an opening t ex
tending inwardly to its center, which is pro
vided with a circular opening as shown in Fig. 2.
The floor 2 is also provided with a laterally ex
tending opening in order that the tubes may be
20 presented to the apparatus from the side, the
tubes being originally on a floor below the plat
form 2. A socket member It is provided initially
located adjacent the lower ñoor „t by which the
various parts to be assembled and welded may
25 be at least initially supported, although prefer
ablythey are also supported by this socket dur~
ing the welding operation. As illustrated in Fig.
`
ical means may be provided to secure,- for ex
ample, by the use of suitable springs or screw
arrangements, the application of the desired
pressure to the parts being welded. rI‘he rollers
26 may engage the ñns, or if the fins are not op
positely placed, certain oi’ the rollers .may be
made to engage the tube walls.
A welding head 3@ supported by the platform
¿l is provided for the making of each weld. Each
welding head may be ci substantially conven‘ 20
tional character, the electrical arrangementsof
`which are hereafter broughtout more fully. ' So
far as the mechanical features are concerned, it
may be stated that the heads are provided with
rollers for feeding welding wires 32 from supply 25
reels 33, the wires being fed through elongated
guiding tubes 3d to the line where welding is to
7, member I0 carries'a socket II so shaped as to atake place, for example, where the fins contact
receive the fins to be attached vto the tube and with the tube. AProvision is made yin the usual
fashion for grounding the tube to provide a re 30
the- tube itself, the tube being additionally sup
ported upon an upright post I3, which serves for turn circuit.
ln the preferred embodiment of the invention
its guidance. The particular socket used de
pends upon the individual work which is being which is illustrated, two motors are provided, one
done, sockets of special shapes being provided for
each job. Instead of separate sockets, of course,
adjustable lower holding means may be provided
to takercare of Various types of Work. In the
-present case, the tube A is designed to have se
cured to it a plurality of ilns B of various shapes,
40 as indicated in Fig. 3.
Located at suitable intervals between the sock-A
et member I0 and the position of the welding
electrodes are suitable holding means designed to
maintain the parts to be welded together in
for securing the slow rise of the work during the
progress of the welding operation and the other 35
to secure a rapid movement of the work during
lowering and initial adjustment. These two,
rnotorsv are indicated at 36 and 96 respectively
and are designed to drive, through individual
clutches, a suitable reduction gearing indicated 40
at 35 and shaft 31 which, through bevel gearing
38, serves to rotate a vertically extending screw
40. The socket member l0 is provided with a
threaded hub 44 engaged on the screw so that
v45 proper assembled relationship.
These are illus ‘ as the screw rotates the socket member is moved '
trated as comprising curved tubes i2 and I2' vertically, being restrained against rotation by
carrying inwardly directed pistons I4. In the the slight engagement of an extension upon a
present case two of these holding means are il- y
vertically extending rod 46.
lustrated' which are identical except for the fact
Details of both of these holding means are il
The screw 40 -has attached to its upper end a
reversely threaded screw 42 which may be ad 50
justed relatively to it by a hand ratchet arrange
ment indicated at 48. 'I'his ratcheting arrange
ment not only serves to secure a relative ñne ad
lustrated in Figs. 3 and 4.
The tube I2 in each case is provided with a>
justment of the two screws, but also to lock the
two together so that, during normal operation, 55
50 that the pistons I4 ln one case extend horizon
tally and in the other case at an angle to aiïord
support directly adjacent the welding electrodes.
55
plurality of inwardly extending stui’ñng boxes I6,
each of which is arranged for the guidance and
iluid-tight passage of a piston I4. A plate 20
serves to support individual guiding brackets I8
60 through which extensions 24 threaded to the
pistons as indicated at 22„are adapted to ex
tend. 'I‘he threaded arrangement is provided to
the socket I0 carried by the lower one moves op
positely to a nut member 50 carried by the upper
one. 'I'his nut member 50`is held against rota
tion by sliding engagement with the rod 46. The.
nut member 50 has secured thereto a cable 54 60
which passes over a pulley,52,supported either
directly by a roof or‘by a. traveling crane. Such
enable ñne adjustment to be made to insure that crane is’deslrable if it is necessary to move Vthe
proper equalization of -holding pressure is ap-‘ work after the welding is completed to a sub
stantial lateral extent to- a point of delivery. 65
65 plied about the tube. 'I'he extensions 24 are pro
vided with bifurcated ends 25 supporting pins 29
on which, through the medium of roller bearings
21, there are mounted holding rollers 26 having
their peripheries properly shaped to engage the
70 particular fins which are being applied. It will
ì be noted that the bearings liet'wholly within the
axial limits of the rollers.
