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1380- 31, 1946-
JIB. TIEDEMANN
2,413,663
FLASH WELDING MACHINE
Filed Nov. 10, 1944
5 Sheets-Sheet 1
JLlZfLIS B. Tz'e demazm
INVENTOR
‘Dec, 31‘, 1946.
J_ B_ TIEDEMANN -
’
2,413?Q3
FLASH WELDING MACHINE
,
Filed Nov. 10, 1944
5 SheetséSheet 2
Julius B. Tzeclemann
m’
INVENTOR.
ATTORNEY.
Dec. 31, 1946‘ '
J. a. TIEDEMANN
2,413,663
FLASH WELDING MACHINE
Filed Nov. '10,‘ 1944
5 Sheets-Sheet I5
Dec. 31, 1946.
J, B, T|EDEMANN
‘2,413,663
FLASH WELDING MACHINE
Filed Nov. 10, 1944
5 Sheets-Sheet 4
1:15.41.
Julius B. 'I‘z‘edemann
INVENTOR
ATTORNEY
Dec, 31, 119461
' '
J. B. TIEDEMANN
2,413,663
FLASH WELDING MACHINE
Filed Nov. 10, 1944‘
5 Sheets-Sheet 5
Julizzs?. Tz'ecle
INVENT
1m
.
ATTORNEY:
Patented Dec. 31, 1946
2,413.663
UNITED STATES PATENT OFFICE
2,413,663
FLASH WELDING MACHINE
Julius B. Tiedemann, Milwaukee, Wis., assignor
to A. O. Smith Corporation, Milwaukee, Wis.,
a corporation of New York
Application November 10, 1944, Serial No. 562,771
15 Claims.
1
2
This invention relates to a flash welding ma
chine.
(Cl. 219—4)
-
One of the objects of the invention is to pro
vide a ?ash welding machine-for electric ?ash
welding large workpieces and in which the sides
are open for the ready loading and unloading of
the machine with the work loaded through one
side and unloaded through the other side.
Another object is to provide improved construc
l has a cross member 8 for receiving the tie
bolts ‘I.
A ?xed welding die support 9 constituting a
table top is disposed upon the top of plates 4 and
extends from the frame 5 to the position of the
seam cleft where it has secured thereto the lower
?xed welding electrode Ill. The frame 5 extends
horizontally above the support 9 and in spaced
relation thereto to a position somewhat short of
tion for quickly applying the Welding dies to the 10 that of the seam cleft. An upper electrode II is
work and releasing the work therefrom.
secured to the outer ends of a pair of horizontal
Another object is to provide a compact and
side arms I2 extending along the opposite sides
powerful pressure means for operating the slid
ing table to move the parts toward each other
during ?ashing and ?nal bump.
of frame 5 and pivoted thereto at l3 near the rear
end thereof to provide for up and down movement
15 of electrode II relative to electrode II].
Another object is to provide an automatic cam
pressure means for quickly upsetting the weld in
For the purpose of holding electrode II in the
desired vertical position and for pressing the
the ?nal stroke of the welding operation.
same toward electrode III to secure the work
Another object is‘ to provide for the automatic
therebetween, the arms I2 have short vertical
return of the sliding table upon release of the 20 links I4 pivoted to their outer ends and suspend
work from the welding dies.
ing the same from the end of an operating lever
Other objects and advantages will appear here
I5. The lever I5 is in turn pivotally mounted at
inafter in connection with the description of an
I6 upon the outer end of frame 5 and extends
embodiment of the invention illustrated in the ac
horizontally to have its opposite end connect with
companying drawings.
25 the vertical piston rod I‘! of a power cylinder I3
In the drawings:
mounted upon frame 5 near the tie bolts ‘I.
Figure l is a side elevation of the welding ma
The right-hand end of base I supports ?xed
bearing brackets I9 carrying the drive shaft 28
chine;
Fig. 2 is a top plan view of the welding ma
and operating mechanism. Between the bracket
chine;
I9 and the position of the seam cleft is mounted
Fig. 3 is a vertical central longitudinal section
a lower table top support 2| and an upper frame
' taken on line 3—3 of Fig. 2;
Fig. 4 is a transverse vertical section taken on
line 4—4 of Fig. 1;
Fig. 5 is a diagrammatic view showing the cams
and welding dies in the position they assume at
the beginning of a welding operation;
Fig. 6 is a view similar to Fig. 5 showing the
parts in the position just prior to the ?nal bump
of the welding operation; and
Fig. '7 is a view similar to Fig. 5 showing the
parts after the ?nal bump.
