CA1068355A - Machine for pressure contact seam welding - Google Patents

Abstract

MACHINE FOR PRESSURE CONTACT SEAM WELDING

Abstract Disclosure is made of a machine for pressure contact seam welding, comprising a table carrying a work-piece and electrodes positioned opposite each other and electrically connected to each other. At least one electrodes is mounted so that it can be brought closer to the other electrode in order to produce an ela stic static force in the welding zone. The machine comprises a slideway to forcibly keep the welded material in the zone of contact with the workpiece and the electrodes, a real of the welded material, a pitch feed mechanism to deliver the welded material from the real to the zone where it is gripped toge-ther with the workpiece by the electrodes, and a device for separation of the required length of the welded material.
This device for separation of a required length of the welded material comprises, according to the invention, a mecha-nism for stopping the delivery of the welded material after it is welded to the workpiece, which is controlled by a welding end pickup and, as a result, the welded material is torn away in the zone of contact of this material with the workpiece and the electrodes.

Description

~68355 ~I!k~ adva~tag~ o~ this i~ve~tion corls~t~ hat th~
- cl~imed machi~e permits pro~uc~io~ o~ a hi~h-qualit~y wo~
pi0ce due to teari~ o~ th~ ~elded mate~ial dir~¢~ i~ t~
zone of ,it~ co~tact wi~h the workpiece a~d the ele¢trode~s"
which e~s~e~ preci~e matchi~ o~ the wel~ed m~erial ~d the ~ork~iece.

6~3S5 ~ hi~ ~entio~ relate~ to w~lding e~uipme~t andl i~
particul~, -to pEes~ure cont~Gt seQm wel~g machine~.
~ he i~ve~tioII ¢~ be 6uc~e3sfull~ employed for ma~ pro ductio~ of ~o~kpi~ces (e.æ~ actuating membe s o~ agric~l~
tllral ma¢hi~ ) ¢hara~yer~ed by ~rdened s~r~ac~9 as we~i as in ma~u~acturing variolls bimetallic wo~kpi0c~
~ ao~ ~ t~he art i8 a ma~h~n~ for pressure co~tact 8~-am w~lding comprisl~ a table oarryi~g l;h~ ~orkl?iece~ elee-~r~de~ made as roller~ a slidewa~ for for~ibl~ keepi~g th~
welded mate~ial in ~ha Zoll~ of coDtaGt ~i~h th~ wo~kpioce ~d electrodes, a r0~1 o~ the ~elded material" a p~tch ~ee~
me~haE~Iism to d~live~r the wel~d mate~ial ~rsm the reel to the zorle whe~e it is ~lamped to~ether w~th the ~u~ oce by t~e el~c~de~ aad a.devide ~or` ~p~ra~io~ o~ a requi~ed leagh~ o~ ~he welded mater~al. ~he alectro~es made as o~-~lexs ~xe po~itioned i~ the ~1~ machi~le opposite each o~h-e~ ~L ~e electr~call~ Go~ne~te~. In t~i3 cas~ at lea~
o~e elect~ods i~ moun~ed ~o thl~ it c~ be brought ~lo~e~
~o~0th~r wit~ the other ele~t~r~de to p~oduce a~ elastic ~a-tic iQrcs in the wel~ o~e~ ~ de~ice ~or ~eparatio~ of a re~uired lengllt o:e ~h~ welded material is plaoe~ bei;we3n t~e slidew~ for forcibl;y ~ee~i~g ~h~ welaed ma~erial i2~ e zo~e o~ it~ ¢o~ta~t w~th the worl~pie¢e a~d the electrode~ ' aad ~he pitch ~Eeed meG~ m fo~ d~liveri~g the welded ~aterla~
~ho d~ice a~ mad~ as po~sr ~hear~ dri~en by a pnou~aatic cylinder.