~Such. arrangement
» serves to prevent to a considerable extent' the
rentrance of spattered metal into the bearings,
75 such spattered metal being produced during the
The cable 54 may be -secured tothe top of the
work in any suitable fashion, for example, t6 `a
member clamped to or secured within the tube
A. The ñnished work is indicated at A' in Fig. 1.
The supply of air or liquid for the operation
of the pistons I4 is provided through a tube 55 -
which communicates through a three-way valve
58 with a pipe 62 connected to branches 64 and 68.
A pipe 60 provides for the exhaust of fluid from .
the three-way valve when it is desired to release 76
3
2,132,975
the holding means from the work. A hand oper
ated valve 66 interposed in the line 84 may be
used to control the introduction of iiuid to the
upper tube or cylinder l2’.
Communication to
the lower cylinder I2, however, is controlled by
a manual or automatically operating valve 10
which is of three-way type and serves to control
the delivery of iluid to the cylinder through pipe
14 or its exhaust from the cylinder through pipe
lll 18. Normally when pressure is applied to hold
the work, the valve operating handle is in its lower
position. An extension 16 on the socket member
lll, however, is designed to move the handle 'l2
upwardly as it rises, cutting ofi the supply and
exhausting the cylinder l2 so that the pistons i4
and the rollers 26 are withdrawn from the work
to enable the socket member to pass.
There is best shown in Fig. 3 the type of work
which is accomplished by this apparatus. Each
oi the fins B is welded to the tube A as indicated
interlocking control devices to lnsur/e the proper
combined operation.
„
;
\
There is indicated at 80 a constant potential
generator driven by a motor (not shown) sup
plied with commercial current.
Because of the 5 y
>necessity for ilexlbility of operation and close con
trol, it is desirable to use direct current for the
drive of the parts and consequently' the gen
erator is of a direct current type so arranged as
to maintain a substantially constant line po 10
tential of about _sixty volts irrespective ci varia
tions in the commercial supply. ’l’lce'constant
potential leads from
generator are indicated
at 82 and 8B.
,
The armature of the hoist motor 36 is indicated 15
by that numeral in Fig. and is connected across
the line through a reversing switch ‘2id and a relay
switch 88, there being in the circuit . overload
relay coil 85 adapted to open coute 3 @l if an
excessive current is taken by the met
"Fh
l@ o@
along its entire length, the welding wires being - tactor Si is illustrated in the lower portier n lf3’
diagram in its relationship to otite control de
into the junctions as indicated in Fig. 2. .As
soon as 'the welding starts after the parts to loe
welded are assembled, suiliclent engagement in
the nature of a tacking is provided so that as the
tube A. is lifted, the fins B will be lifted there
with. While the socket member l0 may be used
initially, therefore, it need not ,necessarily be
utilized after the welding begins for the raising
@il ci the tube. It may accordingly be arranged
so as to have only a limited movement, although
in the particular arrangement illustrated it serves
for the support of the tube throughout substan
tially its entire movement. Its upward rise, of
course, ceases as soon as it clears the threads on
the screw I0. The rollers 26 are primarily relied
upon to maintain the parts in proper alignment.
The welding takes> place as slow upward move
ment of the tube and fins occurs. Due to the
fact that the tube is vertically and peripherally
guided as it moves, there is no substantial `tend
ency for the parts to become misaligned by ilexure
or warping. Warping is particularly prevented7
45
when a number of iins or the like are being simul
taneously welded to the tube, by reason of the
evendistribution of heat about the same. Even,
however, if only a. single iin or flange is being
attached, the type of support which is used,
namely, vertical suspension, prevents a dis
turbance of the proper relative positions of the
elements. The pressure applied by each of the
vices. The motor 3E is provided
‘llelcl 8|! in series with which there
rheostat 552 which is adjustable to
'
a `
`
rheostat
speed ofmay
operation
be short-circuited
or. the hoist
by 'the contact ,
@d in order to secure e. larger starting torque.
This contacter Sli will
erred to
Since the high speed aisé; motor' not inter“ 30
eonnected
shown
in ‘the
with wiring
the automatic controls,
This motor
it
may be of any desired ‘type operated either
the constant potential supply or directly '
1.
the commercial supply the plant.