The welding machine has a fixed base I con
stituted of side and end plates 2 set on edge in
22, both movable longitudinally in slides 23 upon
plates 4 of base I. Vertical tie bolts 24 secure the
frame 22 to the support 21 and are disposed be
tween two vertical cross plates 25 which provide
rigidity for the structure.
The support 2| extends to the position of the
seam cleft where it carries a lower movable elec
trode 25. An upper electrode 2‘! is disposed above
electrode 26 and adapted to move vertically rel
ative thereto to clamp the work therebetween.
The electrode 2‘! is secured to the free ends of a
pair of horizontal arms 28 pivoted at 29 to the
centra1 portion of frame 22. The vertical position
of electrode 21 is determined by an operating le
ver as which is pivoted at 3| to the frame 22 near
the electrode and has its end secured to the free
ends of arms 28 by links 22. The end of lever 30
opposite the links 32 is secured to the vertical
An upper frame member 5 is secured to the 50 piston rod 33 of power cylinder 34 mounted upon
base I at one end by bolts 6. The bolts 1 addi
frame 22 adjacent the tie bolts 24.
tionally secure the frame 5 in ?xed relation to
The construction described provides a large
the base and pass vertically through the frame
space of substantial length horizontally between
5 near its center and through the base I with
the respective upper and lower electrodes and
top and bottom nuts threaded thereon. The base
frame members. The relatively long arms I2 and
rectangular formation and secured at the vertical
meeting edges. Bottom plates 3 are welded to
the lower edges of the respective plates 2 and top
plates 4 are similarly welded to the upper edges
of the plates 2 to provide rigidity for the base.
2,413,663
3
4%
28 provide for a substantially vertical movement
of the upper electrodes in clamping the work
upon the lower electrodes, and the employment
brackets Bl on the base I. The air pressure in
cylinders 58 is constant and is su?iciently low to
prevent possible injury to the weld if the clamp
ing electrodes were inadvertently not released
of a high lever ratio for the operating levers l5
and 38 provides high clamping pressures with
reasonably small power cylinders. The tie bolts
1 and 24 secure the parts against the clamping
pressures.
Current is supplied to electrodes iii and 26 from
a suitable welding transformer 35 disposed in the
base I and having ?exible leads 36 connecting its
secondary to the respective electrodes.
The
transformer 35 has its primary connected to a
power source 37 by leads 83 inwhich a switch 39
is disposed.
Current is similarly supplied to electrodes I i
and 21 from a suitable welding transformer 45
supported on a bracket M on the top of the upper
when the cam 46 and eccentric shaft 48 are re
leased. Then upon raising of the upper elec
trodes H and 21 by cylinders l8 and 34, respec
tively, the cylinders 58 automatically return table
2| and frame 22 to starting position wherein
. roller 41 engages cam it at the open position for
the seam cleft.
The work is then removed and
the machine prepared for the next welding cycle.
The welding machine of the present invention
has been employed in the ?ash welding of sections
of propeller blades end-to-end wherein a rela
tively long space has to be provided for receiving
the workpieces. The construction of the machine
provides this space and at the same time leaves
the front and rear sides open for loading and
frame member 5 and having ?exible leads d2 con
‘
‘
necting its secondary to the respective electrodes. 20 unloading.
The cam drive employed is direct and positive.
The transformer 60 has its primary connected to
the leads 38 by leads 43 at a point between switch
Where different articles requiring different
amounts of burn-off and ?ash are to be welded,
39 and transformer 35, to supply transformer MS
the cam 46 can be changed by replacing the
'
The drive for the machine comprises the main 25 removable surface blocks 62 thereon with a dif
drive shaft 20 operating in suitable bearings in
ferent set of blocks.
The machine may have various embodiments
the ?xed brackets I9 and driven by a motor M
through suitable reducing gears 45 at one end of
within the scope of the invention as set forth
the shaft. The center of shaft 2i! carries a
in the accompanying claims.