~06s3scj Be~ides~ t~e k~o~ machig~e i8 eguipp~d with a meoha-aism ~cr prel~i~arg unwiJId~ng of the lw~lded ~,~ter~al ~om tha ~eel~
~ ho )snow~ machine operate~ a~ fQI10~7a.
~ pret~eated ~or~pie&e i8 mo~ted o~ the table fo~ weld~ag w:~th the wel~d mat~rial. ~rh~ weld~d m~erial i~ p~ th~uæh thc DlechaEIi~ .or ~el~i~a~y ~aind~g o~ t~e ~ld~d mato-~ial ~rom the ~1 to the pitch ~eed m~cl~a~ sm ~or deli~
o the ~elded mater~al.
!I!he ~achi~e i8 ~witched on . ~he ~echa~i~m ~o~ ~el~
n~y ~ir~dillg o~ ~he w31d~d mat~rial ~ he ~eel w~wi~d~
a certai~ le~ght o~ ~he materi~l, b~t ~ot le~ tl~ equir-ad to doliver t~ material un~er the elsctrode~, throlle;h t~ d the ~lide~a;r ~o~ ior~ibl;y ke~i~; the weld~d ~aterial i~ ~he zoxle o~ co~tact ~ith the sso~ieco and the ~iLe-Gt~odes" ~d l~aturns to tho iait;ial po~ition~ ork;pi.ece i~
cla~ped ~ith ~he welded material by tho electrode~ with th~
help o~ a olampi~g d~ive~ ~e weld~ theJl ~tart-d b~
s~it~h~g on t~ ~Lectrode rotatio~ drive a~d passi~g the weldi~lg c~re~ through the ~ork~iece and th~ ~lded mate~
ia~.
- ~ this case tho ~elded materia~ is wl~ou~d ~o~ the r~l b;y th~ th~ust produc9d b;sr the elect~da~. Siaco th~ p9-~er shea~s are placed a~te~ the ~lidew~ for forc~ eep-~; the walded ma~erial i~ the zo~e of co~ta~t with the wor-kpiece ~d electro~3~ th~ weldod material i8 C~ bef~ e bhe material i8 welded to the ~orkpieoec Whe~ the welded ma~

~06~355 te~ial ~ cut, it~ ~nwi~in~; from the reel ~tops a~d tho re~t o~ t~ material i~ ~ldea t~ the ~so~pl~ce. ~h~ weldil~3ei~lg ~er the proces~ topped. ~he ~ead~ 7~0rkpie~e i5 r~meved from the table and a ~ew wor~pie~a i~ mou~ted therellpoJ~a ~h~ 03r611!1 iB t~10~ repeates:L.
~ kaown machi~e ~o~ pressure Go~act ~am weldillg ha the ~cllowi~g d~awba~s.
Sinca the ~h~ar~ for CU~itiDg the ~el~d m~t~rial ca~mot b~ loca1iod at th~ plao~ where the wcl~g to the Y~orls;piec~ e~d~, that ~ dir~ct~;sr a~t~r the eloctrodes, ~ho weld~ m~e~ial i3 ~ut ~I i~ ad~ ce a~d t~is res~lt~ i~ poor match~ o~ th~
e~d of th~ welded material ~ith th~ qorkpie~e a~d~ con~egu~n~lg, poor q~lit~ of the ~vorkpi~ce dua to nonu~iform distortion duri~g ~el~ of the rem~i~ing portion o~ t~ ~elded material :Et~ C~ltti the 3~3wr~ machi~e~ u~ed Yor curvil~ear ~g O:e the ~elded matsrial to t;he work;piece, its c~t-o~
and gets out of -the ~lidewa~y for forcibl~ eping o~ the w~ld~d material is the zolle OI co~tact with the ~or}~i~ce he eleotrod~s. ~e slid~ag c~ot hcla the welded ma-t~rial to tbe end o~ ~eld~g, becau~e i~ ca~not be pla~ed d~reatl~r to the weldi~s zo~e (under the electrode~ d this rssulta in ~Dol~i~g of a trai~ht portio~ o~ th~ ~eld~d mat~rial on t;he rema~i~g p~rt of the wo~piec~, ~hich ca~rlot coincide with the curvilinea~r Qo~BtoUr on the ~or~piece. Thi~
al80 reduce~ the qualit;y o~ th~ ~orkpiece.