3f
cated
Theatarmature
|22. This
of generator
the welding
is driven
generator
by aismotor
which may be energized either from the constant
potential supply or the commercial supply. A
separate exciter (not shown) supplies the shunt 40
field ||8 of the welding generator which has a
series field l24. Welding current is supplied
through this series field, a reactor §26, contacter
|28 and relay coil |38 to the line 82 and to the
welding line |32 connected to the electrode i258, 45
which is adapted to weld the grounded work i3d.
A separate generator is supplied for each elec
trode and in the present instance the connec
tions are diagrammatically illustrated in such
fashion as to cause the Welder to be of the con
rollers 28 may -be of the order of one hundred
Welder is well known and involves the automatic
feed of the electrode wire in such fashion as to
pounds. After the welding is completed, the
maintain a certain predetermined arc.
55 tube may be discharged by the suitable lateral
displacement of the cable as the nut 50 is caused
to move rapidly upwards by the rapid operation
of the motor 86.
'
50
stant current automatic type. This type of
Only so
much of the control devices is illustrated as 55
serves to indicate the relationship thereto of cer
tain control relays referred to hereafter. The
control devices include a motor H0 provided with
In order to-lnsure the production of proper re
sults, it is desirable that an apparatus of this
a shunt iield ||2 directly connected across the
constant potential line, said motor driving a con 60
type should be automatic to as great a degree as
possible so that if any accident occurs which
trol generator |88 vwhich is connected through
might result in improper work, the entire opera
tion will be interrupted. If welding by any one
of the units should be interrupted, all of the weld
a relay control contactor |40 and reversing switch
|42 to the armature IM of an electrode feed motor
which is provided with a shunt field |46. The
fields |48 and |52 are interconnected to the con
65
ing should cease. Furthermore, if, for some
reason as. for example, an overload, the feed of
the Work should slow down, the welding should be
stant potential lines 82 and 84 and to the weld
ing current line |82 through an adjustable po
tentlometer I 48 and relay control contactors |58
interrupted, otherwise welds of improper type
would result. In order to provide a substantially
complete automatic operation, various electrical
and |84 as illustrated. Switch |42 may be manu
ally operated to eli'ect forward or reverse feed of 70
elements are provided of the types indicated in
Fig. 9, which figure represents a wiring diagram
showing not only the major operating elements
such as motors and generators, but also various
thé‘welding wire. The control is otherwise auto
matic and of conventional type to insure a proper
feed during the' operation. The contactors |40,
|88 and |84 are controlled as described belor.y
The lower portion of Fig. 9 illustrates the auto
i '
.
arenoso
matic connections which insure a proper related
operation oi the various elements of the appara
tus and particularly insure a complete shut-down
whenever one of the arcs rails. Certain of the
parts of this controlling assembly are duplicated
erator i136 and wire feeding motor ldd. Closure
of contactor l'lél energizes relay coils il@ and lit.
The former closes the contactors l5@ and 55d,
energizing the ñelds ldd'and i552 of the motor lill?
and generator §33, respectively, thereby causing
to the number oí welding heads which are pro
the generator to operate the motor to feed the
vided. In order to indicate the interconnections ‘ wire forwardly toward the work. The closure of
' of the parts when a plurality ci welding heads are
contactors t28 closes the corresponding welding
associated as in the present case, the parte a circuit so that when the wire electrode contacts
sociated with one welding head are shown in full with the work an arc will ‘be struck. As the in 10
lines, while certain parts associated with a sec
dividual arcs are struck, the corresponding relay
designated
ond weldingbyhead
numerals
are shown.
corresponding
in dotted with
lines,those coils it@ are energized, closing the contactors 2 l@
and opening the contacts âäl. As each contactor
of elements of the ñrst head, primed. From this
arrangement, showing the association of parts
for two heads, it will be obvious how duplication
2t@ is closed, the corresponding relay coil 2id is
energized, closing its associated contactor Zit.
‘When all ci’ the contactors 2id corresponding to
can be continued to the extent ci taking care ci
any number of heads.
the welding heads which are in operation are
Each of the welding heads has its individual
start switch itâ and stop switch il@ intercon
nected as diagrammaticaliy illustrated so that
when the start switch is closed the stop switch is
opened. if only some of the total number oi
welding heads are to be operated, then the ap
paratus is prepared by closing the switches it@
of those heads which are to be operated and
leaving switches ldd open (and consequently llt
closed) ci those heads which are not to be used,
It will` be noted that the various switches lill
3@ are shunted across corresponding relay controlled
contactors 2115. As will be clear hereafter, the
various contactors 2i@ for the several units are
arranged in series to close a circuit only if all of
contactors di@ are closed or, alternatively, if for
3d, each contactor 2l@ that is not closed there is
closed the corresponding switch il@ to complete
the series.
