DE6913974U - DEVICE FOR WELDING, IN PARTICULAR ARC WELDING OF COATED AND UNCOATED METAL PARTS. - Google Patents

Description

7.3.74 Subject: Bu, -re.

German utility model registration G 69 139 74.8 Änm .: Dr. Becker

New introduction to the description

The innovation relates to a device for electrical joint welding of metal parts during welding are pressed together and relates in particular to the welding together of workpieces, that is, sheets or metal bodies or metal parts with very different metal thicknesses. When welding such parts together, there is also a different electrical resistance, which creates difficulties for the achievement of the welding temperature required for both parts are conditional.

Thus, with the known devices and the known design of the welds, there is often only a poor connection brought about because the thin sheet metal part is overheated and the metal flows away under the formation of holes, without welding to the thicker sheet metal part.

_fö . Often small sheet metal parts, e.g.

Brackets are welded on in order to be able to arrange apparatus, devices or the like. However, the outer Any existing decorative layer is not damaged, and different metals often have to be electrically welded together.

The task of the innovation is to avoid these difficulties.

This is achieved in particular in that a device for electrical joint welding, which are pressed together during welding, is created, according to the proposal of the innovation, the facing inner sides of the Metal parts at a distance suitable for arc ignition

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are arranged and one pole of the welding device with a side wall that is not visible after welding, e.g. a bare side wall connected is.

But if resistance welding is to be used, »so will according to a further proposal of the innovation arranged in the cavity contact-forming spacers.

The innovation also relates in particular to the welding together of coated metal parts, their coating is removed from the area of the welding point before welding, with the stripping area serving as a welding cavity for arc welding.

In this way, and with the help of inserted spacers, perfect welded connections can be made with the usual welding machines Sheets made of steel, chrome-nickel steel, aluminum or other coated with plastic lacquer or other substances However, the outer layers of the welded sheets are decoated as a result of the action of heat or destroyed by melting under the electrode. To avoid these disadvantages, the innovation suggests a Pole of the welding current via an electrode to a stripping point, E.g. bare side edge, to be connected directly with a sheet metal coated on both sides, while this point is for the purpose of pre-worming indirectly through a cable, as well as for welding is indirectly connected to an opposite pole by another cable with a sheet metal coated on both sides to be welded on.

In particular, by connecting one to one after dom Welding areas that are no longer visible, the advantage is achieved that the outer layer of at least one sheet remains intact. while the weld as an internal weld of each other

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opposite sheet metal surfaces is carried out.

According to a further exemplary embodiment of the innovation, one pole of the welding current is connected to an electrode via an electrode Stripping point of a sheet metal coated on both sides and with the other pole to a second stripping point of the sheet metal directly connected by a parallel electrode for the purpose of preheating, while a second to be welded on (left in the drawing) sheet metal coated on both sides via a cable and a regulating resistor on the electrode is connected and a third (in the drawing on the right) sheet metal coated on both sides by a cable via a Regulating resistor is in communication with the electrode for the purpose of welding.

It is useful to place the bottom sheet on a cooling plate to arrange.

When switching on, current first flows from the upper electrode through the upper sheet to the lower electrode, which heats the sheet and the layers between the sheets melts.

Under the pressure of the upper electrode, the heated upper sheet bends and comes into contact with the lower sheet. The current now also flows through the lower sheet to the lower electrode and welds the sheets in the process.

Furthermore, the innovation proposes to design the device so that the heating of the upper sheet is only on a small area is limited.

This is achieved in that, according to the proposal of the innovation, one pole is overlaid at a point that has been stripped of the coating an inner electrode (5) is directly connected to a sheet metal coated on both sides and for preheating with a

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is connected concentrically to the first electrode arranged ring electrode, while a second to be welded for welding sheet metal coated on both sides is connected to the other pole via a cable.

When switching on, a heat flow initially flows horizontally between the electrodes, after the layers have melted, a welding current perpendicularly through the two sheets and welded these.

For roller welding, the upper sheet is covered with a strip-shaped Stripping zone provided for the roller electrode and between the sheets coated on both sides along the A wire inserted into the weld seam. Both sheets are connected to the opposite pole by a wire. When switched on flows in Worssestross wanders through the upper sheet metal to the inner one Layers have melted. The wire then makes contact between the sheets, which also causes welding current to flow and welded the wire to the metal sheets. In addition, the wire can be connected to the opposite pole.

According to the innovation, this embodiment is designed so that the one pole with the roller electrode, which is arranged at a stripping point, coated on both sides with a Sheet metal directly connected and indirectly from the sheet metal via a cable for preheating, and indirectly via a cable for welding Cable is connected to the Gegebpol by a sheet metal coated on both sides to be welded, while between the holed ones A wire is arranged at the seam to form contact.

But it is also possible to use both sheets indirectly with the poles to connect a secondary circuit, put between cooling plates and press together.

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By inserting several wires, which can also be laid crosswise, it is possible to produce many with one print Manufacture weld seams. The outsides remain intact and it can be used for support and improvement upper and lower vibrators are used during the welding process. A heat current flows after switching on and a welding current after the layers have melted According to the innovation, such devices are designed as follows:

The pole of the secondary circuit is indirect with a sheet metal coated on both sides over a cable and the opposite pole indirectly Connected via another cable to a sheet metal coated on both sides, while between the coating of the two sheets To form contact at the welds, wires, preferably with an angular profile, are inserted, which are attached to one pole of the Are connected to the secondary circuit.

In a variant, one pole of a secondary circuit is indirect with a sheet metal coated on both sides via a cable and the opposite pole indirectly via a cable with a two-sided coated kefi Sheet metal connected while between the coating of the "fBleche to form contact on the welds, wires, preferably with an angular profile, are inserted, the wires at one pole of the secondary circuit are connected.

In the other embodiment, one pole of a secondary circuit S is indirectly via a cable with a double-sided coated one sheet metal and connected with wires lying on the layer, while the opposite pole indirectly via a cable to a double-sided coated one Sheet metal is connected to transverse wires lying under the layer on the wires.

The angled ends of metal sheets, e.g. of room partitions, can also be welded according to the same principle.

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For this purpose, the internal welding points have to be stripped
to attach, insert weldments there and connect each sheet to a pole of a secondary circuit
Stromes and the pressure device weld the sheets
intact outer layers.

According to the innovation, the device required for this consists in that one pole of a secondary circuit is indirectly via a cable
connected to a two-sided coated angled sheet metal at the end and the other pole via a cable with regulating resistor with a two-sided coated in the U-shaped
Sheet metal, engaging sheet metal is connected and at the welding point the sheet metal is provided with internal stripping and the sheet metal has stripping zones into which welded pieces are inserted
are.

The device according to the innovation also makes it possible, in particular, to use the capacitor pulse welding process, in which capacitor plates are arranged above and below the welding point. According to the innovation, the method can also be carried out thereby
be that for the internal welding of two sheets coated on both sides at the welding point, a cavity with bare sheet metal points for igniting an arc is arranged.

The effect of the device is significantly improved by evacuating the welding cavities with the evacuation devices with which these are associated.

According to the innovation, such a connection is designed so that
a housing is used, for example a bell, which seals the welding point, including the necessary welding devices, airtight from the environment and means for evacuating the
Has housing cavity.

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In particular, such a cavity in the present

In the case of electrical welding devices and pressure devices, e.g. yokes, as they are from stud welding as Welding guns are known. The vacuum bell jar can have suitable means for its arrangement inside, e.g. in connection with the pressure-resistant means. In particular, such means should also allow the arrangement of moving parts e.g. Electrodes or plungers are used.

According to the innovation, the hand-held device is arranged within a bell with a vacuum seal over a valve and the Vacuum bell jar with an elastic seal placed on a sheet metal over the welding point.

The evacuation device can be of any shape, size, and any type required for electrical welding, for example Record devices, machines and means. So far to the outside, e.g. Schlater and the like. Or means for Adjustments are required, these are to be arranged airtight to maintain the vacuum or negative pressure in the bell. It is possible for the average person skilled in the art to always design this shape of the bell and its seal in such a way that both the required welding equipment as well as the welding points are reliably under the required vacuum during operation, adhesive strips or other sealants can also be used.

In special cases , openings or bores leading to the welding cavities can also be arranged in order to evacuate the welding cavities.

The main advantage of using vacuum welding is that the surface is heated and melted without it the warmth penetrates deep. Precisely because of this, it is possible to use even extremely thin metal sheets with highly sensitive outer decorative strips through pure security against each other and against each other =

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press through electrodes or pressure stamp inlt 'the other To weld the surface without damaging the outer decorative layer.

In contrast to resistance welding, metal parts can be of any different thickness, including an arc be welded, as it is only a question of the required heating of the surfaces and the optimal welding temperature. Furthermore, much larger areas can also be used than come into contact with the formation of a weld nugget. These arc welds are the resistance weld generally considerably superior. Even very large areas can be achieved by dividing them appropriately into arc areas be connected to each other.

In addition, in a vacuum, especially with ionizing air, there is no need for any ignition means, or any special means to reduce the distance and the like, because a current, in particular a capacitor discharge current of sufficient energy via electrodes or other contact points, the sheet metal parts and the insulation of those not to be closed is sufficient Feed contact surfaces to the welding cavities in order to form the arcs there, to melt the welding surfaces and then to press the welding surfaces against one another at the optimal point in time of the melting and thus to weld them. To actuate dex spring-loaded electrodes or plunger known at the time controller can be used. It is also possible, in the manner of welding guns, to trigger the live electrodes or pressure stamps automatically in a known manner by the welding current.

The use of such automatic means can be dispensable, if calibrated pins or tenons or the like inserted by the melting process, the duration of the optimal welding of the welding surfaces is brought into harmony with their melting away and the Electrode or the pressure stamp with constant exertion of a welding pressure against the welding surfaces during the melting

presses each other and unites with each other in a liquid state. It can be advantageous to introduce ionizing agents into the welding cavity, e.g. metal powder with which the Arcing is favored and thus the welding takes place in the shortest possible time. Yes, according to the particularity of the individual In a specific case, the use of one or the other method is more advantageous =

It should also be pointed out that the device, according to the innovation, also enables the surface welding of different metals alloys are created whose properties are decisive for the welded joint. The calibrated Welding spacers of such alloys are used, which enable optimal bonding on both welding surfaces. It is also possible, for example, to insert welding inserts into the openings that are used for evacuation, with e.g. One of these can be welded on and the remaining part remains, e.g. for attaching other parts thus two combinations in one operation.