I claim:
cam disc 46 of substantial thickness secured
1. An electric ?ash welding machine compris
thereto for applying the welding pressure to mov
able frame 22 and table 2i. The cam 13$ oper
ing a base, a pair of relatively movable frames
ates by means of a cam roller 4'! or follower
supported thereon and spaced above the same,
which is rotatably mounted on shaft t8 eccen
electrodes carried by said frames for conducting
trically journaled in bearings 159 in the frame 22. . welding current to the work, a transformer sup
The shape of the cam 136 determines the move
ported on one of said frames for supplying cur
ment of table 2! and frame 22 longitudinally of
rent to the electrodes, ?exible leads for conduct
with current from the source 31.
the base toward the seam cleft to bring the parts
ing the current from the transformer secondary
together in ?ashing contact and to maintain the
to the respective eiectrodesrelatively movable
?ashing of the edges until ready for the ?nal 40 work supporting members on said base and dis
welding bump. This movement is illustrated in
posed to support the work against vertical clamp
Figs. 5 and 6 in which the cam 45 is shown to
ing forces of said electrodes, means to support
have rotated nearly a complete revolution from
said electrodes for substantially vertical move
the point of starting contact with roller 41‘ to
ment relative to said frames, and means for ap
the point where the edges of the work piece are 45 plying clamping pressure to the work by said
ready for the final welding bump.
electrodes.
'
The purpose of mounting shaft I58 eccentrica-lly
2. An electric ?ash welding machine compris
is to provide for the rapid advance of the table
ing a base, a pair of relatively movable frames
2| and frame 22 to produce the ?nal welding of
supported thereon, electrodes carried by ‘said
the edges of the work-piece. This is accom
frames for conducting welding current to the
plished by a crank 50 secured to shaft 68 and
operated by the piston rod 5| of a power cylinder
52. The power cylinder 52 is operated by com
pressed air, by means of the hose 53. A suitable
valve 55 controls the supply of air to cylinder 52 - v
and is operated by a .trip disc 55 on the end of
rotating drive shaft 25. The stroke of the piston
of power cylinder 52 is governed by an adjusting
screw 56 which is locked in the desired position
by a nut 51 adapted to engage the rear end of the
cylinder.
work, a transformer supported on one of'said
frames for suppiying current to the electrodes,
?exible leads for conducting the current from
the transformer secondary to the respective elec
trodes, relatively movable work supporting mem
bers on said base and disposed to support the
work against vertical clamping forces of said
electrodes, said electrodes being carried on long
arms disposed substantially horizontally and hav
ing their rear ends pivoted to the respective
frames to provide for substantially vertical move
ment of the electrodes through a short operating
movement, and means to apply clamping pres
The operation of the power cylinder 52 in ap
plying the ?nal welding pressure to the work
piece is illustrated in Fig. 7. The shaft 23' con
sure to said electrodes.
tinues to turn and when the weld is completed, 65
3. An electric ?ash welding machine compris
the cam ‘portion of disc 55 operates valve 5:2 to
ing a base, a pair of relatively movable frames
return the shaft G3 to its normal position, and
supported thereon, electrodes carried by said
cam 48 continues to its starting position where it
frames for conducting welding current to the
is stopped to await unloading and loading of the
work, a transformer supported on one of said
machine for another welding operation.
frames for supplying current to the electrodes,
The table 2! and frame 22 are constantly biased
?exible leads for conducting the'current from
to open position by a pair of air cylinders 58 on
the transformer secondary to the respective elec
opposite sides of the machine. The piston rods
trodes, relatively movable work supporting meme
59 of ‘cylinders 58 are connected to brackets 5&3
bers on said base. and disposed to support the,
on table 2!. The cylinders 58 are secured to 5 Work against vertical clamping forces of said
2,413,663
5
6
electrodes, said electrodes being carried on long
arms disposed substantially horizontally and
having their rear ends pivoted to the respective
mounted on said base and secured thereto at one
end, said frame having a horizontal arm extend
ing to said seam cleft and spaced above said
base to provide for the reception of a workpiece,
frames to provide for substantially vertical move
a support for the workpiece on said base, an elec
ment of the electrodes through a short operating
trode carried by said support and another by said
movement, a lever pivotally mounted on each
frame adjacent the seam cleft for clamping a
frame and having its short arm pivotally linked
workpiece therebetween and supplying welding
to the respective electrode support, and a power
current thereto, the upper electrode being mount
cylinder mounted on each frame and having its
piston connected to the long arm of the respective 10 ed on horizontal arms pivoted to said frame adja_
cent the opposite end thereof, a power cylinder
lever to effect raising and lowering of the elec
mounted on said frame, a lever operated by said
trode thereby.
cylinder for raising and lowering said upper elec
4. An electric flash welding machine compris
trode and applying clamping pressure thereto,
ing a pair of clamping jaws carrying cooperating
upper and lower electrodes adapted to clamp a 15 and a tie bolt securing said frame to the base at
the rear end of said frame arm and adjacent said
workpiece therebetween, a similar pair of clamp~
power cylinder.
ing jaws carrying cooperating upper and lower
8. In an electric ?ash welding machine, a long
electrodes adapted to clamp a second workpiece
narrow base adapted to provide a seam cleft
therebetween to be welded to the ?rst named
workpiece, said clamping jaws being supported 20 transversely thereof near the center, a frame
mounted on said base for movement longitudi
horizontally in opposed relation and presenting
a long opening between their respective arms for
receiving workpieces of substantial length in a
direction at right angles to the seam cleft be
tween the parts, and means outside of the extent ‘
of said‘ space for applying clamping pressure to
the respective jaws upon the workpieces while
leaving the front and rear sides of said space
open for the loading and unloading of workpieces
to and from the machine.
‘
5. An electric ?ash welding machine compris
ing a pair of clamping jaws carrying cooperating
upper and lower electrodes adapted to clamp a
workpiece therebetween, a similar pair of clamp
ing jaws carrying cooperating upper and lower
electrodes adapted to clamp a second workpiece
therebetween to be welded to the ?rst named
nally thereof toward and away from said seam
cleft, said frame having a work support table
top and an upper horizontal arm parallel to said
support and spaced vertically therefrom for re
ceiving a workpiece therebetween, an electrode
carried by said support and another by said hori
Zontal arm adjacent the seam cleft for supplying
welding current to the workpiece, the upper elec
trode being mounted on horizontal arms pivoted
to said frame adjacent the opposite end thereof,
a power cylinder mounted on said frame, and a
lever operated by said cylinder for raising and
lowering said upper electrode and applying clamp
ing pressure thereto.
'
9. In an electric ?ash welding machine, a long
narrow base adapted to provide a seam cleft
transversely thereof near the center, a frame
workpiece, said clamping jaws being supported
mounted on said base for movement longitudi
horizontally in opposed relation and presenting a
long opening between their respective arms for 40 nally thereof toward and away from said seam
cleft, said frame having a work support table top
receiving workpieces of substantial length in a
and an upper horizontal arm parallel to said
direction at right angles to the seam cleft be
support and spaced vertically therefrom for re
tween the parts, the lower member of each jaw
ceiving a workpiece therebetween, an electrode
having a substantially horizontal upper portion
spaced from the lower portion of said member 45 carried by said support and another by said
horizontal arm adjacent the seam cleft for sup
and parallel to the upper member of the jaw,
plying welding current to the workpiece, the
means upon said upper portion of each lower
upper electrode being mounted on horizontal arms
member for operating the corresponding upper
pivoted to said frame adjacent the opposite end
member to clamp the work, and means for tying
said lower portion and its corresponding upper = thereof, a power cylinder mounted on said frame,
a lever operated by said cylinder‘ for raising and
portion of said lower member together at the end
lowering said upper electrode and applying clamp
of the space provided for the work while leaving
ing pressure thereto, and a tie bolt securing said
said space open at the front and rear for the
work support and upper arm of said frame to
loading and unloading of workpieces to and from
gether adjacent said power cylinder.
the machine.
