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Dec- 3,1946-
H. H.‘ HANSEN - 7
2,412,044
WELDING PRESSURE CONTROLLING APPARATUS
Filed April 13, 1944
- 2 Sheets-Sheet 1
Hal
Dec. 3, 1946.
‘
H. H. HANSEN
2,412,044
WELDING PRESSURE CONTROLLING APPARATUS
Filed April 13, 1944‘v
w,
2 Sheets-Sheet 2
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Patented Dec. 3, 1946
2,412,044
UNITED STATES PATENT OFFICE
2,412,044
WELDING PRESSURE CONTROLLING
APPARATUS
Hans H. Hansen, Warren, Ohio, assignor to The
Taylor-Win?eld Corporation, Warren, Ohio, a
corporation of Ohio
Application April 13, 194%, Serial No. 530,829
5 Claims.
(01. 219—4)
1
This invention relates to electric resistance
welding apparatus and more particularly to im~
proved devices for regulating or controlling the
pressure applied by the welding electrodes dun
ing the welding cycle. It is now common prac
ties to employ as an integral part of the welding;
machine an arrangement whereby the weld
pressure applied may be rapidly increased during~
the welding cycle and in accurately timed rela
tion with respect to the welding current ?ow,
The character and uniformity of the resultant
welds achieved by this double pressure method is
determined principally by the accurac; of the
timing of the application of the higher pressure
and it is one of the principal objects or" the pres“
ent invention to provide an improved apparatus
for shifting the welding pressure to a higher value
2
pressure controlling and changing assembly
whereby the operation of the welding machine
generally may be more efficiently monitored.
The above and other objects and advantages of
the invention will become apparent upon con
sideration of the following detailed speci?cation
and the accompanying drawings wherein there is
disclosed a preierred embodiment of the inven
tion.
In the drawings:
Figure l is a vertical section through a welding
pressure controlling apparatus constructed in ac
cordance with the principles of ‘the invention;
Figure 2 is a fragmentary section through a
portion of the apparatus of Figure l ; and
Figure 3 is a front elevation of a portion of the
apparatus of Figure 1.
Referring to the drawings, reference numerals
during
with greater
the welding
accuracy
cycleand
withconsistency.
greater speed
in the
it and i 5 indicate housing members ?xed on the
timing of the application of the higher pressure. El. principal frame or support of the welding ma
The present invention is an improvement on
chine on which the apparatus herein described
the apparatus disclosed and claimed
the comay be mounted and, in accordance with usual
pending application of C. E. Smith et 2.1., Serial
practice, such machine may be provided with a
No. 482,630, ?led April 10, 194-3, now U. S. Patent
welding electrode wheel it which is supported for
No. 2,363,753, which is assigned to the assignee
rotation about an axis normally ?xed with re
of the present application. In. said co~pcnding
spect to the housing or frame of the machine in
application the control of pressure and change
cluding the parts it and ll. A second wheel
in pressure is attained by employing two axially
electrode is may be provided and in actual prac
aligned bellows having a common wall mechani~
tice suitable means, not shown, is employed to
cally connected to the movable electrode of the
drive the wheels 42 and I3 and/or to move the
machine and relatively ?xed. outer end walls
work to be welded between the wheels as well as
moved by a ?uid pressure cylinder, the welding
to conduct welding current to the wheels as will
pressure applied being determined by the relative
pressures existent in the bellows. To increase the
welding pressure the bellows nearest the elec
trodes is exhausted. In the present improvement
the bellows are replaced with ?exible diaphragms
which have the important advantages of ram r
ing much less space thereby enabling the mecn—
anism to be constructed more compactly and en
abling the volume of air required to be exhausted
from the lower pressure chamber to be made much
smaller thereby reducing the time required for
the exhaustion and lending more consistency to
the timing of the application of the higher pres
sure.
A further object of the invention is the pro
vision of improved means for adjusting the op
eration of the pressure controlling and changing
apparatus whereby suitable compensation
be understood.
'
slideably received in .the housing provided by
the parts Ill and l l is a housing comprised of the
sections l4, l5 and It, the former being provided
with a rigidly attached yoke ll arranged to be
adjustably carried by a piston rod [8 depending
downwardly from a piston slideably mounted in
a cylinder it) which in turn is conveniently sup
ported on the housing member l?. Floatingly
mounted in the housing provided by the sections
M, [5 and It‘ is an assembly having a ring 20 the
outer peripheral edge of which is arranged to
rest on an inwardly directed shoulder formed by
the upper edge of the lower housing section I 6
all as shown in Figure 1. Covering the opening
through the ring 29 and rigidly clamped thereto
is a disk 2i and clamped. between the disk 2! and
be 50 ring 28 is the inner edge of a ?exible diaphragm
readily made for wear of the electrodes
varia
ring 22, the parts being provided with suitable
tions in the thickness of the stock being welded.
interlocking tongues and grooves, as shown, to
Another object of the invention is the provi~
securely hold the parts in assembled relation.
sion, in apparatus of the character described, of
The outer edge of the ring 22 is clamped between
means for indicating the proper operation of the 55 portions of the housing sections 14 and I5 thus
2,412,044
’
‘
3
4
providing in the section It a pressure chamber 23
which is normally ?lled with ?uid under pressure.
Movable electrode I3 of the welding machine is
carried by a saddle 24 having upwardly extending
formed on the housing section I6, and when con
tact 49 is thus engaged a circuit 50 is closed to
arms 25, the upper ends of which are joined to a
ring 26 which in turn is bolted to the vertically
position, i. e., resting on the internal shoulder
energize a suitable signaling device 5i to inform
the operator of the fact that the ring 29 is not in
?oating position.
_
I In operation, ?uid, preferably air, under pre
movable ring 26. As shown in Figure 1, there is
determined pressure is applied to the space 23
clamped between the rings 20 and 25 the outer
above the diaphragm ring 22 through a suitable
peripheral edge of a ?exible diaphragm ring 21
port, not shown, and similarly ?uid under pre
and the inner edge of this ring 27 is clamped be
determined pressure is applied to the space im
tween an annular surface of the housing section
mediately above the diaphragm ring 2'! through
56 and the ?ange of a member 23 which extends
the conduit 3! as explained above. At the start
down through a center opening in the housing
of a cycle of operation, particularly if the as
section it. As shown, member 28 is hollow with
sembly is used with stud electrodes for spot weld
its hollow space being in communication with the
ing, the housing Hi—l? is held in retracted or
space immediately above the diaphragm 2?. Lo
upper position by ?uid pressure applied to cyl
cated within the member 28 is a valve 28 which,
inder iil below the piston therein and upon the
when opened, provides a passageway between the
insertion of the work between the welding elec
space within the member 23 and an outlet port
38. A conduit 31 supplies ?uid under pressure to 20 troc es and the application of ?uid pressure now
to the top side of the piston and cylinder [9 the
the spaces within member 28 and above dia—
assembly iii-l6 moves downwardly bringing the
phragm 2'! under the control of a valve 32 which
electrodes into pressure engagement with the
closes upon opening of the valve 29, A solenoid
‘a
As the pressure exerted by the cylinder
33 is provided to operate valves 29 and 32 in the
manner more fully described in the above men- ‘
overcomes the pressure exerted by the ?uid
tioned co-pending application.
in the space 23 the ring 26 stops its downward
movement while the housing M~ll3 continues to
Integral with the yoke ii is a, thimble 3a in
move downwardly thus bringing the ring into
which isjournaled the hub 35 of a pulley 35.
?oating position with respect to the housing. At
Hub- 35 is interiorly ‘threaded to have screw
this time the welding pressure exerted will be de
threaded engagement with a threaded rod 37
termined by the pressure exerted by the ?uid in
which is rigidly connected to the piston rod 18.
space 23 less the opposing pressure exerted by
As shown in Figure l, the opening through the
the ?uid in the space immediately above the
center of the pulley 38 and a recess 33 formed in
diaphragm ring 27.
the upper wall of the housing section It accom
modates the lower end portion of the threaded
To initiate the ?ow of welding current I pro
rod 3'? when the hub 35 of the pulley 36 is screwed
vide a switch 52 carried by a part of the ?xed
up on the rod. This arrangement provides a
frame of the welding machine and having an
ready adjustment between the positions of the
operating lever adapted to be engaged by an op
carrying yoke I? and the piston in the cylinder
eratingnarm 53 secured to and extending out
l9 so that the position of the operating range of 4 ill wardly from the supporting yoke ll. Upon the
yoke ll‘ descending a predetermined distance
movement of the electrode l3 with respect to the
electrode I2 may be varied to compensate for
s‘
-h 52 is closed to close a, circuit 53 which is
wear of the electrodes and differences in the
operative, through suitable devices, to initiate
thickness of the stock being welded. Pulley 36
the flow of welding current. The various parts
is arranged to be driven by a pulley 39 through a ' of the apparatus are so adjusted that the switch
belt it, the pulley .353 being keyed to a shaft 4! ’
52 closes while the ring 25) is ?oating between
journaled in bearings carried by the housing sec
the shoulders formed on the housing sections it
tions I 4 and I6 and having an exposed end :32
and it. At a predetermined time following the
which may be engaged by a wheel lever or other
application of the welding current, as deter
gear, not shown, whereby the shaft 4! may be , mined by the setting of a timing circuit normally
rotated and the proper adjustment made.
employed in welding machines of the kind here
As shown in Figure 3, I provide a switch oper
in involved, solenoid 33 is energized to rapidly
ating and movement indicating assembly which
release the pressure in the chamber immediately
is responsive to movement of the ring 2|] relative
above the diaphragm ring 27 thereby withdraw
to the housing Ill-l6. Pivotally mounted on the . ing the opposing force and enabling the full pres
housing is an arm 43 which is adapted to be en
sure exerted by the ?uid in space 23 to be applied
gaged by an adjustment screw it which extends
to the electrodes. In this manner an accurately
through and has screw-threaded connection with
timed heavier pressure may be applied to the
a boss d5 which is rigidly connected to and pref
work during the welding cycle.
erably integral with the ring 28, the housing sec. 60
While I have illustrated the invention as ap
tion [5 having an opening out through which the
plied to a seam welder employing wheel or roller
boss 135 extends. Arm 43 is provided at its free
electrodes, it should be understood that the in
end with a pointer overlying a scale 436 to indicate
vention is equally applicable in any other speci?c
the extent of movement of the ring 20 with re
type of electric resistance welding machines.
spect to the housing Iii-it. Also carried by the
Thus stud or die electrodes, for example, may
housing is a rigid arm mounting a contact screw
be employed in place of the wheel or roller elec
4? which is adapted to be engaged by the lever
trodes shown. vWhen the invention is incorpo
43 upon upward movement of the ring 20 and
rated in a seam welding machine of the auto
boss 45 relative to the housing l4—! 6. Upon this
matic repeating type the piston in cylinder I9 is,
engagement taking place a circuit ‘38 is closed
of course, held in lowermost position and the
which circuit may be employed to reverse the ?ow
switch 52 held closed thereby maintaining cir
of fluid to cylinder l9 thereby retracting the mov
suit 53 conditioned for recurrent applications of
able electrode.
the welding “shots” which normally are synchro
I provide a contact 49 arranged to be engaged
nized with the movement of the work between
by the lever 43 when the ring 2!] is in lowermost 75 the roller electrodes. At the time of application
2,412,04a
5
6
of the welding current the spaces above dia
phragms 22 and 21 are both ?lled with ?uid under
pressure and subsequently solenoid 33 exhausts
the lower chamber to apply the higher pressure
as explained above. Before the next application
of current solenoid 33 is tie-energized to again
build up the ?uid pressure in the chamber above
secured to said wall to de?ne an expansible
pressure chamber immediately above said wall,
and a second. diaphragm ring having its outer
edge secured to said Wall and its inner edge se
cured to the bottom wall or" said housing to de
?ne a second pressure chamber immediately be
low Said Wall whereby the welding pressure ap
plied is the resultant of the opposing pressures
exerted by the ?uid pressures in the respective
diaphragm 21.
If the electrodes should Wear down appreci
ably or if the stock being welded should become 10 pressure chambers.
so thin that the ring 29 does not “?oat” during
2. In electric resistance welding apparatus;
the actual welding cycles the signal 5| will re
means to apply welding pressure comprising in
main or become energized thus informing the
combination a housing supporting one of the
operator for the need of adjustment which may
electrodes of the welding apparatus, means to
be readily accomplished by rotating the shaft 42
move said housing toward and away from the
to move the diaphragm assembly downwardly.
other electrode of said apparatus, a wall mount
During normal seam welding the signal 5! re
ed for limited ?oating movement in said housing
mains de-energized while during individual spot
and having rigid connection with said ?rst men
or projection welding accompanied by reciproca
tioned electrode, a ?exible diaphragm ring hav
tion of the diaphragm assembly signal 5! is nor
ing its outer edge secured to the side walls of
mally energized but should become de-energized
said housing and its inner edge secured to said
during the actual welding cycle, i. e., during the
flow of welding current. When the machine is
utilized in the latter manner the parts 3Ei—3‘l'
are so adjusted that the piston in cylinder IE3 and
consequently the housing l4—|6 can descend
sui?ciently to close circuit 48 which, as explained
above, reverses the pressure in cylinder l9 to
wall to de?ne an expansible pressure chamber
immediately above said wall, and a second dia
phragm ring having its outer edge secured to
said Wall and its inner edge secured to the bot
tom Wall of said housing to define a second pres
sure chamber immediately below said ?rst men
tioned wall whereby the welding pressure ap
plied is the resultant of the pressure exerted by
automatically retract the diaphragm assembly
and the upper electrode upon the completion of
the ?uid under pressure contained in the re
the welding cycle.
spective pressure chambers.
3. Electric resistance Welding apparatus com
,rising in combination a normally ?xed elec
trode, a movable electrode, a diaphragm having
It should now be apparent that I have pro
vided improved welding pressure controlling and
changing apparatus which accomplishes the ob
jects initially set out. The diaphragms 22 and
its yieldable portion rigidly connected to said
27 While offering ample ?exibility and range of
movable electrode and its ?xed portion rigidly
movement require little space in either direc
connected to the wall of the housing de?ning
tion thus enabling the assembly to be built more
pressure chambers on opposite sides of said
compactly. Further, and of greater advantage
diaphragm whereby the Welding pressure applied
is the fact that the pressure chamber exhausted 40 is the resultant of the pressure exerted on said
with each of the diaphragms can be made of
diaphragm by the fluid in the respective pres
substantially less volume so that the volume of
sure chambers.
air required to be exhausted in elfecting the
4. Apparatus according to claim 3 further in
weldingr pressure change is a minimum thus en
cluding means to move said housing toward said
abling greater speed and more consistency to be
attained in this phase of the cycle of operation.
normally ?xed electrode, means to adjustably
It follows, also, that the machine will consume
less compressed air or other ?uid used. The
signalling and indicating devices materially as
sist the operator in monitoring operation of the ,
machine thereby insuring continued proper oper
ation of the machine and consistent welds.
Since many changes may be made in the
speci?c embodiment of the invention illustrated
and described above without departing from the .
spirit or scope of the invention, reference should
be had to the appended claims in determining
the scope of the invention.
What I claim is:
1. In electric resistance welding apparatus;
means to apply welding pressure comprising in
combination a welding electrode support, a mov
able disk-like wall rigidly connected to said sup
port, a housing enclosing said wall and movable
with respect thereto in a direction toward and
away from the welding electrodes, a ?exible
diaphragm ring having its outer edge secured to
the side wall of said housing and its inner edge
1%
limit the movement of said housing in a direc
tion toward said normally ?xed electrode, and
means positioned outside of said housing to in
dicate the position of said yieldable part of said
diaphragm relative to said housing.
5. In electric resistance Welding apparatus
having a normally ?xed welding electrode and a
movable electrode the combination of a fluid
tight housing, means to move said housing to
ward and away from said ?xed electrode, means
to limit the movement of said housing in a direc
tion toward said ?xed electrode, a diaphragm in
said housing dividing the same into upper and
lower pressure chambers, means rigidly connect
ing said movable electrode to a yieldable portion
of said diaphragm, and valve means operative to
alternately admit and discharge ?uid under pres
sure to and from the pressure chamber below
said diaphragm whereby the welding pressure
may be raised and lowered while said housing is
in lowermost position.
HANS I-I. HANSEN.
I
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