<Basically all parts are not welded

should, but touch, to isolate airtight from each other

e.g. by insulating foils that are preferably adhesive on both sides,

Paper inserts or only layers of adhesive Due to the high contact pressure, the edge seals e.g. with Overlaps or if both sheet metal parts or the like. Full the An airtight seal is subject to pressure from the edge seals

causes.

Any type of current suitable for the individual case can be used as the welding current, e.g. alternating currents with or without Rectifier; Capacitor discharge currents are particularly suitable for this purpose.

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According to a known method of stud welding, the welding stud is pushed up to an adjustable distance known to the welding point. After the innovation, the electrode is adjustable, either at a certain distance from the upper one outer welding point arranged with releasable bias voltage or the electrode with spring loading on the welding point put on before the current is introduced. In the latter case it is also possible to proceed in such a way that a timer or a correspondingly calibrated insert or pin or tenon at the time of optimal melting of the opposing ones Welding areas a strut «, which is triggered and thus the required welding back in the final stage on the welding point is exercised.

With another device the stud welding is over the instant the introduction of the welding current of the studs from the welding point lifted off, ignited the arc and welded the bolt back on. After the innovation, the lifting can be done E.g. smaller sheet metal parts can be made in the same way, for which the corresponding frames of the corresponding object size can be lifted with the Electrodes are provided that lift the welding part to be lifted in a precise position parallel to the welding surface of the counter plate and press on again.

Also, the seam welding may be with the arc method according to the innovation of the example linear kanalfcrmigen welding hollow space erfolgen.Dazu openings can to a evacuating out at the top 'for example, and existing at the beginning and end of the channel-shaped cavity openings * bores be provided to the welding cavity out previously in be closed in any way or these start and end openings are brought into connection with the evacuation device and thus the welding cavity is evacuated.

Metro _n terschied by seam welding enables innovation

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with regard to the welding time of a few milliseconds the entire welding cavity by pressing after the arc melting at the same time by means of linear pressure punches to weld.

With the evacuation device, not only can all, for example, interconnected geeks be provided with evacuation openings Welds are evacuated at the same time, but instead means for the individual openings can be provided which, in conjunction with an evacuation device, enable the evacuation of each individual welding cavity.

The innovation allows for all concrete cases through combinations of the various means to be used and a corresponding one Determination of the welding data an optimal welded connection of the metal parts also to the cases, which so far outside any possibility of connection by welding.

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Various methods and devices required to carry them out are described with reference to the drawings. It shows

Fig. 1 in section and ie enlarged scale a welded part of two sheets coated on both sides with an intact outer layer with two indirect welding stream introductions and one direct through an electrode,

Fig. 2 two welded welding points of three sheets coated on both sides with two indirect Stroewinleitunyeit and two direct by two parallel electrodes,

Fig. 3 shows a welded point of two coated on both sides Sheet metal bit indirect and direct strobe by an inner and an outer electrode,

4 shows in cross section a prepared visual weld seam for two Sheet metal coated on both sides, separated by a welding wire, with indirect power supply and r- dlrekt «B through a sehweiSrolie * ·.

Fig. 5 i "Longitudinal section of a prepared weld seam for two sheets coated on both sides" with applied welding wire, old indirect strokes and? «One di rectly through a welding roll,

Fig. 6 is a section of a prepared seam weld for two

two-sided sheets separated by wire with indirect Strsa introductions, framed by a vibration dircg

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13 J / J Fig. 7 ia cut a prepared seam weld for two
Coated on both sides by crossing wires
separate sheets old indirect strobe discharges, Fig. 8 echoubildiich a welding wire old hourglass-fBraigea
Cross section, } j Fig. 9 ait triangular Braigea cross section, Fig. 10 ia cut a prepared weld for a
U-frame and an angle that engages in it
two sheet metal coated on the side with welding \
between pieces and indirect strobe introduction, Fig.11 ia cut a prepared · welding point of two
sheet metal coated on both sides with welding brackets
• does and indirectly · * Stroaeir.leituoa. eifwjefosst from
Condenser plates. j Fi _f. 12 la cut a more preparatory weld for two
sheets coated on both sides, with the lower sheet
on the inside a pigtail of visible white 1
Fig. 13 ia cut a prepared sweat »-t * ll · for two
Sheet metal coated on both sides with on-welded sweat
tap νηά between a weld intermediate piece, Fig. U ia cut a prepared weld for two
sheets coated on both sides with finishes and
Welding adapter, 6913974 04/17/75

Fig. W ! ■ Section of a prepared welding point for two sheets coated on both sides with right-angled profiles and round welding joints,

16 shows in section a prepared welding point for two

sheet metal coated on both sides with triangular cutouts, round white dividers and a Stroaelfileltungseinrichtung,

17 shows in section a prepared weld for two

coated on both sides ·· sheet metal, the top sheet ■ with an outer opening and one facing downwards pointed tip and the lower sheet is cooled at the welding point,

Fig. IfI ie section of a prepared welding point with easy-melting * welding pieces,

Fig. 15 * a variant bit milled on welding spigot, Fig. 20 is a section of a prepared weld for two

coated on both sides «» sheet metal with inner stripping »

Fig. 21 in. View of a decoated area with a circular shape

Ribs,

22 shows a welding divider with ribs on both sides, Fig. 23 a weld between the two sides with ribs, Fig. 24 a stripe-like construction is with ribs,

25 is a cross-section of a prepared welding point with a pointed expression under the U9X electrode,

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Fig. 26 "in" prepared welding point is a "welding intermediate piece, which still has points pointing downwards at the top,

27 of the visual knowledge intermediate piece in view,

Fig. 28 a prepared welding point with inserted « Fucking pen,

Fig »29 a variant» it can be pushed back »· * Schweiasiifi, 30 shows, in section, a prepared weld for two

Hetoll sheets coated on one side with insulating insert and welding pieces,

Fig. 31 a coating strip with glued-on welding threat,

32 shows in section a prepared welding point e; Lt attached welding device,

Fig. 33 The section of a prepared welding point for a lower sheet metal with welding pieces held on the welding device and

Fig. 34 "Upper welded intermediate pieces to be welded on" Sheet,

Fig. 35 in section a prepared welding point "with a" welding pin to be "welded in,

36 in section a prepared welding point for two sheets coated on both sides with a current displacement device through capacitor plates and foil with attached «welding device,

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Fig. 37 i “Section of a prepared Sc'mreiGstalls sat evf- ScnveiBgeröt us

Fig. 38 a prepared welding point is attached Welding machine within a vacuum bell,

39 shows a prepared weld for welding With the help of a welded-on lifting bolt υηιίι a stud welding device,

Sheet 2 with an upper layer 2a and a lower layer

2t? is to be welded. In ά% τ welding to a AuSensehicht, namely, the lower layer 2b of the sheet 2 remain unharmed by 'has the Siech 1 to SchweiBstel-Ie to a "Entschic.htung Ic, so that an upper electrode 5 contact with the sheet 1 acknowledged. The metal sheets 1 and 2 are connected to a lower counter electrode 6 by cables 7a, 7. The lower layer 2b lies on a cooling plate 10 and this over an insulation 12 on the flat counter-electrode 6. When switched on, current flows from the upper electrode 5 through the sheet 1 and the cable 7a to the counter-electrode 6. Do & sheet 1 protrudes under the upper electrode 5, the two inner layers 1b, 2a melt, contact is made with sheet metal 2, the current flows through sheet metal 2 and cable 7 to counter electrode 6 and pre-welds the two sheets under the pressure above Electrode. The welding data are set and controlled so that the lower layer 2b does not melt on the decorative side. Even if the welding point cools down, the layer is not changed,

If it is placed on a cooling plate 10, which "has a" Insulation 12 rests on the counter electrode 6.

FIG. 2 shows, in a further example, standing electrodes. Doait may include an upper Siech 1 "it de · layers Ia ₉ Ib" it two lower sheets 2 and 3 old layers 2a, b or "3a _f b are equal to each other connected · The upper Siech 1 has under" he right electrode 5 and of the left electrode 6 coating layers on the lower sheet metal lie on a cooling plate 10 which is mounted on a table 11. A cable 4 leads from the right electrode 5 to the left sheet metal 2 and from the electrode 6 a cable 7 leads to the right sheet metal 3, a regulating resistor 8 being connected in each cable. When switched on, a current flows from the electrode 5 through the sheet metal 1 to the counter-electrode 6. The sheet metal is heated at the welding points, the layers Ib, 2a or Ib, 3a are hot-melted. There is contact to the sheets 2 and 3. A part of the stitch now flows from the right electrode 5 over the sheets 1, 3 and the cable 7 to the counter electrode 6 or over the cable 4, the sheets 2, 1 to Counter electrode 6 and welds the two sheets at the same time at both points. The layers 2b, 3b lying on the cooling plate remain unharmed.

According to Fig. 3, the swelling has been known to you since a ring Counterelectrode vogsno — e. An upper tray 1 sit the Layers la, Ib often have a somewhat larger weld point Decoating Ic ouf. The lower sheet 2 old the splint 2a, 2b Runs e «f a KUhlpleit® 10 euf, vslehe over one insulation is mounted on a table 11. The inner electrode 5 is vew

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• In the outer ring-shaped counterelectrode 6 ussebmt. Both electrodes touch the sheet 1 within the Enttehichtung Ic :. The inner electrode 5 is connected by a cable 4 "it de" a FoI and the outer electrode 6 by a cable 7a or the "opposite pole of a secondary circuit S of the welding system. In addition," the lower sheet metal 2 is connected with a cable 7 to the opposite pole connected. In "switch-on a Stro" flows from the inner electrode 5 through the plate 1 for BUSSER * n counter electrode 5, the sheet I is or ά "ζ weld enterst, melt the layers Ib, 2a, there is formed contact of Siech 1 to" sheet 2, the current now flows from the electrode 5 over the metal sheets 1, 2 and the cable 7 back and the two metal sheets are welded together. The layer 2b lying on the cooling plate remains unharmed.

The process can also be used for roller seam welding. According to FIG. 4, an upper sheet 1 "with the layers 1 a 1" is provided with a stripe-like decoating 1 c. A lower plate 2, "it the layers 2a '2b is located on a Kuhlplatte 10 tmd insulation 12 · · between the organic layers or chen Ib, 2a, a wire 9 is stretched to facilitate contact formation to d% z weld. A welding roll 5a protrudes over «in cable 4« with one pole of a nS - customer circle S of a welding system

those pole through a cable 7, "it your sheet 2 through a cable 7a

'' »It is connected to sheet metal 1. B * ia switch on flows «in

Stro «over the cable 4, the welding roller 5u, the sheet metal 1 to the cable 7a, the sheet metal 1 is heated, the layer Ib is cut.

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The wire 9 gets in contact, a layer 2c _{for the} wire melts in contact with sheet 2, the wire flows over sheet 2 and the cable 7 and welds the wire to the two sheets, The view 2b lying on the cooling plate remains deb "! unharmed "

The wire 9 can also know the cable 4 or its ends be connected to cables 4 and 7 with opposite polarity.

It can also be welded without removing the coating. For this purpose, according to FIG. 5, an upper sheet 1 with layers 1 a, 1 b lies directly on a “lower sheet 2” with layers 2 a, 2 b, lying on a cooling plate 10 and supported by insulation 12 on a table 11 . A wire 9 is stretched under the welding roller 5a and over the layer. The secondary circuit S of the welding system "is with a" pole over the cable 4 with the Sehweißrollc "and" it the other pole over the cable Z with <£ e "sheet 2, over the cable 7a with the" BlWn 1 wnd over 4oz Ksbil Tb connected to on * wire 9 . Regulating resistors δ are switched on in the cables Z ″, 7a, Tb. When switched on, a current flows from the welding roller 5a over the wire 9 and the cable Tb, the wire 9 is heated, the layer la snaps, the wire 9 gets in contact with sheet metal 1 as well as with cable 7a and melts itself, whereby layers 1b, 2a also melt and the welding of sheet metal 1 and 2 takes place via cable 7. Layer 2b lying on cooling plate 10 remains undamaged.

Both outsiders are familiar with yet another process

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of the sheets remain unharmed and at the same time a larger one Number of welds are made.

According to Fig, 6 are it between a · upper plate 1 'the layers 1a, Ib, and a lower sheet 2 "it the layers 2o, 2b threatens · 9a tensioned parallel over the upper sheet \ and de" lower sheet 2] e a cooling plate 10 is arranged. The "cooling plate" can be followed by a vibration device, which consists of electromagnets 14 and the magnets connecting head and foot plates 15 become »The voter · lies on table 11. The upper device is ait The help of piston 16 and compressed air cylinder 17 against the lower device! compressible. The secondary circuit S of a welding device is old a Poi through a cable 7 to the lower sheet metal slt d "= ssdsrsri pal dsrsh" in cable 4 to de "above" Siech

connected "The wires 9a are" at one end "with one pole each of the secondary circuit. During welding, compressed air must be let into the cylinders 17 and the switch for the megnet 14 switched on. The vibration of the parts to be welded facilitates the penetration of the layers and accelerates the welding of the parts by preventing the transition. Bite turning on the ski "EI3 $ tro" It will heat the wires 9a, they melt the adjacent layers Ib YND 2s, bekossen IContekt »it the Bl # ch * n 1 and and verscfeeißen old them under de · pressure of the cylinder M ^ The Both / Uissensehichten Ic and 2b remain intact.

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7 shows the same arrangement. Below an upper vibration device 13 with a magnetic plate 15 and a cooling plate 10 lies an upper sheet 1 with layers 2a, 2b and on a lower vibration apparatus a lower sheet with layers 2a, 2b. above the layer 2s U # fi a series of turns 9a and below the layer Ib a series of threats 9b which cross the lower wires 9a. Instead of a series of twisted wires, an all wire 9a overdecede “sheet 9c provided” can be made bare or coated on the side on the threatened side and then circular welded points. is stripped in strips. The wires 9e are connected to the other pole of a secondary circuit S via a cable 4a or one pole, the rotator 9b or the sheet 9c via a cable 7a. Furthermore, the upper plate 1 is connected to the cable 4 and the plate 2 is connected to the cable 7, that is to say with opposite polarity to the adjacent wires. With "Ei! * Mfeeli" B ά "% welding cones, first the wires melt, starting from the crossing points, then the layers Ib, 2a along the dr & titcn, finally kmma -U sheets \ _f 2 mtmx 4m pressure of the liquor " \ 5 in contact The outer layers la, 2b remain intact =

Instead of the drawn Runddrtfht * also know «ekerfkoRti§ profiled wires were used

It shows a fin, three-inch wire bit with an hourglass-shaped cross section and FIG. 9 shows a triangular cross-section Ie further vttr $ r8 * Larger scale · It can also be circular or strelfenfer Decoating is arranged at the welding points or lines

From there, visual intermediate pieces in the form of wires or pieces of wire can be inserted.

Fig. 10 shows an example of angled metal sheets, for example in front of partition walls. A sheet metal 1 with the layers Ia ₁ Ib let on an "end u" 180 bent. Prior to the bending sichtipten welds are at the beab * in the layer Ib Entschichtungen ₄ Id Id "in circular or strip? Or" attached "Xn the bow engages a Abvinkeiung a metal sheet 2 with the Schicht®" 2a, 2b "On the Angled, stripping 2c or 2d are attached to the welds.

In the oboren Entschichtungen Id, 2c and in the lower Entschichtungen 2d, Id 'are SchveißstUcke 20 in discs - or * Strip "or inserted wire shape, whose thickness is greater for contact formation than the thicker of two layers äes" The bow Syllabic 1 is Ub "r Hm KUhlpiätts 10 on your table _? while the top of the sheet 1 is covered by a further carbon plotting and can be pressed down by a pressure plate 15, piston 10 and pressure cylinder. resistance 8 sn the & td & x & n pole of a secondary circuit S of a weld. When the strobe is switched on, the sheets 1 \ tnä 2 are welded with a®t * weldments 20. The external look remains? Sheet 1 intact *

Another method for maintaining an uninjured outdoor IU A sheet metal 1 sit the layers le, Ib

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"Oil sit a Siech 2 ait the layers 2α, b are welded * For this purpose -" the opposite layers Ib and 2a stripping Id, 2c, in which a welding piece 20 is inserted in wire form · On the outside of the sheets 1, 2 are placed above a Koncensatorpatte 3la and below a condenser plate 21b , which Ubsr its insulation \ 2 rests on a table M , while the upper over an insulation 12 sits a pressure plate 15 sneezes. is «pie» here capacitor plate is »it« linem pole el? ier source of direct current and the lower one is connected to the »other pole« other"! ^ With poles of the upper capacitor "31" it de "pole of the plate" 1 are gleichna "ig _# as well as the lower Koiidensatorplatte with the Blechet 2 · Are charging the capacitor plates and the Schweiße'trc turned on the end of a welding Connected 31b * so hr capacitor plates, the electric field <urges the Sefweißstrots of the Außensehichten inwardly toward the weld db out what the weld speeds, reduces the heating and the Dekoraußsnschicht Ie abhtHit "IDID Dekoraußemseite remains intact even with thin plates and thinner ISeschlchtung"

The capacitor plates can also be designed as cooling lines. You can eiiner curved welding points ^ ix series! -Line he adapted and _f be xusaapreßbar by pistons and Djrwcklwitzyliiider see Fig. 6 also showed there "vibration device label attached additionally be"

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AS 1

The process can be carried out for non-ferrous metal sheets with oxide layers or bonded steel sheets, the outsides of which should remain undamaged. The mathematical desiccation of the welds removes oxide layers that require a temperature of 5000 for melting, and special layers. Inlays made of the same metal or specially suitable alloys are to be inserted into the cavities, which quickly weld the bare welds with little heat generation «

In order to limit the heating of the sheet metal to a small area, to recover the contact resistance at the welding point and to be able to use short welding times, the contact areas at the welding point are extremely reduced enlarged representation in Fig. 12 is an upper sheet 1 with the layers 1a, Ib on the outside with a small stripping Ic, on the inside with a stripping Id and a lower sheet 2 with the layers 2a, 2b not only with a stripping, but also provided a bit oiner recess 2f in sheet metal, which reduces the contact area at the ό ^ τ welding surface to a very small welding point 2g. A ring milling cutter digs out an annular groove 2f and leaves the cylindrical welding pin 2g. The lower sheet 2 is supported by a cooling plate 10 on a table 11, while the sheet 1 is held by an upper cooling plate 10 with a recess for an electrode 5 by a piston 16 and a pressure cylinder 17 * The electrode 5 is a small one Tungsten

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as

& is or. tin "Pel sines $" fcyndärkreis "S of a SehwelSonloee, preferably a condenser diweiSonlpge, closed * while the other pole is connected to the sheet 2 iifc. 5b B "is" fwivmiteii the current touched ei © small area of the Wolf reaspitze the sheet 1. Under de · Pressure OCE electret 5 kisses the Bisch 1 sit ass Scisisss Ssh ^ ^ 2s iBsspf in SerOhrtmg and welded old him "Ri * Außesechicht 2b \ des Siechet »2 remains intact and the outside Io of the sheet 1 can only be re-coated in a small area. -

According to a second example in FIG. 13, the sheet metal 1 is old, the layers 1c, 1h and the layer 2 old the layers 2o,! \ 2b me on the inside alt 3 · a cutout If _t 2f for \

Formation of a welding spigot Ig, 2g to provide * and zvi- j \\ see the weld spigot a weld spigot 20 inserted- · ₍ '* _r whose thickness is greater than the "he distant viewpoints. The under · sheet 2 overlies min · cooling plate 10 \ \ a table Π ouf, Wehrend the upper plate 1 via an upper \ 'v cooling disk # 0 by piston 16 and pressure cylinder 17 low-' .. \ is printable. the sheet 1 is connected by "in cable 4 old de" a ν \ pole of the secondary circuit S of a welding log and the sheet metal 2 i \ \ by a cable 7 old the other pole - j ^x just the weld spigot Ig, 2g flow ", which quickly / wilt and weld under the pressure of the cylinder 17 old less heat development. The outer layers la, 2b remain undamaged. ·. \

A third example in Fig. 14 is the upper sheet 1 \

"Vt"

/ J

With the layers le, Ib at the top there is an external recess If corresponding to the electrode shape and at the bottom there is payment Id and the sheet metal 2 is provided with a conical shape milling section 2f, which forms a welding point Zg. Between the sheets a welding intermediate piece 20 is inserted, which has a pin 20a or air "ring cutting edge" to reduce the contact surface prints a! When scolded, the straw can flow through small contact surfaces, which heat up quickly and weld. Layer 2b of the lower sheet remains intact while doing so «

According to a fourth example in FIG. 15, the sheet metal 1 is with the layers la, Ib and the sheet 2 sit the layers 2a, 2b only on the inner sides one each with a rectangular cross-section Equipment If, 2f provided and in the erosions Visible intermediate piece 20 inserted in a ball * or wire shape, whose diameter is greater than the milling depth and that only Has point or »line contact with the milled areas. The sheet metal 2 rests on a table 11 via a cooling plate 10, while the sheet metal 1 passes through an upper cooling plate 10 a piston 16 and a pressure cylinder 17 can be pressed down. Dos sheet t is through a cable 4 with one pole of a Sokundärkroises and the Siech 2 through a cable 7 with the amtaren pole connected. When switched on, the electricity

6913974 04.17.75

"Ρ vnkte bxw" -lines flow over the touch, which are ochnell βχναπ * »η and weld. Di · external loops la and J2b remains unscathed.

Up a fifth example in Fig. 16 i * t of the sheet 1 "it aen layer" 1ci, Ib tmd the sheet 2 old the layer * 2e _f 2b on the inside of bit strips required decoating ducts Id, 2c within the decoating unit with a small one , i · Cross-section of a triangular cutout. g If, 2f provided and in the itus bevels a whitewash inserted in a wire, the diameter of which is greater than the depth of the openings. The sheet metal 2 rests on its left end over a cooling plate 10, an insulation 12 on the lower electrode 6 of a SchwiiiSonloae, while the upper sheet 1 with its right end overlaps the lower sheet and over an upper cooling plate 10 an insulation 12 shower the upper electrode 5 ·? S ^ hwtfiBsnisv «nisdsrprsSber is. The "Bische" jssds "fs by upper and lower" Psare of piston 16 and pressure cylinder? "17 held in her box. The electrodes 5, 6 are each connected by a cable 4 or 7 to a power line device 24 for the outer cut edges Is, 2s of the metal sheets at mines strip 24 e is attached from Gutmi sit and retainers 24d, for example, resilient straps, at the edge of the sheets is cufhängbar 1.2. The strips 24c can be pressed against the cut edges by pistons 16 and pressure cylinders 17. The lungs of the device depend on the current to be transmitted. When the device is switched on, the current overflows

6913974 i7.ot75

■ Tr

di · Kobe! 4, 7 in the sheet metal 1, 2 and over the contact lines a welding piece 20, which I quickly woke up and weld. Dobei, the outside views la, 2b remain un · "honored"

Another example of welding with little wax development, the lower decorative sheet is shown in FIG. 17. An upper heated sheet 1 with the layers To, Ib has a frosting If at the top, which prevents the sheet metal from forming. The center of the recess is provided with a pointed, still downwardly directed expression 11, which is produced by an electrode tip or in a separate working cycle by a steamer. In the lower sheet 2 "with the layers 2z, 2b, a cooling plate 10 with a recess 10c under the welding point is read. In the recess 10a a coolant supply pipe 10a and discharge tubes 10b, which also make a mx small, a slight gloss point forming acquisition 4 ± s ÄijSeasshieh Ά versleden vizd. Xn die AusfrSsuag If an electrode 5 engages with a bore 5e in which a point 3n is mounted in the spring-loaded electrode bolt 5 for the expression 11. The electrode and dfitr electrode bolts 5m are "connected" through a cable 4 at one pole of a safety circuit S of a welding system

the other pole is connected to the sheet metal 1 by a cable 7a via a regulator 8 and to the sheet metal 2 via a cable 7 via a further resistor 8. \ When switching on, all Stros are fed via electrode 5 and that

Sleeh 1, wherein the thin sheet 1 of ά · χ Ausfräsune he, "the layer Ib, and then the layer 2a

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melts. The expression 11 gets Kontofct ait sheet 2, the Current flows back through sheet 2 and welds sheet metal under the pressure of electrode 5 old sheet 1 · The tip 5n the spring-loaded egg-electrode pickling 5e is pressed into the electrode 5 * o the «in the eye-white» » ee arises when the decorative sheet heats up slightly. the Outer layer 2b remains intact.

A further reduction in the heating of the coated sheets is possible if the welded pieces are made of material whose melting point is below the melting point of the joint to be joined. The well-known hard and soft solders are used for sheet steel and light for aluminum sheets melting aluminum alloys in question.

The example in FIG. 18 shows a top sheet 1 with layers 1o * Ib above with mixmx stripping Ic and below with mimr stripping Id and a lower sheet 2 sit eefi

Schienten Za, Zb above with an ig «,

where the desizing are in the form of discs or strips. An intermediate piece 21 in the form of discs or strips made of a material whose melting point is lower than the melting point of the line 1 _# 2 is inserted into the cavity of the inner stripping. The lower sheet 2 is supported by a cooling plate 10 z " _s " us copper on an electrode 6 whether. In the stripping Tc of the upper plate 5 engages an upper electrode, a · the lower plate £ ft eösreh cable 7 with the lower electrode 6 is connected * When the current dos intermediate member 2 melts!

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and connects with the sick, according to which the straw is

;. is switched before the sheets to Schaeizteaperatur koe>

«Eil · The outer layer 2b of the lower sheet remains intact.

According to Fig. 19, the heating of the sheets is reduced and the

ι Transfer resistance at the contact surfaces increased. In addition

: are the sheet 1 with the layers la, Ib and the sheet 2

"With layers 2a, 2b on the inside" with milled holes If ₁ , 2f provided for the formation of small weld pins Ig, 2g. The «· finishes point to« spot welding ring form, »seam» »weld groovefor». Intermediate pieces 21, the peeling point of which is below the peeling point of the metal sheets, and to which flux is added, are inserted between the welding spigots

] are. The lower plate 2 is on a cooling plate 10

a table 11 trimmed. The upper plate 1 is upper one

upper cooling plate 10 by a piston 16 and a pressure cylinder 17 Niederpreßöar. The upper plate 1 is about a Ka

bel 4 eit 4ms sirön £ sl eiisss SskyftJärkrelsss S uad of sheet 2 connected to the other pole via a cable 7. Beita switching on, Stroo flows over the sheet metal 1 over the small welding spigots Ig. 2g give intermediate "stuck quickly melts into the sheet 2 _$ and the connection is established under dVm pressure of the piston before the Sieshe to melting temperature can. The outer layers la, 2b remain intact.

A further reduction in the welding time and with it the sheet metal wear can be seen through the use of a capacitor pulse

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schyeißonlaga achieve. For generating small arcs between the opposite enischichtriers sheet metal flaps κϋβββη they have a certain small distance or only very much have small points of contact or points.

The removal of the coating creates a cavity with a cavity of a fraction of a millimeter, which allows the formation of small arcs. In Seispiel dw of Fig. 20 an upper plate 1 is the old Iu layers, 1b lc on the top and bottom with EntSchichtungen, Id and a lower plate nit the layers 2a, 2b sit on top of a stripping 2c provided so that the sheet metal surfaces Ib and 2b are opposite each other at a small distance. The lower plate is supported on a table 11 via a cooling plate 10, while the upper plate looks under the pressure of an electrode 5. The electrode is connected by a cable 4 to one pole of a Kondonsatoriatpulseschweißanlage K, while the other pole is connected by a cable 7 on sheet 2 and by a cable 7a via • a regulating resistor 8 to the sheet 1 for additional heating. When the stream is switched on when there is sufficient voltage, arcs are created between bare sheet metal surfaces Ip, 2p, which melt these curses without thermal penetration. In the meantime, the upper surface Ip is pressed against the lower sheet metal surface 2p and in the final phase it is welded to it. The processes «take place in periods of milliseconds. The outer layer 2b of the sheet 2 remains intact.

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3%

The ScitweiEstroa shock requires a sufficient initial tension v® to bring about and maintain the nrföraeriich · i-iehtbögsnbilewii§. For metering the necessary optical welding energy, the capacitor battery has a corresponding capacity that can be varied by switching (energy generator).

Is it a Kondeneator-Iapuls-Schweiöeaechine With transfonized capacitor discharge, the secondary side of the Iftpulsransfozaators is, between whose pole the The welding point has to be developed with a sufficiently high voltage for the formation and maintenance of the electric arc.

As Koftaeneator welding machines are also suitable for the resistance arc method, in which the capacitor discharge is not transformed and which have long welded fabric cables υηέ a minimum of very large white circle. Since the total welding time mx is about eleventh millisecond for discharge currents, the depth of penetration of the goods is very small. In line with this, the deselected Is-coated decorative side of the workpiece is not changed from about 0. S s »sheet thickness * The electrode service life j

is almost unlimited * The welds are independent of the j

Brightly strong «.

The Sehwiißp0ra "eter, nu-Líìh SfeRnyos and Sehweißzeit can consistently provided min _o It should vary accordingly entapre · hetallort the circumstances of the individual case and that of another to verachweißoTsdert sheets that Stroastürke.