Two interconnected switches l5@ and 55d, which
may be designated as “inch” and “run” switches,
are provided, there being a single pair of these for
the entire apparatus. During normal operation
the “run” switch läd is closed. The purpose of
the ‘inch” switch will be referred to hereafter.
A master stop switch itâ and start switch l5@
are provided, the former serving to shut down
the entire apparatus and the latter, by its de
pression, serving to set into operation the various
controls to bring the Various parts into action in
proper
sequence.
y
~
,
The construction of the control circuit will be
clear from a description of the operation involved
in starting up the apparatus. Assuming that
everything is shut down, the proper switches ltd
are closed to predetermine the welding heads
55 which are to be put in operation. As pointed out
above, for any switch |68 that is opened, the cor~
responding switch llt is closed. The operation
50
closed, they, together with the closed switches
il@ of the idle heads, complete a circuit from the
junction 22@ through normally closed switches H32 20
and H58 through relay coil ld@ to line 86. The
coil itt is thus energized, closing contactors it@
and itt. The coils itlâ shunted by resistances
itt are adapted to produce a time delay action
in the control of contactors 2 l 6 in order that fluc
tuations of short period or normal instability of
the arcs will not result in shutting down the ap
paratus, contactors 2 it remaining closed through
such transient disturbances. The resistances 226
which are shunted across coils 2id whenever the 30
relay coils it@ are deenergized, also serve to aid
in such stabilization.
The closure of contactor itt does not imme
diately effect any result, since its circuit >is open
at contactor 2id. Closure of contactor E815, how
ever, through normally closed overload relay con
tactor 9i, connects junction 222 to line 82. Such
connection through normally closed contactor
lill energizes relay coil §38, which opens contactor
is@ and closes contactor H92. Closure of E92 in
turn energizes relay coil ist, resulting in closure
of contactors it@ and |198. Closure of §98 serves
to energize the time delay coils 2M and 262,
which serve to thereafter prevent rapid drop
ping oi’ the contactors controlled by coils i88 and
ist. The time delay is adjustable through the
resistance means indicated at 2M, connected
across the coils it@ and 2t?. Closure of contactor
ist simultaneously with ldd serves to energize
both coils 2% and 20d. Energization of coil
2% closes contactor 9d, short-circuiting the ?leld
rheostat 92 for the purpose indicated above of
insuring high starting torque of the welding
hoist motor 36.
`
Energlzation of coil 268 _closes contactors 2l@
and 2id and opens contactor itl. Closure of
contactor 2id connects 'coil 20d between junction
222 and line '8d and consequently this relay is
of the entire apparatus is then initiated by clos
ing the master start switch i513 and holding such self-holding. The opening of contactor itl de
energizes coil itt and consequently, due to the
switch closed until all of the arcs are struck.
Closure of l5@ energizes relay coil ltd, closing time delay action, contactor it@ is closed and
contactor itt. The closing of contactor ltd B92 opened after a predetermined interval. The
serves to connect the junction 220 to the line t2., closure of itil results in energization of coil 2li
this junction being used as a convenient refer
through now closed contactor 2id. Consequently,
contactor t8 is closed and the welding hoist mo
65 ence point in the further description of the oper
ation.
tor started, the torque being initially quite large
The energization of 22@ serves, through each of
the closed switches E68, to energize a correspond
due to the continued closure of contactor 9d.
The opening of H92 results in deenergization of
coil lllél. Accordingly, after a predetermined in
terval, contactors ist `and ist are opened, re 70
sulting in deenergization of .coil 296, which drops
contactor Qt, thus bringing into the shunt field
circuit of the welding hoist motor the adjust
able rheostat 92. The motor then operates at
its predetermined speed to move the work prop 75
ing relay coil W2 of which there is one for each
70 welding head. These relay coils, together with
il@ and llt, are not shown duplicated, since the
connections of the individual sets will be readily
understood. Energizatlon of coil H2 serves to
close contactors lll@ and llt. The former of
75. these closes the circuit between the control gen
5
2,132,975
. erly past the welding electrodes.
Finally, coils
through one or more of the closed switches |68
The closure of contactor 2M now connects
through the corresponding relay or relays |12
serving to set into complete operation the asso
ciated welding heads in the fashion outlined
2ß8 and 212 remain energized.
junction 221| to line 82 through the contaetor
ce |86.