1~3161~3355 Tho ~hear~ ~or th0 preli~i~ar~ cu~ti~g of a ~equired len~th of the wel~ed material i~stalled i~ the known machi~e demaad that a l~g-pitch ~eed mecha~ism ~or deliv~ry o~ the welded material be ~itted ~herein, becau~e ths welded materi~l ha~ to pass du~i~g the prelimi~ar~ cutti~g throuæh at l~a~
th~ shear~ a~d the ~lideway ~or rorcible keepi~g t~e w~lded material ~ ~he zo~e o~ co~tact with the workpiece a~d the el~ctro~ ~nd un~er the~e electrod0~. Practical e~perie~c0 d~mlstrat~d tha~i ia order to i~crease th~ e~iciency tha spee~
o~ th~ welded material deli~rer;y url~e~ the ~leGtrQdes ha~ t~ ~e ~ncreas~d. ~ re~ult~, c~n~deri~g the dela~ of the ~eel with the ~selded material, i~ that the weldea material is t~rn or delivared i~ao~ura~el;s~ to the ~or1~;piece owi~ to slippage the ~elded material i~l tho pitch fee~L mech~ism. ~he me~ha-m for prelimina~ ur~indi~g o~ the w~lded ma~erial i8 provi-dod i~ ~o machine ~or th~ pupose.
q?hus~ installAtion o~ a lo~l~g-pitch ~eed m~ha~ism ~:
a Dlec~ ism for preliminar;~ unw ~ diD~ of ~he matorial :Ero~a tho reol mtikQ8 th~ ¢onstructio~ of the machin~ mo~e compli-¢a-t~d.
Beside~, whe~ the weldod mat~rial i~ insu~ic:ie~tl;sr ~igidp ~pecial devi~o~ ~re r~guir~d to k~ep tha matarial a8 it i5 pUShe.a th~ough the shear~ a~d the slidewa;y fo~
~orcibl~ ~eepin~ the welded material i~ the zo~0 ~ cs~t~c~
with the wo~ekpiece a~d el~Gtro~e~.
It i~ e~ ob~ect O:e this iI~VO~iO~ to ~1iminate the ab~-v~ des¢~ib~d drawback~.

~al68355 ~ he p~sent inve~tio~ i8 aimed to provid~ a mac~ or press~re corltact ~am wel~i~g" whorein the de~ of the devi¢e for ~eparation o~ a r~quired 10~gllt of the welcLed mat~rial per-mit~ teari~; o~ the wela,~d material ~1~ a reg~red place, which ensures precise matchl~g oi~ the ~elcLed material wit~ the wo~-pi~c~ .
It i~ the mair~ obj~ct o~ thi~ ro:~tioa to pro~ide ~u~ha machi~e ~or p~ess~re cox-tact ~am w~ldi~g a~ ~o oE~sure iligh guality o~ work;pieces.
Thi~ object is achieve~ b~ that a m~ch~e i~ providod for pressu~e co~tact 89alll welai~, whiGh com~i~es a ~abl~
carxyi~g the wor~plec0, elect~ode~ lscat~d opposite e~ch other a~ electrically co~nected to each other, at least o~le electro~e i~ ~ou~ted ~o that it caa be brought to~ether wi-th the othsr electrode to produce arl ala~tic static ~orce ill the weld~l3 æone ~ a sli~ew~y to ~orcibl~r keep the welded ma~erial in ~he zolle of contact ~rith the ~Horkpiece a~d the electrocles, a reel of th~ welaed material, a pitch. Ieed mechanism to deliver ~he weldsa ma~erial ~rom the re~l t~ the zo~e where it i~ elem~ed toge~her ~ith ~he wor~piece b~ the elec:trode~ and a de~ice ;eor separatioa o~ a reqlaired le~t~ o~ the welded materi~ Rherein, a~cording to the irive~tio~, t~e devic~ ~or separa~io~ or a requlred le;~agth of the welded material compri~es a mecha~
for ~topp~g the deli~er~ o~ the welded material at t~0 end o~ it~ wel~n~; to the wor31:piece, ~h~ch i8 controlled b~r the ~el~ end pick~p.

~068355 ~ 3~ch co~t~uctiox~ OI the device ~or separatio~ o~ a re-q~red len~th of the welded material e~s~e~ hi$h gualit;sr of th0 worl~piece OWil~g to the ~act that the welded materia~
i~ to~ o:~f di~ctly in tha Z0~:18 O:e it~ co~tact with t~
workpiece a~d ele~tro~ a preci~e ma~¢hin~ o~ the welclea material a~d the workpiece 1B ensure~.
Th~ ~uality o~ a wor}~piece ~ith a curvil~ear ~eldiDg co~to~ i~ al~o improve~ because, i~ the ~slded material i~ to~n oIf in t~e zo~e o~ it~ coIIta~t with the ~orkpieee a~d electrodes9 it ean~ot get out of the slide~ ox ~orc~bly ~e~P~e th~ weldea material i~l the zorle o~ ¢o~t~ct ~i~h the wor-kpiece ancL electrodes be~ore it i~ tern ard is w~ldea t~
th- workpiec~ preGisa~y alon6 the re~uire~ contour.
~ 1!~ device ~or separatio~ o~ a ~equired len~ht o~ the weldeà mate~ial made aecorcLinE t;o the inve~tioa permits better q~lalit~ oi wor~iece~ d si~lie~ eoxlstructi~ Or the maclhi~ie for pre~sure co~itact; seam ~elaing9 because th~
~aterial is torrl off i~ the zo~ o~ its eontact wlth the ulor}~ie~ electro~ and ther~ is ~o x~oe~ in the 10D~-pitch ~eea mechani~ i~ce a~ter the ~el~ed mat~ri~l i8 to~
o~, it remai~ the imme~ate vic~it r of the eleotrodes.
~ m~Ghar~ or preliminary uzawi~ding o~ ~he ~elded mate-rial i5 ~lolt ~eede~ for the 8ame rea80ng.
Whe~ the lPeld~d matarial i~ ~ot rigid e2:loug~, it i~
~t~ ot ~eguired to provided ~pecial ~evices to koep thi~
welae~ material when it is ~ed to the zor~e of contact ~ith the worlcpiece aDa elect~o~les, because the welded material re-main~ ~ this zonc o~ ¢o~tact ~ith the wor~?iece an~ electrodes a:eter ilt ia tor~ o~.

~06~335S
J_~
One of the embodiments of the device for separation of a required length of the welded material is a mechanism for stopping the delivery of the welded material, which is a clamp comprising a housing having a through opening for pas-sage of the welded ma-terial and an accentric, which pivot axis is secured on the part of the housing located under the welded material and which is rotated by an electromag-net electrically connected to a welding end pickup.
This permits reliable and simple solution of the prob-lem of stopping the welded ma-terial at the required moment.
The welding end pickup can be made as a limit switch kinematically connected to the table carrying the workpiece.
Determination of the welding end by means of the limit switch is the most simple and practicable solution.
It is advisable that the kinematic connection of the limit switch and the table carrying the workpiece be made as cams placed on said table.
In order to simplify and rationalize the location of the mechanism for stopping the delivery of the welded ma-terial (as close to the zone of contact of the welded mate-rial with the workpiece and electrodes as possible) the ho-using can be the slideway for forcibly keeping the welded material in the zone of contact with the workpiece and ele-ctrodes.
The invention will now be described in greater detail with reference to a specific embodiment thereof, taken in conjunction with the accompanying drawings, wherein:
Fig. 1 shows a schematic general view of a machine for pressure contact seam welding, according to the invention;

g ni ~ ig. 2 show~ a dimi~hed vlew o~ Plg. 1 ts~en alo~lg t~e ~rrow A.
:Fi~ i 8~0WS schematicall~ embodiment o~ a mecha~aiE~m for ~oppi~g the d~livery o~ the ~elded material~ accordi~g to the inventio~.
The di3elo~ed machi~e ~or pre~sure coDtact ~eam w81di~g compri~es a t3ble ~ (~ig. 1) carr~ing a workpi~ce 2, electro-de~ ~ a~d 4 m~de as rollers, locate~ opposite each ~thar and ~lectricall~ connec~ed to eac~ other. One of the ~lect-rode~ 4 i~ mounted so that it ca~ be brought closer togeth-~r with the other electrode 3 to produc~ a~ ela~tic static ~orce i~ ~he welding zone ~ b~ mea~s o~ ~ drive 5 ~or bri~g-ing together the electrodes 3 a~ 4 ma~e as a pneu~ic cg-~inder~
Tbe electrode 3 can be rotat~ ~ ~ a drive ~ot show~). Thi~
drive ia ~ot described i~ detail herein, as well a~ sQ2e ~ther unit~ ~ tha machi~e~-na~elly: the machine ¢ontrol s~stem, cooling ~ystem and the electrode curre~t i~put ~ysto~, pow~r suppiy of the electrodes, et¢, to avoid ~omplicati~g the e~planation of the esse~se o~ the i~vention.
~ he machina ~or pressure ~ont~ct seam wel~n~ compri~0s ~ sl~deway 6 ~or foroibly k~epis~ ~ welded material 7 i~
ths zo~e o~ contact ~ith the workpiece ? and the ~lactrod 3 and 4. The lideway 6 ~a~ a bo~ ~e¢tion and i~ secur~d o~
a~ axi8 8 on ~hich it ca~ ti~ o ~he axi~ 8 is rigidlg atta-c~ed to ~ ~rame 9. The bo~ section of the slidew~y 6 rOr ~Ll;3168355 foreibl~ keep~g the welded material 7 a~d i~s attachme3t en-sure reliable d~ ery OI th0 weldsd m~t~rial to the weld-i~g zo~e Bo ~ he machi~ also comprises a reel ~O contai~ ; the welded mate~ial a~d a pitch feed mechanism 11 for delivery of the welded ma~eri~l 7, which ~s made as eccentric stopR
12 moved by a drive 13 ~f the mechanism 11~ pitoh ~elive~
of the welded material 7 a~d a spri~g 14 to bri~g t~e p$tch ~eed mechani~m 11 to tho initial positio~.
machine comprises9 accordi~ to the inverltio~, a device for separatio~ OI a req~ired lerlgth of th~ welded material, which is compo~d a mecha~i~m 15 for stoppi~
the delivery o~ the welded material at the end OI its weld-ing to the workpiece 2. ~!he mec~Dis~ ~5 i~ mad~ a~ a hou~-~g 16 provided with a thro~gh openi~g ~or passage of th~
welded slaterial 7 a~d an ecce~t~ic 17 w~ich pivot a:~rle 18 is secursd o~ the part ~f the houæing located over the wel-ded material 7, the eece~rio 17 b~ ; rotat~d by an eleot-romag~et 19.
The device ~or sepæatiosl of a req~lired leligth of the welded materi~l 7 alæo compri~es a ~elding end pick~p 20 (~ig. 2) made a~ limit ~witch 21 l~ ematicall~r co~nect~d to the table 1 b~ mean~ o~ a ~am 22 l?laced on said table 1 carry~g t~e workpi~c~ 2. ~he table 1 i~ mounted OII beari~
23 (Fig~ 1) for horizo~tal rotatio~. In ord~r to looate the mecha~i~m 15 (~i~s. 3) as clos~ to the zo~e B oiE cQ~act o~ the wel~ed n~aterial 7 with the workpiece ~ and the electrode~ 3 a~a 4 a~ possible, the hou~ of the mecha~ism 15 Ior st9pp:hg the delivery OI the welded material 7 i~ mad~ as tho ~}ide;
'~iUa~b 6 ~or IorcibJ~ keepin~; the welded material 7" as ~how~
in ~ig~ 3-~ he disclosed machine ~or pressur~ contact s0am weldillgope~ate~ as ~ollow~.
~ he workpiece 2 prepared ~or weldi~; is placed be~wee~
the electrodss 3 a~d 4 on the tablo 1 a~d prior to weld~
the welded material 7 is passed from th~ reel 1~ tbrou~;h the pitch Ieed mechanism 1~1 ~or deliver~y o~ th~ welded materi0.l 7" the mecha~i~m 15 for 5tioppiDg the delive~y of ~he welded mate-rial 7 a~d l;b~ough th~ slid~wa;y 6 for ~orcibl~y keeping the ~elded material 7 till the zone B of its c~ta¢t with the work~
pieoe 2 a~d the ele~trodes 3 and 4.
~ he machi~e is the~ switched on. ~he mechanlsm 11 ~0d~
the welded material by eccentric stop~ 12 moved b~ th~ e 13 to the zone B c~f eontact with th~ lHorkpie~e 2 and the el~ctrodes ~ aDd 4 and i8 r`~t~rned to the irlitial position by the ~pri~g 14.
~ rhe wcx~iece 2 al~d the weldad mat~rial 7 i~ ~ipped by the ele~trod~3 3 a~d 4 by mean~ o~ t~e driv~ 5. ~hen the rotation drive of th~ elsctrode 3 is ~itched o~ d the weld~g current is supplied.
I~ thi~ ¢ase the ~elde~ materi~l 7 is u~wou~d from t~
r~el 10 by the thrust aeveloped by the roller eleo.trode~ 3 and 4.

~ t the mome~t the welding e~ds, the cam 22 lgca~ed o~
the ta~le 'I act~ o;~ the ~eldi~g end pickup 20 which actuat-es the electroma~et 19 of t~e meGbani~m 15 for ~topp~g t~e deliver;sr o~ t~e welded mate ial 7., When t~e ele~romag-net 19 is ~wil;c~ed on, the ec¢entric 't7 rotates about th~
18 s~cured or~ the housi~g 1~" pre~ses t~ welded mate-rial to the housi~ 16 a~d 8top~ ~ts delivery~
W~on t~ ~elded material 7 i~ stopped, it is r~ptu~d i~ the zone B, becau~ thi~ place the welded material 7 i~ heated by th~ ~7eldi~g curro~t and ha~ the ~ako~t ~ect~n.
~ s the welded~ material 7 i8 tor~ OII~ the wel~g i~ ~
di~contiued; the rea~ workpioce i8 rem~ed alld a llew work-pi~oe 2 i~ p~t in it~ place.
Further o~ the cycles are repoated.
~ h~ alD~ve de~cribed peculiaritie~ o~ the de~ign o~
machill~ for pressur~ co~act ~e~m weldi~g m~e it possible to employ such a machi~e ~or maRs p~odu¢tion o~ wo~ eces Soguiring weldi~g o~ a do~i~ite leDgt~ of a ~rip material or wire or similar onos.
Th~ olalmed machi~e i~ s~fective for pras~ure co~tact ¢laddi~ ~ith rçsistarce-pro~ ~trips (solid and pouder) o~ :
workpisoes having portio~ s~ba~cted to ~igh ~to~ity ~ea-~g.
Cladding by p~!OB~Ure co~tact ~eldd~g ~as u~ed ~or ma~ufac-turirlg di8k blados of beet harvester~ a~d high quality workpiea~.
, . .
ha~e b~eD produced. Com~?axison stud~e~ o~ th~ k blade~

;8355 produced ~n the disclosecL machi~e dem~strated better operatio~-al charact~ristics a~ ~ppos~d to those ma~ actured by oth-er methods.
Similar reæults ha~e besn obtained ~ strengtheniDg .
dis}~ harro~ a~tuatiIIg Or65~1B with resista~c~-p~oQ~ ~rips, which havo been test~d i~ oonditio~s o~ hi~;h abrasior~ g.
~ hi~ in~re~tio~ ca~ be ~læo 8ucco~;s~ull;y employed to p~o~ide ma~hines ~or wel~IIg plastl~ woxl~pie~sæ where wsld-~g o~ ~various ætrip ma*~ials is reguir0~.

Claims (5)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A machine for pressure contact seam welding comprising:
a table carrying a workpiece; electrodes located opposite each other and electrically connected to each other; at least one of said electrodes is mounted so that it can be brought to-gether with the other electrode to produce an elastic static for-ce in the welding zone; a reel of the welded material; a pitch feed mechanism to deliver the welded material from said reel into the zone where it is gripped together with the workpiece by said electrodes; a slideway for forcibly keeping the welded material in the zone of contact with the workpiece and said electrodes; a device for separation of a required length of the welded material, comprising a mechanism for stopping the delivery of the welded material after the welding of the latter to the workpiece ends, a welding end pickup controlling said mechanism for stopping the delivery of the welded material.

2. A machine for pressure contact seam welding as claimed in Claim 1, wherein the mechanism for stopping the delivery of the welded material is made as a clamp comprising a housing provided with a through opening for passage of the welded material and an eccentric which pivot axle is secured on the part of the housing located over the welded material and which is rotated by an electromagnet electrically connected to the welding end pickup.

3. A machine for pressure contact seam welding as claimed in Claim 1, wherein the welding end pickup is made as a limit switch kinematically connected to the table carrying the work-piece.

4. A machine for pressure contact seam welding as claimed in Claim 3, wherein the kinematic connection of the limit switch with the table is made as cams placed on said table carrying the workpiece.

5. A machine for pressure contact seam welding as claimed in Claim 2, wherein the housing of the welding material clamp is the slideway for forcibly keeping the welded ma-terial in the zone of contact with the workpiece and the electrodes.