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42-

This is done by connecting or disconnecting the capacitance units of the capacitor battery and the welding energy sensors. Also bmi. der 1ηη «Γ« ι Höhiraye-LlchtbQcftR-SshHeiEy »* ftsch 4ss EffladtHE« bedsrf es QSRZ desist-r Hiadestsnsriis ^ Sstsäiv toB welding or to »sufficient melting of the opposing welding curses as well as to melting even inserted sweat.

Since the energy conversion is based on the process * is sweat If the arc is concentrated, the energy loss due to heat loss is extremely small compared to resistance welding. The visual welding takes place with a significantly lower energy expenditure than is the same case with »Resistance welding» the welding parameters and inserts or the like are not violated.

Between the »minimum charge for welding and the * The amount that is still possible without damaging the decor side is a tight margin.

For the welding, the electrode pressure or the pressure of an electroless contact means, if necessary, is also of importance the condenser welding stream e.g. over a cut edge or About a «elsewhere uncoated point to be welded Bleches de «focus is forwarded. The transition resistance between the two sheets to be joined must not be so reduced that a contact stream flow instead of one Welding arc arises.

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"Also the phone of the electrode work surface or the pressure

"Itt * l" can be important.

■ It is necessary to oppose each other in cavity

stripped welds until they are sufficiently welded by the arcs irt a distance that gradually decreases according to the progress of the welding, under pressure, e.g. by means of a spring . Approximately

at the end of the welding flow according to the specified welding time in the liquid surface state of the weld joints, the welding surfaces are then entered Pressing against each other combined · The necessary delay can

r can be achieved in different ways. Through inserts,

By crossing pieces of wire or fine wire mesh parts, this delay can be achieved up to the complete melting of the insert pieces in time coincidence with the time of the optional welding of the sheet metal surfaces by the arcing. This during a correspondingly appropriate electrode or contact pressure, for example by means of compressed air and additional electrode suspension.

The formation of arcs 24 for seam welding Lung ribs shown by the attachment of ribs ST on the delaminated bare Bleehflochen Ip, 2p promoted., In Fig. 21 are for spot welding circular ribs and in Kg * on the Blechflöche Ip represented by profile cutter in Decoating can be made. In the case of larger spacings of the sheet metal surfaces Ip, 2p, intermediate welded pieces 58 according to FIG. 22 can be in a Schoibsnformn and according to FIG. 23 in a strip shape

6913974 17.0U5 " ^A

⁵⁵ 'ζ'ο *

Manufacture of the correct Abefandes are inserted, which have ribs 58a on the front side and ribs 58b on the rear side.

For sheets with thicker layers, the distances between the bare sheet metal curls to be welded are to be reduced or to be bridged with pointed shapes Layers 2 ″, 2b at the top with a decoating 2c. The lower sheet is supported on a cooling plate 10 »Above the upper sheet at the welding point, a punch 46 with a point is attached, and by a spring» of the pressure element ζ.S. a spring or a piston 16 of a pressure cylinder can be pressed into the sheet metal 1, iso that a point 1h is formed in the sheet metal 1 and οin contact between the bare sheet metal surfaces Ip, 2p. The upper sheet metal t is connected to the other pole by a cable 4 sit diss einsn PqI eifier Kondsnsistsr = Ispulssehw * iS * insert K and the lower sheet metal 2 by a cable 7 sit * Arcs occur when the current is switched on. After melting, the surfaces Ip, 2p are welded under the pressure of the punch 46. The outer layers la, 2b remain intact »

For spot welding, the cross-section of the punch © 46 has a circular shape, for seam welding it has a leisienfojrm.

According to Fig. 26 the contact is made by welding spiked intermediate pieces "An upper plate I with the layers% a, Ib above with a Entschichtuna 1c and down with

6S13974 04/17/75

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a coating 1d and a lower sheet 2 "with the layers 2α, 2b provided with a coating 2c at the top. An intermediate welding piece 45 is inserted between the bare sheet metal surfaces Ip, 2p, which, for example, according to Flg. 27 cast a log 45 with alternately upwards and downwards pushed out tips 45a, 45b. Dos Siech 2 rests on a cooling plate 10, while the sheet metal 1 can be lowered by an electrode 5. The electrode is connected by a cable 4 to one pole of a capacitor Iepulscchweißaniage iC, while the other pole is connected to the sheet metal 2 by a cable 7 and the sheet metal 1 via a cable Ta via a regulating resistor 3 has a distance of

Slack 2 S "? S iJmJM £ ίη * ι-'ηα1 τ * η am * Stm« · * «nt & i * hcn light

Between the sheet metal surfaces Ip, 2p, soft the.-, weld together with the intermediate piece under the pressure of the electrode. The outer layer 2b remains undamaged.

A further type of contact formation with a welding pin is shown in FIG. 28. An upper layer 1 with the layers 1 a, 1 b has a stripping at the top; Ic, a stripping Id below and a hole 11 in the middle. A lower sheet metal 2 with layers 2s, 2b is provided at the top with a stripping layer 2s. A pen 52 with a tip is inserted into the bore 11. Its diameter, about 1 au, corresponds to the hole through Eöir.s8r and its upper end rests over the sheet metal! addition to additionally electrode 5. The one pole of a capacitor Ispuls "schwexBenlage K ince de 4 by a cable? Electrode 5 and connected by sin Kcsbel 4c via a regulating resistor 8 aii sheet 1, while

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-Μ—

Then the other pole is over "in Kcb" l 7 en of the sheet 2 oneeichlo "-" η, which rests on a cooling plate 10. When the current is switched on, the contact of the welding pin tip causes the arcs to be ignited between the bare sheet metal flat Ip, 2 ” in the detachment hole, the bare sheet metal surfaces are brought to welding temperature and, under the pressure of the electrode, the molten welding pin 52 is welded together. The outer layer 2b of the sheet 2 remains intact.

A variant eit enlarged Schweißrone FIG. 29. An upper BlecF 1 "it the layers 1a _f Ib above with a stripping Ic, below ax greater AusfrOtung If and in TFER Mitts IISR ty ^ ^ ^t * igh t""* y "sit a bore Ii provided · a lower sheet 2" it the layers 2a, 2b has at the top a "large stripping 2c and is supported on a cooling plate tenth the electrode 5 has a blind bore Se, in which a spring 5f, a Äusschubbölzen 5e and "is inserted into cylindrical? SshwciSstift 52, the underside" is provided with a cavity to form a cutting edge 52b Adjuster * idcrsicp.d 8 with d * m. plate 1 is connected, while aex other pole is connected by a cable 7 in the sheet 2!. BEIEI switching the currents "are the arcs between the cn different by the annular cutting edge of the welding pin 52 Bare sheet metal surfaces Ip, 2p lying in the poles are recovered, the surfaces are heated to welding temperature while the welding pin melts from below, the melt is pressed into the cavity under the pressure of the spring 5f and the bolt 5c and welded

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layer Zb remains intact.

Another example according to FIG. 30 shows the welding of coated metal sheets with low electrical resistance, such as aluminum, brass, copper. Such sleeves are coated comfortably on one side only, since the uncoated inner sides do not rust. An upper sheet 1 with the outer layer 1c is to be welded to a lower sheet 2 with the outer layer 2b. For this purpose, an insulating insert 92 made of paper or plastic with holes 92e is inserted between the uncoated inner sides. Wire pieces 93 with high electrical resistance z * B »made of steel, which have a diameter of about 0.7 cn and a length of 1-5 mm, are inserted into the holes. The lower sheet metal is supported by a cooling plate 10 with cooling tubes 10a on a table 11. A pressure plate 15 is placed on the sheet metal 1 via a cooling plate 10 and can be pressed down by piston 16 and pressure cylinder Y1. The sheet metal 1 is attached to the welding rod and the bishop 2 ax of the Erda. When switching on the current, turn the small ™ Drsfet = piece © railt large electrical resistance arcs ignited in the insulating insert and welded under the pressure of the cylinder. The outer layers la, 2b remain uninjured. This enables us to join coated aluminum sheets using invisible internal welding.

Type of insulation layer with holes and inserted welding spacers insulation strips with wires can be used for efficient processing «Mash Fig. 31 shows a Isolation trelfen 121 holes 122. As an intermediate welding piece

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3g

a wire 123 is provided outside the welding points bit flattened areas 123a and glued to the insulating strip, so that the unforoten threatening parts 123b in the holes lie koaeen to blind the arc there. Danit will rivet the insertion of one of his welding wafers.

The internal welding of sheet metal coated on both sides ;: ISSt looking for old sweat "or pressure steapei devices through * carry out. Zv? For better illustration, the following examples are shown five times enlarged. In the first example in FIG. 32, an upper sheet 1 old the layers 1a, Ib below has a finish If to form a pin Ig and a lower sheet 2 above has a stripping 2c of the same size. The lower sheet metal is supported on a table 11 via a cooling plate 10 eit cooling tubes 10a. Arranged over the upper sheet is a die section 72 of a welding device 71, which is guided through an insulating tube 73 with a “tripod” frame 74 perpendicular to the sheet. The pressure stack has a central bore 72a in which cooling pipes 72b and a compression spring 72c are introduced from obiMi. The pressure stack is held at an adjustable distance of about 1 ns over the metal sheet 1 under the tension of the spring. The sheet 1 is not connected to the Sehweißstron, the sheet 2 is not connected to the earth E. For welding, the discharge current is introduced into the sheet metal 1 to be welded on, without this initially having contact with the decorative sheet 2. Hit de «When the currentless pressure stack hits the welding point from the outside, the sheet is bim with the Ig pin»

6913974 17. OA. 75 ~ '~

-ψ-

To

Keß Flöch «2ρ approached and thereby the arc pre-welding and the swelling of the contact pin" "initiated. By the correspondingly possessed Fedezdruek becomes the sheet metal 1 chig ait his sRgesehselssnsnsB üstesflüÄh * es die ongescfoitdizene welding surface of the sheet metal ·· 2 pressed and tied together. The outer layers remain unharmed usd the outside 2b of the decorative sheet also «while the AwSeftseite la des Helterwnesblechet has a depression »

Another example of an intermediate weld is shown in FIGS. 33, 34. A lower sheet 2 "with the layers 2e, 2b has a stripping 2c ewf," with the bare sheet metal sheets 2p, and is supported by a cooling plate 10 bit liquid cooling 10a o to a table 11. Layering over the Ent · 2c the electrode 5 is a welding device · * ioeiiigestellt74 out in eilnea insulating tube 73 ait Dr * * perpendicular »r sheet surface. Sx · electrode 5 has a central bore 5e for can · compression spring 5f and a holding device 5g for a piece of welding wipers that can be inserted in the electrode foot · Di · drawn · holding device consists of a suction air line 5h _# soft the electrode foot ouslttuft. fUx swgne · tic intermediate jointing pieces 75 can instead be fitted with an electrical ■ agnet · The welding intermediate piece has a slightly smaller diameter than the · stripping 2c and · in · Huh · about twice the sheet metal thickness ·, on its underside it has “ine” small welded-in-between-piece spigot 75g which, before welding, is kept at an adjustable distance from the sleeve 2p with the spring 5fi "pre-applied. The welding piece is 5 suit over the electrode

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-I-

- se- -

des Schweißstzon ynd des Bleeh 2 sit de? Exde £ connected. When the welding torch is held in, the electrode held by a magnetic coil is released, the welding adapter snaps against the sheet curl 2p and does not weld your.