Since energization of 220 now results in
continued energization of relay |30, this relaybe
comes self-holding and the master start switch
l54 may be released to its normal opened posi-->
tion. Its opening deenergizes relay |64, which
lil, drops contacter |66.
The apparatus vis now in its normal running
condition, the work being moved upwardly by
the welding hoist motor and the arcs being main
tained in proper condition automatically.
The stopping of the apparatus either automati
cally
diie 'to manual intervention is dependent
upon
rgization
coil itil. if the master
stop
solo d2 is opened, it will be obvioi‘ts` that
auch deericigsation will result causing contactera
let and im'ì
be dropped so that the coil will
ierglzed upon release of stop switch
,y opening of switch. ißt, causing a
of
203 and consequently of
ïxeenergíoation ot inaction itil re-1
salts lo sperling of. the relays 'which control the
‘weldlrlf
initially
It is also
locating
sometimes
the work
desirable,
preparatory
particularly
to start
ing the welding, to cause the slowly operating
hoist motor rather than the high speed hoist
motor to more the work without, however, irl-a
ltlatirig action of the Welling heads. La order to
accomplish this, there is provided the switch 22d.
which is normally operi and may be opened after
closure 'oy depression or a button ‘225 connected
thereto.
Closure of switch 221i results in einerN
gization of the junction l22, which, due to the
opera'orls described above, results in the startm
'beingorunder
tire welding
substantial
hoisttorque
motorby3E,reason
the of 'the
'îïritial short circuiting ci the rheostat 92, whi i
'
series with the shunt field 9G by
'”` contacter Si.
.
the Various automatic electrical
" - l ltioried alcove, provision is made
2d so
rater circuit and also the wire iced
ing apparatus. Stepping might also occor due
overload of the welding hoist motor, which
‘will
contacter
to be opened, thus «aleen
ergirio relay 20d and opening the circuit, de
energ‘.I
relay lil@ loyk causing ari opening ci
contacter
The apparatus will accordingly
again :
alcove. It will be obvious that taclring or the
like can be accomplished.
. down.
" ers is effected bi"
'cy connecting -
@triatlon oi the main valve
it to a source or' compressed fluio. î
Their with»
drawal is effected by connecting th " cylinders
to the atmosphere through passage
y arl-other
down ol’ the apparatus also results ,manipulation or" the valve 58. The lower old-ing
members, however, can be withdrawn ‘for the
reason just indicated by movement ol the valve
handle l2 by the contact with it of the extension
resulting from freezing of the electrode to the lâ carried by the supporting member it, such
Glosl
i from dropping orally one of the contactera 216
diie to more than momentary breaking of the
are or e. short circuit of the welding generator
work. lo the latter case the voltage of the weld
contact serving to move the handle 'il to its upper
g«n crater" drops oi’f, dcenergizing a relay |30
to such extent as to cause it to drop contact 219
position to vent the cylinder i2 to the atirl-os-s _
just as it will if an arc should become broken.
lower members may, of course, be effected by
hand manipulation of the valve
El. "rali/e t5
serves to cut out the upper holding me allers if
it is desired
manipulate only the lower ones.
Preliminary manual adjustment of the screw
ilîl relative
screw 4U is provided by the ratchet
t3,‘which can be used to tighten
cable 5t so
that it does
share
the siii-poli ol the
When contact 219 is dropped, the circuit or coil
iiß is again immediately closed through the
Variable resistance 22d and contacter Ztl.
action el coll 2|8 is thus made sluggish and
vents immediate dropping of the contacter
‘The interval before the dropping of the
named contacter
The
pre-s
2|6.
last
also to some extent cori
trolled by adjustment oí resistance |83. Al~though contacter ‘Mil opens before 22| closes,
the operation. is very fast and takes place before
the coil ‘M8 is entirely deenergized.
After the apparatus is closed down for any of
the above reasons, it must be restarted in the
-manner described by pushing the master con
trol button |54 so that the parts oi' the apparatus
are brought into operation in proper sequence.
It is sometimes desired to produce welding at
only one spot for the purpose of tacking or the
like. To eilîect such result, it is only necessary
to push down the “inch” button |56 after there
pliere. Separate 'manual manipulation
work.
ln the preliminary ajustements, '
also be used
operation oi the wel ‘ i
these
replay ».
heist
motor
manipulation
independently
or" switch
ci ttl.
tlieweldipg
ln the placing
means of
the work and the removal from the apparatus
after welding has been completed, the high speed 55
reversible motor 9B is, of course, used.