10. In an electric ?ash welding machine, a
6. In an electric ?ash welding machine, a long
base, an electrode clamping jaw mounted on said
narrow base adapted to provide a seam cleft
base for longitudinal movement thereon toward
transversely thereof near the center, a frame
and away from the position of the welding seam
mounted on said base and secured thereto at one
cleft, means normally biasing said jaw away
end, said frame having a horizontal arm extend
from the seam cleft, a power driven drive shaft
ing to said seam cleft and spaced above said base
rotatably mounted in bearings on said base to
to provide for the reception of a workpiece, a
the rear of said jaw, a cam mounted on said
support for the workpiece on said base, an elec
shaft for moving said jaw toward the seam cleft
trode carried by said support and another by said
as said shaft rotates, a movable member disposed
frame adjacent the seam cleft for clamping a
between said cam and said jaw and adapted to
workpiece therebetween and supplying welding
move said jaw in response to said cam, and addi
current thereto, the upper electrode being mount
ed on horizontal arms pivoted to said frame ad
tional means independent of said cam to move
jacent the opposite end thereof, a power cylinder
said member and effect a rapid movement of
the jaw away from the cam to apply the ?nal
welding pressure to the work.
11. In an electric flash welding machine, a
base, an electrode clamping jaw mounted on said
base for longitudinal movement thereon toward
and away from the position of the welding seam
mounted on said frame, and a lever operated by *
said cylinder for raising and lowering said upper
electrode and applying clamping pressure thereto.
'7. In an electric ?ash Welding machine, a long
narrow base adapted to provide a seam cleft
transversely thereof near the center, a frame
2,413,668
7
cleft, means normally biasing 'said jaw away
8
and ecoentrically mounted in said jaw, and means
from the seam cleft, a power driven drive shaft
to rotate said cam follower and thereby apply a
rotatably mounted in bearings on said base to the‘
rapid movement to said electrode jaw at a pre
rear of said jaw, a cam mounted on said shaft
determined time in the welding cycle.
for moving said, jaw toward the seam‘ cleft as
14. In an electric ?ash welding machine, a
said shaft rotates, a cam follower disposed to
base, an electrode clamping jaw mounted on said
engage said cam and ecoentrically mounted in
base for longitudinal movement thereon toward
said jaw to transmit forces from said cam there
and away from the position of the welding seam
to, and means to rotate said cam follower eccen
cleft, a power driven drive shaft rotatably mount
trically to apply a rapid movement to said elec 10 ed in bearings on said base to the rear of said
trode- jaw at a predetermined time in the weld
jaw, and a cam wheel mounted on said shaft for
ing cycle.
12. In an electric ?ash welding machine, a
base, an electrode clamping jaw mounted on said
slowly moving-said jaw toward the seam cleft
a predetermined distance, and means operable
without further movement of the cam for then
base for longitudinal movement thereon toward 15 advancing said jaw at a relatively quicker rate to
and away from the position of the welding seam
complete the weld.
'
-‘
~
cleft, a power driven drive shaft rotatably mount
(15. In an electric ?ash welding machine, a
ed in bearings on said base to the rear of said
?xed electrode clamping member for receiving
jaw, a cam mounted on said shaft for moving
a workpiece, a second electrode clamping mem
said jaw toward the seam cleft as said shaft
ber for receiving a workpiece and supported for
rotates, a cam follower disposed to engage said
movement toward and away from said ?rst named
cam and ecoentrically mounted in said jaw to
member, a power driven drive shaft disposed
transmit forces from said cam thereto, and means
transversely at the rear of said movable member,
operative in response to the rotation of said
a cam on said shaft for moving said movable
drive shaft to rotate said cam follower and there 25 member toward said ?xed member at predeter
by apply a rapid movement to said electrode jaw
mined rates which vary in accordance with the
at a predetermined time in the welding cycle.
requirements of a flash welding operation, an
13. In an electric flash welding machine, a
ecoentrically mounted cam follower carried by
base, an electrode clamping jaw mounted on said
said movable member and engaging said cam,
base for longitudinal movement thereon'toward 30 to engage said cam and transmit movement
and away from the position of the welding seam
therefrom to said movable member, and means
cleft, a power driven drive shaft rotatably mount
for operating the eccentric to provide a rapid
ed in bearings on said base to the rear of said
movement for said movable member at a prede
jaw, a cam mounted on said shaft for moving
termined time in the welding cycle.
said jaw toward the seam cleft as said shaft ro- , 35
tates, a cam follower disposed to engage said cam
JULIUS B. TIEDEMANN.
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