In a further operation, a sheet metal 1 with the layers 1c, Vo and the lower cutout Tf with a welding spigot Ig is broken over the welded intermediate piece on the sheet 2 and held at a small distance above the sheet 2 by a welding device 71 . For this purpose, the de-energized push rod 72 has a holding device 72g, for example with a suction air line 72h, and is guided into an air pipe 73 and a three-leg grease part 74. The sheet 1 is not connected to the welding rod and the intermediate set piece 75 via the sheet 2 is not connected to the earth electrode. When the visual welding strand is switched on, the push button is released, snaps against the metal sheet 1 or the welding rod Ig against the intermediate visual welding piece and welds to it.

A variant for easier processing of a white pencil is shown in FIG. 35. An upper sheet 1 with the layers 1 a, 1 b has a stripping 11c at the top, a stripping Id at the bottom and a hole 1 i in the middle. A lower plate 2 nit the layers 2a, 2b is a top nit stripping 2c provided ma over a cooling plate 10 ni1b Kühirohren 10a supported on a table. 11 A welding device 71 is placed on the sheet metal 1 and consists of an electrode 5, an insulating tube 73 with a divider 74. The electrode

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is under the pressure of the spring 5f νηά is ur.teß sit a holding device 5g for a welding pen 76 is provided. The holding device in the figure consists, for example, of a single suction air line 5h. The welding pin has a flange 76a at the top, it fits into the bore 1 i of the sheet metal 1. Its length corresponds to the thickness of the sleeve and the thickness of the layers Ib and 2a. One pole of your capacitor pulse welding system K is connected by a cable 4 to the electrode 5 and to the sheet metal 1, while the other pole of a cable 7 is connected to the sheet metal 2. When the welding stream is switched on, the electrode 5 is released, the welding pin 76 snaps against the sheet metal surface 2p, ignites the arc between the sheet metal brackets Ip and 2p and welds them. The outer layer 2b of the sheet 2 remains undamaged.

Dar pin can planer arranged over the sheet metal with an air gap and the electrode must be pretensioned so that it does not touch the decorative sheet at first and only through the resiliently rapid springing of the current-carrying electrode when the condenser is switched on. «Aior-Stroaet creates contact and arcing.

Not only sheets of the same and different types, for example steel with brass or copper, steel with aluminum and brass with copper, etc., but also those of extra different thicknesses can be connected to one another. Is required da3 the transition resistance between d% n sheets of metal through which the corresponding special Dinensionierung the contact pin © or the like. is so high that the white torc

6913974 17. OA. 75

Mostly it is forced to use that of de »Sehweißstift to skip a certain distance at first and melt the milled curses.

fine further relief of the outer layers can be achieved by strop · »displacement old help vtm condenser plotting. In the example according to FIG. 36, an upper sheet 1 as a mounting sheet with the layers 1a, 1b has a finish If old a welding cone Ig and a lower sheet 2 as a lining sheet old the layers 2a, 2b with a stripping 2c at the bottom _# The sheet metal 2 is connected to a thin decorative sheet 3 old the layers 3a, 3b, for example by gluing. At least one capacitor film 31c is inserted between the metal sheets 1 and 2 and a capacitor plate 31a, 31b is arranged above the metal sheet 1 and below the metal sheet. The lower capacitor plate 31b is supported on a table 11. Auf

ts 31b L% ± fcln S * k "* Üla # ?? ii 71 ml *

a pressure column 72 is placed, which is guided in an insulating tube 73 ait three-legged frame 74. In a bore 72a of the Druckstespels 72c engages a spring on "The Drucksteapel can bring« U »the welding pin Ig in the correct distance from the bare sheet surface 2p a bore 31d dtr upper Koitdeasatorpiotte 31a by attach and press the upper sheet 1, is DTTR to Welding point the sheet metal 1 is provided with a crank Ik that is still directed downwards. The Siech 1 is old of a Kendeizor-Irpulsschweißanlage and dos sheet metal 2 bit ds? Connected to earth. The Komiessatorplatten are close to the other pole with one pole of a power source and the capacitor foil 31c in the middle between them.

closed »First of all, the power source for the capacitor plates must be maintained, whereby an electric field is built up from the Busseren capacitor plates to the capacitor foil in the middle. When the welding strop is kept in, dieter is pushed from the outside of the sicknesses 1 and 2 towards the inside and is increasingly directed onto the bare feet Ip, 2p. At the same time Drucktteaeel is released, fast against the sheet 1 "it dee welding Zapf · η Ig causes dU ignition of the arc and welded sheet metal surfaces Tp, 2p. OU outer layers of the sheets 1 and 2 and on top of all the outer layer 3b of the sheet 3 remain intact.

A Verküxiüfti umx Scnvtiaztix or a ¥ # sing * xwng of the welding energy can also be achieved by pre-washing the mounting plate ». In the example in Fig. 37, a pressing plate 1 bit on top has layers la, Ib above a desizing Ic and below a desizing Id and iiia underneath Ixtgaad ** Dskaxplech 2 ß with the layers 2e ~ 2b above a desizing 2c. The sheet metal is supported on a table 11 via a cooling plate 10. An electrode 5 is placed on the sheet metal 1 in welding device 71 and guided vertically in an insulating tube 73 old tripod frame 74. The electrode is under the pressure of a 5e in a- Sockbohrung engaging spring öf _# One folic of Sekundirkreiees S a VorwSnanlcge is by sin cable 7e m & mn regulating resistance S with the sheet 1 υηά optionally substituted by one cable Tb also on sinsn Bsguiierwiderstand 8 old de «Siech 2 and the other pole through a cable 4

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A sit the electret 5 connected "" * Furthermore, one pole of a condenser-Iapulssehveißonlofe K is connected by a cable 4k with the electrode 5) the other pole by a lever 7k with the sheet 2; ^A shelf 111 is one of them

Pivot point Ills in · ίη «link · Endless iue switching on the forward position and swiveling in a right endless position for · switching on the welding log. If "switch on 4% x prewarning onloo" current flows through the loosely lying electrode 5 in the sheet metal 1 and from there back through the cable 7e. The switch 111 is pressed by a timer and the welding "": is switched on. The Fedeir Sf is released, the bare sheet metal flaps Ip, 2p are brought closer to each other, the arcs are ignited and the welding is carried out under the pressure of the spring. The preheating of a machine on the press of the sheet 1. The top layer 2b of the sheet 2 remains intact.

To increase the welding pressure of hand-held devices, the <irhx » ^ RfMrHt is ei« · Vakuuafilocktt einöibwit. This means that the device is held at the welding point. At the same time, the Vnkuuei reduces the contact resistance and extends the service life of the electrodes. 1 also has an upper sheet metal with layers 1o _P \ h on top a stripping 1e and below a layer Id, and a lower sheet 2 with the layers 2g, 2k on top an insulation 2c. A transparent vacuum lock 141 bit of a high seal 141a is placed on the sheet metal 1 and connected to a vacuum valve through a valve 145. Xr inside the Vokuasgloeke has an upper flange 141b and a lower flange 141c alt air through-

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• "JTf".

Loßbohruitgen 143 cuf, which hold an electrode at $ 147. The upper guide 147a also serves as an abutment for an electrode compression spring 5f, which loads the electrode 5 via an adjustment groove r 5i. The vacuum bell has a switch 150 and the power supply and control cables 149a, 149b in an upper extension 14? D. For Schwel-3 * n, the electrode together with the vacuum bell, if necessary with the help of a template, is to be placed on the welding point and evacuated. The seal 141a is thereby compressed and the electrode 5 is pressed onto the stripped sheet metal 1. When the welding current is switched on, the arcs ignite between the sheet metal surfaces Ip, 2p and weld under the pressure ό% τ electrode. The outer layer 2b of the metal sheet 2 remains intact.

Instead of pressing * the welding electrodes or currentless pressure stacks through the vacuum bell, electrical appliances can also be provided with soaps; soft · when switching on the magnetic strass & aRzurshwsiS «» dsn bischhefter, and tension the electrode spring.

The welding device can also be held on the sheet metal by electromagnets * The electromagnets © can form the legs of the iron base. Instead of the spring, the electrode or the pressure element can be pressed onto the welding point by compressed air or another electromagnet.

The igniting de? An electric arc can also be created by briefly lifting the upper sheet metal by means of an aesthetics, which is tainted with BeI-zensch. For this purpose, the upper sick part is first to be provided with a lifting bolt. Mesh Fig * 39 is a whether "ret sheet metal part 1 sit don layers Ia, Ib above" it the stripping Ic and ά with a larger Entschichtimg \ down and on the weld with an even geriehtiten bottom bend Ik provided, the amount of ore something "old the double layer thickness amounts to »Inside the desizing Ic a lifting bolt 131 is welded, which has soft notches 131a. The welding point of the preparatory metal sheet 1 is laid with a sheet metal 2-bit layers 2a, 2b and the decoating 2e, which is supported by a cooling plate 10 with recess 10c and coolant supply pipes to a and discharge pipes lob. Between the sheets 1, 2 in the welding point a ring 132 made of difficult-to-melt material is inserted to hold up the melt. When the stream is switched on, the automatic lift-off system, for example by an electric wire, lifts the sheet metal 11, thereby igniting the arcs; welded. Then the lifting bolt is broken off at the notches

Claims (1)

My scribe! from the: Re: German utility model registration G 69 139 74.8 Note: Dr. Becker New protection claims !. ^ Device for electrical joint welding of metal parts which are pressed together during welding} characterized in that the mutually facing inner sides of the metal parts are arranged at a distance suitable for arc ignition and one pole of the welding device with one that is not visible after welding, e.g. bare side wall is connected. 2. Apparatus according to claim 1 for resistance welding, characterized characterized in that contact-forming spacers in the cavity are arranged. 3. Device, in particular according to claim 2 for welding together of coated metal parts, the coating of which is removed in the area of the welding point before welding, characterized in that, that the decoating area acts as a welding cavity for the / 5iiä «£ iJiche ysrfiinba? URnen require written confirmation " / ~ Postal checking account Nuremberg 88260-855 - Bayerische Vereinsbank Nuremberg 2058553 G913974 i7ni7R «_ 2 - Arc welding is used. 4. Device according to at least one of claims 1-3, characterized in that one pole of the welding current is directly connected via an electrode (5) at a stripping point (ic) with a sheet metal coated on both sides (l), while this point is for the purpose for preheating indirectly through a cable (7a) and for welding indirectly through a cable (7) with a metal sheet (2) coated on both sides to be welded with an opposite pole (6). (Fig. L) 5. A device according to any one of claims 1-3, _r characterized ,, that one pole of the welding current across an electrode (5) to a Entschichtungsstelle (ic) of a double coated sheet (l) and with the other pole at a second Stripping point (ic) of the sheet (l) is connected by a parallel electrode (6) directly for the purpose of preheating, while a second left, double-coated sheet (2) to be welded via a cable (4) and a regulating resistor (8) on the Electrode (5) is connected and a third sheet (2) coated on both sides on the right is connected by a cable (7) via a regulating resistor (8) to the electrode (6) for the purpose of welding. (Fig. 2) 6. Apparatus according to claim 4, characterized in that the lowermost plate is arranged au * a cooling plate (1O). (Fig. 2) 7. Apparatus according to claim 1, characterized in that the a pole at a stripping point (ic) via an inner electrode (5) with a sheet metal coated on both sides directly is in connection and for preheating with a concentrically arranged ring electrode (6) is connected, while for welding a second two-sided coated sheet metal (2) to be welded via a cable (7) with the other pole is connected. (Fig. 3) 8. Device according to at least one of claims 1-3, for roller welding, characterized in that the one pole with a roller electrode (5a), which is at a development point (Ic) is arranged, directly connected to a sheet metal coated on both sides (l) and indirectly from the sheet metal (l) for preheating a cable (7a) and for welding indirectly via a cable (7) from a sheet metal (2) coated on both sides to be welded is connected to the opposite pole, while a wire (9) is arranged at the seam between the coated metal sheets (1,2) to form contact is, (Figure 5) 9. Device according to at least one of claims 1-3, for roller welding, characterized in that one pole is connected to a roller electrode (5a) and further via one between the layer (la) of the sheet (l) and the roller electrode (5a) laid wire (9) connected to the opposite pole via a cable (7b) and the opposite pole Via a regulating resistor (8) indirectly, both to the sheet metal (1) through a cable (7a) and via a sheet metal (2) a cable is connected. (Figure 5) To. Device according to claim 9, characterized in that the lowermost sheet is on a metallic, electrically insulated sheet Cooling plate (lo) is arranged. (Figure 5) 11. The device according to at least one of claims 1-3, characterized in that the pole of a secondary circuit S is indirect with a sheet metal coated on both sides (1) via a cable (4) and the opposite pole indirectly via a cable (7) with a two-sided coated sheet metal (2) are connected while between 8913974 04/17/75 the layer (Ib) of the sheet ("I) and the layer (2α) of the sheet (2) for making contact at the welds, wires (9a), preferably with an angular profile, are inserted, the wires (9a) at one pole of the secondary circuit S. (Figure 6) 12. The device according to at least one of claims 1-3, characterized characterized in that the one pole of a secondary circuit S indirectly via a cable (4) with a double-sided coated Sheet (1) and is connected to wires (9a) lying on the layer (2a) and the opposite pole indirectly via a cable (7) to a sheet metal (2) coated on two sides, to transverse wires (9b) lying under the layer (Ib) on the wires (9a) is. 13. Device according to claims Π and 12, characterized in that, that the welds are in operative connection with vibration devices (13). 14. The device according to at least one of claims 1-3, characterized in that one pole of the secondary circuit S is indirectly connected via a cable (4) to a sheet metal (l) which is coated on both sides and is angled in a U-shape at the end and the other pole is connected via a cable (7) with regulating resistor (8) is connected to a sheet metal (2) coated on two sides and engaging in the U-shaped sheet metal and at the welding point the bleaching (1) is provided with internal stripping (Id ₇ Id ¹ ) and that Sheet metal (2) has stripping zones (2c, 2d) into which weldments (20) are inserted. (Figure lo) 15. The device according to at least one of claims 1-3, characterized in that one pole of the secondary circuit S via a Cable (4) indirectly connected to a sheet metal (1) coated on both sides and the other pole indirectly via a cable (7) is connected to a sheet metal coated on both sides (2) and that the sheet metal (l) has an inner decoating (Id) IJ Dl L. fi \ _ »J- _ · 1 C I LJLA ^. / θ— \ I UIIU UU9 DJLCUII \ £ .J IHiI. CJLIICX J-IIIICiCII ti " ve «enen is, in which a welding adapter (20) is inserted. (Figure 11) 16. Device according to at least one of claims 1-3, in particular for capacitor pulse welding, characterized in that capacitor plates (31a, 31b) above and below the welding point are arranged. (Figure 11) Device according to at least one of the earlier claims, characterized in that the thicker mounting plate (l) at the top with a cutout (If) and one directed downwards Pointed (2) provided emi on a thinner oil corpus (2), as well as is welded to the tip (5n) by an electrode (5) with inserted resilient bolt (5m), (Figure 17) ΓΙ 18. Device η ch at least one of claims f-3 _r, characterized in that the decorative layer of the metal sheets (1,2) cn the weld in a recess (lOc) of the sheet support (lo) is cooled by a coolant (loa, b) . 19. The device according to at least one of claims 1-3, characterized characterized in that a conductor (24) is arranged for the indirect supply of the welding current to the cut edges (lsu.2s), consisting of silver-plated copper strips (24a) held elastically on strips (24c), which are pressed by pressing devices (16,17) 6913974 04/17/75 can be pressed on (fig. 16) 2ο. Method according to at least one of claims 1-3, characterized in that the intermediate welding pieces (20, 21) are formed from easily meltable material. (fig. 18,19} "Device only at least one? of claims 1-3, in particular for capacitor pulse welding, characterized in that for the internal _{welding of two sheets O 7} 2) coated on both sides, a cavity (1d, 2c) with bare sheet metal areas (ip, 2p) is to be ignited at the welding point an arc is arranged. (Fig. 2o-38) 22. Apparatus according to claim 21, characterized in that v the surface to be welded (1p, 2p) through the Layers (lb, 2a) are arranged at a small distance necessary for igniting the arc. (Fig. 2o, 37,38) 23. The device according to claim 21, characterized in that the Biechfläche (ip, 2p) has ribs (57,58a, 58b). (Fig. 21-24) 24. The method _£ äach claim 21, characterized in that the Distance required to ignite the arc by pressing in at least one sheet metal surface (Ip) with a pressure stamp (46) is formed. (Fig. 25) 25. The device according to claim 24, characterized in that a welding adapter (45) for ignition in the cavities (id, 2c) with protruding tips (45a, 45b) arranged above and below. (Fig. 26,27) 26. The device according to claim 21, characterized in that in the Cavity (1d, 2a (through a hole (Ii) in the sheet metal (i) a welding pin (52) is introduced with a tip (52a) or a cutting edge (52b) and is welded by means of an electrode (5). (Fig. 28 ^ 29) 6913974 04/17/75 27. The device according to claim 26, characterized by a ^ ¹ pressure bolt (5c). (Figure 29) 23. The device according to claim 21 _T, characterized in that between externally coated sheets (1,2) made of material: · with high electrical conductivity, e.g. aluminum ^, an insulating insert (92) with holes (92a) is arranged, in each hole an intermediate piece ( 93) with high electrical resistance is used and the sheet metal (1) is indirectly connected to the welding current and the sheet metal (2) is connected to earth (Fig. 3o). s- 29. The device according to claim 28, characterized in that as Weld pieces serve wires (l23b) which are outside the welds (122) have flats (123a) and on an insulating strip (121) is glued on. (Figure 31) 30. The device according to claim 21, characterized in that a firing pin (Ig _x 75g, 76) is arranged in the cavity created by the stripping (ld-2c) to ignite the arc, wherein a spring-loaded plunger (72) or the electrode ( 5) is used to ignite the arc. (Figures 32-36) 31. The device according to claim 3o, characterized in that as Firing pin a pin (lg) milled from sheet metal (i) is used. (Figure 32,34,36) 32. Apparatus according to claim 3o, characterized in that a pin (75g) arranged on an intermediate welding piece {75) serves as the firing pin. (Figure 33.35) 33. Apparatus according to claim 3o, characterized in that a hand welding device (71) with a, in a three-legged frame (74) guided, under the pressure of a spring (72c), cooled pressure stamp (72) can be placed over the welding point. (Fig. 32,34,36) 34. Apparatus according to claim Zo _1, characterized in that a hand welding device (T \ ) which is guided through an insulated three-legged frame (73,74), is placed under the pressure of a spring (5f) electrode (5) on the welding point. (Fig. 33,35) 35. Device according to claims 3o and 34 _7, characterized in that a holding device (5g), for example with suction air (5h ₇ 72h), is arranged in the pressure ram (72) or the electrode (5). (fig.33-35) 36. Device, in particular according to at least one of claims 1-3, characterized by a housing (141), e.g. a bell, which the welding point including the necessary welding equipment Seals airtight from the environment and has means for evacuating the housing cavity. 37. Device, in particular according to claims 32, 33 and 36, characterized in that the hand-held device is inside a bell (141) with a vacuum seal via a valve (145) is arranged and the bell jar with an elastic seal (141a) over the welding point on a metal sheet (i) is on. (Figure 38) 38. Apparatus according to claim 37, characterized in that the size of the vacuum in the bell jar is selected to be so large that the electrode spring (5f) or plunger spring is pretensioned as a result. (Figure 38)
39. Device according to Claim 15, characterized in that capacitor plates above and below the metal sheets (1, 2) (31a, 31b) and a capacitor film (31c) arranged between the metal sheets (1,2) and the capacitor plates (31) are connected to the negative pole and the capacitor film to the positive pole. (Figure 36) 6913974 17.0475 40. Apparatus according to claim 21, characterized in that the sheet metal to be welded (l) is provided with upper and lower stripping (Ic ₇ Id) ₇ a crank (Ik) and a lifting bolt (131) on the sheet metal (2) The stripping point (2c) is placed under the interposition of a ring (132) that is difficult to melt, the lifting bolt (131) is clamped and welded in a stud welding device with an automatic lifting mechanism, while the lifting bolt ("131) has notches (131a). (Figure 39) 41. Device according to claim 1 and 36, characterized in that that the arc welding cavities (ld) are connected to an evacuation device (141) and in whole or in part are evacuated. 42. Apparatus according to claim 36, characterized in that the Arc welding cavities (ld) with openings (ii, 1j) for the purpose Connection with evacuation devices (141) are provided. 43. Apparatus according to claim 1, characterized in that at least one of the provided on the inside of one of the metal parts Welding point is formed deepened by tools, thereby producing a metallic welding surface (ip, or 2p) and by coinciding two metallic welding surfaces (1p, 2p) an arc welding cavity (Id) is formed. 44. Apparatus according to claim 43, characterized in that the inside between the metal parts, at the intended welding points, which are at least one of the two metal parts (1,2) arranged coating (Ib, 2a) by cutting rotating Tools, at least up to the production of metallic surfaces (ip, 2p), depressions or protrusions (75g, 1g, 2g) for formation of arc welding cavities (Id) are arranged. 6913974 17.Q4.75 45. Device according to claim 1, characterized in that A * / ^ on the inside between the metal parts (1,2) provided ' Welding points (Ip, 2p) through at least one of the metal parts Embossing tools, depressions or elevations (57, lh, 11, Ik) for Formation of weld cavities (ld) are generated. 46. Apparatus according to claim 45, characterized in that spacing layers (92,121,3Ic, 132,165) between the metal parts (1,2) are arranged, leaving the provided welds (Ip, 2p) free. ν 47. Device according to claim 1, characterized in that the metallic welding surfaces (Ip, 2p) of the cavities (Id) with Profiles (lg, 2g) produced by machining or formative tools are provided. 48. Apparatus according to claim 47, characterized in that the welding cavities (ld) in geometric shapes by machining or formative tools are made. 49. Apparatus according to claim 48, characterized in that Inlay pieces (2o) in the welding cavities for ignition and Maintaining arcs are introduced. 50. Device according to claims 47 and 49, characterized in that that the profiles of the welds or the inlay pieces to achieve a high electrical, the ignition is used Resistance with sharp ends point-like, linear, ring-shaped, cutting edge-like formed towards the welding surfaces are. 51. Apparatus according to claim 42, cladur ch characterized in that the arc welding cavity with at least one opening 6913974 1/17/75 τη ·. ■■■? ι Io (I] ₇ Ii) is provided for the purpose of evacuation. ' 52. Device according to claims 42 and 51, characterized in that an opening (Ii _x Ij) is made by drilling, punching or milling from the cavity to the evacuation device (141). 53. Device according to claim 52, characterized in that that at least one Sqhweißstelle (Ic, or 2c) of a the two metal parts (1,2) from an evacuation device (14l), e.g. a vacuum cup. 54. Device according to claims 51 and 52, characterized in that that at least one of the two metal parts (1,2) is at least partially enclosed by the vacuum bell (141). 55. Device according to claims 42 υ. 51, characterized in that that openings (I]) of the welding cavities to the evacuation device (141) by appropriate training of the welds (Ip, 2p), or the cavities or a = Brought deposits and superimposing the metal parts are formed. 56. Device according to claim 1, characterized thereby. ehnet that the welding device (5,147) forms a device unit with the evacuation means. 57. Apparatus according to claim 56, characterized in that the welding device (5,147) from the bell jar (141) is enclosed. 53. Apparatus according to claim 57, characterized in that the bell jar (141) de-energized pressure means (72). the 6913974 04/17/75 are arranged on the welding cavities for pressure exertion, encloses. 59. Device according to claim 1, characterized in that that the metal parts (1,2) when carrying out the evacuation of their cavities (lp, 2p) through the vacuum bell jar (l4l) and atmospheric influences acting on them Pressure are pressed together. 60. Device according to claim 1, characterized in that the welding current at the welding point through capacitor plates (31a, 31b) from above and below the outer layers (la, 2b) of the metal sheets or metal bodies (1,2) is pushed away. 61. Device according to claim 1, characterized in that that the wall thickness of at least one metal part is reduced. 62. Apparatus as claimed in claim 61, characterized in that a welding pin (Ig ₇ 2g) is arranged for stripping from a sheet metal (1, 2), preferably a point is milled out. (Fig. 14) 63. Apparatus according to claim 15, characterized in that the welding spigot or the tip is formed during the stripping of the sheet (l _r 2). 64. Apparatus according to claim 61, characterized in that that the intermediate piece (2o) has a pin (2oa) or a cup point. (Figure 14) 65. Apparatus according to claim 61 or 62, characterized in that the metal sheets (1, 2) are rectangular or triangular Groove (lf, 2f) for inserting welding balls or wires for contact. 04/17/75 - / - ι U ££ Device according to claim 1, characterized in that a sheet (l) to be welded is provided with at least one lower stripping layer (Ip) and e.g. a lifting bolt (131) is, the lifting pin is placed on another sheet (2) on a stripping (2p) with the interposition of a ring (132) Clamped into a bolster welding device with automatic lift-off and is welded, after which the lifting pin has been broken off at notches (131a). -ί Device according to claim 1, characterized in that the sheet metal surfaces (lp, 2p) to be welded are brought by the "layers (Ib, 2a) or an intermediate layer (165) at a distance necessary for igniting the arc. 68. Apparatus according to claim 1, characterized in that a The sheet metal surface (Ip) is brought to the ignition distance by pressing in with a plunger (46) with a tip. 69. Apparatus according to claim 5o, characterized in that the welding rod {52} has an angcfeiii> bolt (5e) during the Welding is pressed into the cavity. 70. Apparatus according to claim 49, characterized in that as Welding pieces, parts (123b) of a wire (123) are used, the wire outside the welding points (122) with flats (123a) is provided and glued to an insulating strip (121). 71. Apparatus according to claim 1, characterized in that ^ an insulating insert (92) with a recess or holes (92a) is placed between two metal sheets (1,2) in each hole -J- 6913974 04/17/75 an intermediate welding piece (93) is inserted and a sheet metal (l) is connected to the welding current and the other sheet metal (2) to earth or opposite pole. 72. Apparatus according to claim 1, characterized in that in the Cavities (Id, 2c) through a hole (Ii) in the sheet metal (l) Welding pin (52) with tip (52a) or cutting edge (52b) is inserted and welded with the pressure of an electrode (5), 73. Apparatus according to claim 49, characterized in that for ^: igniting the welding arc a firing pin (lg, 75g, 76) is arranged in the cavity (Ip, 2p) and the arc is ignited by a spring-loaded plunger (72) or electrode (5) is. 74. Apparatus according to claim 47, characterized in that the firing pin is one milled from the sheet metal (1) or sheet metal (2) Pin (lg) is used. 75 _m device according to claim 47, characterized in that a pin (75g) attached to a welding piece (75) is used as the ignition pin. Device according to claim 1, characterized in that to the inside welds are made of adhesive, self-adhesive rings, strips or foils and then the welding belt is carried out is. rj ^ Device according to claim 76, characterized in that a double-sided adhesive film (165) provided with protective paper (165a) on the top is inserted on the inside of a sheet (2), the decoating (2c) 6913974 i7.0i.75 carried out, the protective paper removed, the one to be welded Sheet (1) is placed and the welding is carried out. 78. The device as claimed in claim 76, characterized by a pin (76a) with a flange-like widening of the shaft is arranged in a hole in the plate and its flange on the upper plate, while the shaft length is so is dimensioned as required for arc ignition. 79. Apparatus according to claim I _7, characterized in that ^ in the welding cavities between the stripped Welding surfaces (lp, 2p) ionizing agents, preferably an easily evaporating metal powder, for the purpose of igniting an electric arc, or insert pieces, preferably Tenons or points, provided with such means or the welding surfaces are roughened for the same purpose. 80. Apparatus according to claim 34, characterized by means (141b, 141c) for arranging devices (147) in the cavity. 81. Apparatus according to claim 44, characterized by means (5i) for regulating devices. 82. Apparatus according to claim 42, characterized by abutments (141b) for exerting counter pressure. 83. Apparatus according to claim 36, characterized by means, for example a template, for arranging the cavity in a predetermined position to an arrangement surface. 84. Apparatus according to claim 36, characterized in that the bell is at least partially transparent. 6913974 04/17/75 85. Apparatus according to claim 8 and 9 _r, characterized in that the wire is arranged between the welding roller and the upper layer of the upper sheet and, like the sheets, are connected to the opposite pole via the regulating resistor. 6913974 04/17/75