-As pointed out above, the method and appam
ratos of this invention are applicable to perform
the welding operations to produce dih’ererit types
oi elongated tubes. In Fig. 5, for example, there 80
is shown a built-up tube of polygonal cross-sec
tion made from angle members G welded tow
has been closed one or more of switches |68 cor
gether at opposite corners as indicated at H. The
responding to the head or heads which are to be
angle members G may be held together by sult
able forms of rollers 26 and welding accomplished 65
simultaneously along the two seams I-I by the use
of two heads. At the same time, or thereafter,
there may also be attached iins such as indicated
at I. Fig. 6 is also illustrative of the character
of work which may be accomplished. Scams D 70
may be Welded to hold together the -two semi
circular parts C to form a iinished circular tube.
65 operated.
û
While the “inch” switch is in parallel with the
master starting switch 154, it will be noted that
the switch |58 is opened, thereby resulting in
operation only so long as the "inch” button is
held depressed against the action of a spring nor
mally tending to open it and close the “run”
switch |58. Because of the fact that “run”
switch |58 is opened, the coil |80 is not ener ` Such operation may be accomplished particularly
gized and therefore the welding hoist motor is where _the resulting tube is not to be perfectly
not operated. However, connection is made àrcular'in form but is to have an irregular shape 75
aisaere
which, in certain instances, may not loe capable
or” being rolled, Yout which may he built up by
such speed as to eEect proper progressive weld=~
ing.,
/f
,
welding together separate parts. Various types
a. lllfelding means including welding apparatus
ci fins or lengthwise runntng plates or the like
>may te attachee as indicated at
and Ir“, and
such attachments may "oe accomplished simulta
for suspending vertically arranged elongated arti=
occupying a substantially ñxed position, means
neously with
'welding of the parts of the tube.
To handle parts oi diiîerent forros of the types
iruiicatecir it is only necessary to modify the hold
cles hy their upper ends and for moving thernver«
tically in the, direction oi their lengths past
'
welding apparatus to produce progressive rv
ing, and means for holding in proper contact
ing means in a suitable fashion which will loe
portions of said articles which are to loe Weide@ l
olovious.
5. Welding means including welding apparatus
.
't vwill loe clear that various changes may be
made in the emeodimentoi the invention with
out departing from the scope thereof as donned
the following claims,
What L’ claim and desire to protect 'foy Lett-ers
“Patent is:
for suspending vertically arranged elongated
articles loy their upper ends and for moving them
vertically iu. the direction ci their lengths past
said Welding apparatus to produce progressive
welding, and means operative at a
_
il Welding means including Welding apparatus
occupying a substantially fixed position, means
for supporting elongated articles and moving
there in the direction oi their lengths at a prede
termined speed past said welding apparatus to
produce progressive welding, aud means :tor in=terrupting the welding if the predetermined
movement does not occur.
occupying a substantially :ïixed position, roe-aus
-
location
adjacent the Welding apparatus for pressing said
articles together to hold them
proper asseniu
bled relationship as they move vertically during 20
the Welding operation.
o. Welding means including a plurality oí sul:`=1
stantially fixed electrical Welding units, means
for suspending vertically arranged elongated
articles by their upper ends and forA moving them 25
2- Welding means including Welding apparat
vertically in the‘direction of their lengths past
ccupying a substantially ñxed position, means
said Welding units to produce simultaneous pro
gressive welds Toy said units, and means for hold
`ing in' proper contact
portions of said articles
ier supporting elongated articles and moving
them in the direction oi their lengths past said
30 welding apparatus to produce progressive Weld
which are to ‘be welded.
' 7. Welding means including a plurality of elecu
ing, and means including members occupying
fixed positions pressing said articles together to trical Welding units occupying a substantially
hold them in proper assembled relationship to< fixed position, means for supporting elongated
the said last means, and means for automatically
withdrawing said pressing members after a pre
determined advance of said elongated articles.
3. The method of welding vertically arranged
elongated articles comprising suspending said
articles yity their upper ends and moving them
di) vertically in the direction of their lengths past
used Welding apparatus, said advance'loeing at
articles and. moving them in the direction oi’
their lengths past said Welding apparatus to 35
produce progressive Welding, means for prede
termlnlng the Welding units, less than all there
of, `which are to operate, and means for substan
tially simultaneously initiating operation oi' such
predetermined units.
i
.
PERRY E. SHAVER.
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 339 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа