High-frequency resistance spot welding method and structure

[Detailed Description of the Invention]

The present invention relates to the structure and the method welding of a resisting point and an especially small lightweight welding structure perform resistance spot welding. the welding structure by the present invention -- a bush / pull welding -- Let's go -- having a transformer of double mirror image relationship with each single object secondary circuit with the electrode portion using the synchronous high frequency electrical resistance spot welding signal mutually strengthened like of one which kept and closed the close interval mutually -- each transformer, such as this, You adjoin immediately the welding part which the processed goods which it is going to weld tend to produce in the side opposite to mutually, and make it located in it, and it approaches to each processed goods during welding, and far moves to Orientation again, the efficiency of Yo Si welding is improved to removing a lead thick [ between each above-mentioned welding transformer and each welding electrode ] and long, and it comes out. Resistance spot welding is usually conventionally performed on the regular power line frequency of 60 Hz. The transformer conventionally used on such frequency is very large-sized, and heavy. Such a welding transformer is 100 pounds or the weight beyond it in many cases, respectively. Since such a size and weight of equipment become difficult to approach a welding zone by this, usefulness falls remarkably. When a transformer is located in welding, ', and a distance substantial from a zone, a very long lead is as orange between a welding transformer and a welding electrode conventionally at necessity. It has a single transformer used for the conventional spot welding device to supply current to two welding electrodes generally located so that current might be added to processed goods, It pushes mutually so that the processed goods which are going to apply and weld forge power (forging force) via the above-mentioned electrode may be welded at a desired temperature. With such a structure, although welding current flows between each transformer output terminal and each welding electrode, two leads of some kind are needed. Since high current (5, [100 to 5 [1, 00 [1 A, or more than it) is needed for resistance welding, a cross section must make the lead in which welding current flows from a good conductor like Dog killing copper. Yo Si resistance welding equipment is heavy, and movement is difficult for this demand and becomes Ah Si and quantity value to it. Si who needs to water-cool leads, such as this, in many cases and in which expense is still higher -- it becomes complicated again. - Holding a welding electrode in the state where it consistented mutually again, it is necessary to support leads, such as this, on a rigid framework so that power can be applied to electrodes, such as this. This is an important point which must be taken into consideration by resistance welding. Since a welding electrode must be relatively movable so that desired forge power may be applied, it is necessary to make one side of a lead into flexibility so that such movement can be performed via some bending joint or Slip joint of a kind. When welding is desirable, it is necessary to lengthen each lead in the zone which separated the distance which comprises the edge of processed goods as enough to cross a welding zone and reach. When moving like [ in case the processed goods which it is going to weld are automobile assembly lines ], the lead between a transformer and a welding tip is a thick flexibility cable. Especially the lead that connects a welding transformer to each electrode by the conventional resistance spot welding method became the origin with a remarkable feebleminded rate, when the necessity of lengthening this etc. since processed goods are large used Ah Si and a flexibility cable. Si of all the energies who comes from a welding transformer. To consume the above as heat within a Yo Si lead to the operation of resistance and conduction is not that it is rare. before, as for the voltage which comes by some use from a welding transformer, this reaches a welding part -- no less than 95% -- although -- it decreases. When the zone which it is going to weld is surrounded by some obstacle, both, such as a conventionally special--shaped lead, an electrode, or this, may be needed. It was required for the member of special shape, such as this, to be strong with conductivity, and that expense and weight usually increased in Ah Si and this case with metal Ah Si, therefore conventionally. The lead between the welding transformer in the conventional resistance spot welding method and an electrode was the remarkable origin of the problem of maintenance. The zone where a lead breaks down easiliest is a position which bends so that leads, such as this, may permit a motion of a welding electrode. Since Yo Si and a movable part wear out and get fatigued from the movable joint which sends a high current in such a position, a welding machine is damaged. The welding structure which performs the conventional welding which was described above is an example in Drawing 1 of an accompanying drawing. Welding structure 11 is provided with transformer 15 fixed to the fixed position of profound metallic frame 13 of C type, and frame 13 in most. Transformer 15 is provided with - next winding 17, secondary wind line 19, and iron core 21. each welding electrode 23.25 should pass the conductor, lower Syros Ching 33, and frame portion 35 which comprise top Syros Ching (platin) 27, bending lead 29, and lead 31 -- it connects with secondary wind line 19 of transformer 15, and comes out. Frame portion 35 is movable in the up-and-down direction within slider 37 of frame 13 according to adjustment of piece 39 of the Knee supporter like illustration. Syros Ching 27 -- air pressure -- or be alike fluid pressure drive cylinder 43 -- it supports and comes out so that it may move up and down while welding to Silam 41. That is, in operation of the conventional welding machine, i.e., welding structure 11, as shown in Drawing 1, a 60-Hz electric-welding signal is added to primary winding 17 of transformer 15, locate processed goods (not shown) between two electrodes 23.25, and boil Syros Ching 27 rum 41, sagging lead 29 at the time of the operation of cylinder 43 -- it moves downward [ of Drawing 1 of Si ]. If a circuit is closed through the processed goods between two electrodes 23.25, the signal of the high-electric-current low voltage will return in a peak the conductor which comprises conductor 31.29, 27, electrode 23, processed goods (not shown) and welding electrode 25, Syros Ching 33, frame portion 35, and slider 37 to transformer secondary wind line 19. Such a structure and operation are inefficient to the conventional welding form which was described above. According to the present invention, the high frequency resistance spot welding structure and method according to a double transformer are acquired. According to the present invention method and the structure, the lead between a welding transformer and an electrode is excluded, and welding frequency is raised. With increase of welding frequency, the weight saving of the transformer can be carried out small remarkably, it can be Ding adjacent(ed) to a welding zone, and can be located now. present invention To structure was located in the space relation of a mirror image so that it might be located in the side which the processed goods which are going to carry out spot welding mutually counter mutually -- each -- it has another welding equipment. Transformer twisted around Round Si of the endless form transformer iron core which passes along the central part of Round Si of U type transformer secondary circuit of a single object with each electrode portion of one, and this U type transformer secondary circuit by the example made preferred [ each Fecundity device, such as this, ], and this iron core - It has the welding transformer with next coil. in a present invention structure, it lets the high frequency resistance welding electricity signal made into the phase relation which assists each - next winding mutually during Lightly and welding pass, and comes out. two resistance welding parts which apply forge pressure and can adjust the distance of a between between each end of Yo Si U type transformer 2 Missing circuit are simultaneously formed in a present invention structure, and it appears in it. A single welding transformer is used in the another example of a present invention structure. Two welding electrodes electrically mutually connected instead of the secondary transformer are used. the case of the example which this method equipped with two transformers -- When -- although it is not effective, the weight of welding equipment can be reduced still more for main uses, and a size can be made still smaller. In the resistance spot welding structure provided with the single object U type transformer secondary circuit component which has an electrode portion of one in the example made suitable according to the present invention method, A bush / pull welding is performed between each electrode portion of the piece of a secondary circuit part of a transformer, and the high frequency electrical resistance spot welding signal of the phase is supplied so that forge pressure may be applied between each transformer secondary circuit component. In the example which is made suitable unlike ordinary resistance welding, the transformer can insert the processed goods which tend to be moved with a welding electrode and it is going to weld between them. Usually, it is fixed to a welding electrode and the welding transformer which moves with electrodes, such as this, cannot be provided. since the metal welded expands as character of resistance welding processing, and the reason ranks next, is fused partially and forms a welding part -- first -- mutual -- Far away or Si -- it is because early movement of the welding ? electrode which subsequently approaches mutually is needed. Since metal changes a size so that uniform fixed forge pressure may be kept to a welding zone when forming a welding nugget (weld nugget), each welding electrode needs to move early freely. However, it is Courage without being based on the member into which the current of the flexibility between a transformer and each welding electrode flows through this rapid Motion since the weight of the high frequency transformer of a present invention transformer is light. - It is I]0. In the present invention, a welding transformer and each welding electrode are made into the unit of one. in this case, in a person, 1 constitution pressure machine welding spreads the character of A -- it changes. Transformer resistance welding guns differ and the structure of A is [ , ] really [ ordinary ] Guiding or Powerful about electricity. Therefore, although the mechanical structure of Bathing cancer has a light weight of a plastic material or some others, it can be made from a strong material. Since an electric conduction rate is not a factor of material selection, far large flexibility is obtained by selection of material. A welding use with required making both, such as that it can act in that a small transformer and very small good welding can be carried and performed by obtaining A or the extremely limited space or this, is possible. The example of a present invention high frequency resistance spot welding structure is described in detail about an accompanying drawing below. The city where, as for the double transformer type high frequency resistance spot welding structure by the present invention, a point and processed goods 14.16 which it is going to weld counter mutually as shown in Drawings 2 and 3. It was alike and has each single welding structure 10.12. Welding structure 10 is provided with transformer 18, means 20 to apply forge pressure to transformer secondary circuit component 22 which has each welding electrode portion of one like the after-mentioned, and high frequency welding electrical energy source 24 linked to transformer primary circuit 26. Welding structure 12 is similarly provided with transformer 28, means 3o to apply forge pressure to welding transformer secondary circuit component 32 which has a welding electrode portion of one similarly, and high frequency welding electrical energy source 34 linked to transformer primary circuit component 36. The electric signal which synchronization structure 38 is provided between electric-welding energy source 24 and electric-welding energy source 34, and passes along synchronization structure 38 is synchronized, It is made to perform a bush / pull (push /pull) i@ Contact so that welder Neller which passes along transformer secondary circuit component 22.32 may be strengthened and it may state below. Transformer secondary circuit component 22.32 is the root mutually grinding. it constitutes and comes out of a solid object which comprises a conductive material like suitable copper to use as a welding electrode. That is, transformer secondary circuit component 22.32 is a transformer secondary circuit component of a single object, and there is. As transformer secondary circuit component 22.32 is shown in Drawing 2, the transverse direction size of one dish of U type members, such as Ah Si and this, and the open end of those is 2 in by U type, and height is [ 'l in and thickness ] 2 inches. Each transformer secondary circuit component 22.32 of each other is adjusted so that it may become a relation of a mirror image mutually at the side whose processed goods 14.16 counter mutually like illustration. Welding structure 10.12 is provided with iron core 40.42 so that still more clearly [ Drawing 1 ]. All the outlines are rectangles generally and, in l collaboration, each iron core 40.42 is a piece of an endless portion surrounding the central portion, i.e., the joining segment, of U type transformer primary circuit component to carry out. Transformer iron cores 40.41 are some of carried type bushes / pull resistance spot welding structures in practice. That is, iron core 40.42 can be used for adjoining processed goods 14.16 inside the boundary of a welding part, and supporting welding structure 10.12. In operation, each welding structure 10.12 is located in the side which processed goods 14.16 counter mutually like illustration, and the end and each electrode of a transformer secondary circuit component of one are adjusted mutually. The high frequency electrical resistance spot welding signal which synchronized from source 24.34 of a signal synchronized with synchronization structure 38 is produced, and the welding current which passes transformer secondary circuit component 22.32 forms two welding parts mutually simultaneously between the ends of strong Up Si and transformer secondary circuit component 22.32. In such a structure, it is with transformer iron core 40.42 at the time of operation of the source of 50 lots thru/or electric-welding energy with a high frequency of 5000 Hz, Therefore, according to a request, you can make it still smaller, and can make it located in the portable welding unit which adjoined the zone where each processed goods 14.16 tend to weld this etc., and was applied and cut in transformer secondary circuit component 22.32 and primary circuit component 26.36. such a structure and a method -- the weight of the whole welding equipment -- about 50 pounds or less -- Si and the weight of each welding transformer are about 15 pounds. As it indicates Drawing 1, Drawing 2, Drawing 6, Drawing 4, and Drawings 5, 6, and 7 again that it described above, a long and heavy lead is completely excluded, and the energy loss of the welding electrode of the conventional resistance spot welding structure and such a lead between transformers and the problem of maintenance of a present invention structure are lost. in welding structure 48 by the example shown in Drawings 4, 5, and 6, it makes it located and comes out of transformer 50.52 to the side which processed goods 54.56 which are going to carry out resistance spot welding counter mutually. to be shown in Drawings 4, 5, and 6, transformer 50.52 is mutually the same, and a transformer iron core (not shown) boils it -- Si -- it has the primary circuit and secondary circuit which were separated mutually. Water cooling of each transformer 50.52 can be carried out. for this reason, transformer 50.52 -- respectively -- a stream -- traffic -- way 58 and stream appearance passage 60, and a stream -- traffic -- way 62 and stream appearance passage 64 are provided, and it comes out. Welding electrode 68.7CI which countered mutually and was adjusted. it is connected to a transformer secondary circuit so that clearly [ Drawing 4 ], and it makes it located and comes out of 72.74 to the relation which counters the side which processed goods 54.56 counter mutually. from the transformer secondary circuit where this etc. collaborate, Take Si can be made to carry out sushi, and comes out of each electrode 68, 70, and 72.74. That is, a transformer secondary circuit may be [ of some transformer secondary circuits with the output terminal which fixes each electrode ] arbitrary. it is made to cross mutually and comes out of each electrode so that the interval between each welding part formed of this etc. may be changed, so that clearly [ a person skilled in the art ]. or -- each -- it may be made to produce a welding interval which provides different fixed space between each electrode attached to this, and is different in another transformer secondary circuit Like illustration, each transformer 50*52 of a present invention structure occupies abbreviation'/>6 ft", respectively, and it supplies the current up to 30,000 A with processed goods. As described above, a transformer is supported from the lightweight frame structure provided in non-conducting material like a plastic material in practice. This is because transformer 50*52 does not need to conduct current through each piece of a frame part of the welding equipment which is a part. Forge power is mutually applied to each transformer directly from an opposite direction. Or one side of a Yo Si transformer may be fixed to a request, and forge power may be applied to the transformer of another side. Each transformer moves with an electrode and performs spot welding. Since transformers, such as this, are light compared with the conventional welding transformer, transformers, such as this, do not become the hindrance of the production rate of the spot welding structure which carried out Yo Si composition to the present invention. In the another example shown in Drawing 7, it is Use instead of transformer 52 about easy conductor 80 which adhered each electrode 72.74. As described above, this structure of the example using the transformer of 21 *- is not effective in When. However, the welding structure which has still still lighter weight and a still smaller size in using for the use which needs the consideration about weight and a size is obtained. In the present invention, as described above still, more for example, in one side or both of a transformer structure, Motion can do Surely in every example. The pressure for welding is applied according to a single structure in which the single transformer secondary circuit component was made to collaborate by request. to the request, things other than U type may be sufficient as a Yo Si transformer secondary circuit component, and it described it above in practice -- as -- a very short lead -- Yo Si -- each -- the ordinary transformer winding which connected another electrode member may be sufficient. As for the present invention, although the present invention was explained in detail about the example above, it is needless to say that change transformation of Planting can be performed without deviating from the soul in addition.

[Brief Description of the Drawings]

In Drawings 2, Drawing 1 is a side view of the conventional spot welding structure, and a diagram side view of one example of the double transformer type high frequency resistance Spot welding structure by the present invention which enforces the present invention method, In the front view of Drawing 2, the partial front view of example of a present invention high frequency resistance spot welding structure with another Drawing 4, and Drawing 5, the side view of Drawing 4 and Drawing 7 of the top view of Drawing 4 and Drawing 6 are [ Drawing 6 ] Drawings 4 and the various front views of still another example of a present invention high frequency resistance spot welding structure. 10.12 ... welding structure, 14.16 ... processed goods, 18.28 ... welding transformer, 20.30 ... a means to apply pressure, and 22, 32 ... secondary circuit, 24.34 ... welding electrical energy source, 26.36 ... primary circuit, 40.42 ... fair copy (with no change by contents) written amendment Method of an iron core drawing Display Showa 62 patent application 3rd (related applicant-for-a-patent Meda with the person incident which carries out 188 (11), the name high frequency resistance spot welding method of an invention, and structure amendment, parrot parete id (February 23, Showa 63 dispatch)) of an incident