JPS63317265A - Part welding method for sandwich damping steel plate - Google Patents

Abstract

PURPOSE:To improve the welding strength by performing the spot welding on one side of a sandwich damping steel plate with a small parts which is subjected to the stud or projection welding a reference to integrate steel plates by a nugget. CONSTITUTION:The small parts 1 is welded to one side of the sandwich damping steel plate 2 by the stud or projection welding. Next, the spot welding is performed with the small parts 1 as a reference to form the nugget 4 extending over the steel plates 2a and 2b of both sides of the sandwich damping steel plate 2. By this method, a fine weld zone can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for welding small parts to a sandwich damping steel plate.

[Conventional technology]

A sandwich damping steel plate is composed of a plurality of steel plates (usually two steel plates) with a resin sheet integrally sandwiched between them. When attaching small parts to such a sandwich damping steel plate by welding, if stand welding or projection welding, which is used when attaching small parts to a normal single steel plate, is directly applied to welding small parts to the sandwich damping steel plate, The small parts are welded only to the steel plate on one side of the sandwich damping steel plate, and the tensile, torsional, and bending strengths obtained in this state are only equal to the thickness of the steel plate on one side.

In order to solve this lack of strength,
No. 81 discloses that before stand welding small parts to a sandwich damping steel plate, spot welding is performed on the sandwich damping steel plate to locally integrate each steel plate of the sandwich damping steel plate with a nugget, and then this integration is performed. This paper provides a method for welding small parts in a sandwich-type damping steel plate, in which small parts are stand-welded to the damaged parts.

Further, a method similar to this method for welding a stand to a laminate is disclosed in Japanese Patent Laid-Open No. 141372/1983. That is, in the method of stud welding to a laminate plate disclosed in JP-A-60-141372, the laminate plate is first spot-welded, and then a stand is stand-welded to the spot-welded area.

[Problem that the invention seeks to solve]

However, when spot welding is first performed to form a nugget across both steel plates as in the conventional technology, and then small parts (stud bolts, etc.) are welded at the same position as the spot welding, the center position of the spot is the reference point. There was a problem in that it was difficult to determine because there was no position, and therefore positional deviations were likely to occur when welding small parts. Furthermore, even when stud bolts are continuously stud welded using an automatic welding machine, it is currently not possible to easily determine the position of the spot, and even if the position is determined mechanically, it tends to shift little by little. The welding strength of such a misaligned stand bolt naturally decreases.

The problem to be solved by the present invention is a decrease in welding strength due to misalignment between a stand welding or projection welding position and a spot welding position in a sandwich damping steel plate.

[Means for solving problems]

According to the present invention, the above problems are solved by the following method for welding parts in a sandwich damping steel plate.

That is, small parts are placed on one side of the sandwich damping steel plate, stud welding or projection welding is performed, and then spot welding is carried out using the stand welded or projection welded small parts as a reference to separate each of the sandwich damping steel plates. A component welding method for sandwich damping steel plates that integrates steel plates using nuggets.

[Effect]

The welding procedure in the component welding method for sandwich damping steel plates of the present invention is first stand welding or projection welding, and then spot welding, so if the 0 component is first stud welded or projection welded, which is the opposite of the conventional method, Since the area cannot be compressed by the pair of spot welding electrodes, spot welding cannot be applied using the conventional technique. Therefore, conventionally, the idea of performing stand welding or projection welding first and then spot welding as in the present invention could not occur.

However, one of the pair of electrodes for spot welding is an electrode that has a unique shape that corresponds to the male and female parts of the part to be welded, and this electrode is applied to the part from the opposite side of the sandwich steel plate, and the part is interposed between the electrodes. It has been found that by energizing and pressing the sandwich steel plate, it is possible to apply spot welding after the component has been attached to the sandwich steel plate by stud welding or projection welding. Based on this new knowledge, if a stud weld or projection weld is performed first and then a spot weld is performed, the stud weld or projection welded part will conduct current through the sandwich damping steel plate at its attachment point during spot welding. , the stud welding position or the projection welding position and the welding position (spring/) are necessarily aligned with each other, and positional deviation between the two is prevented.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for welding components in a sandwich damping steel plate according to the present invention will be described below with reference to the drawings.

FIG. 2 shows a state in which the first step of the present method invention is being carried out, and FIG. 3 shows a state in which the second step of the present method invention, which is carried out subsequent to the first step, is being carried out. The first
The figure shows the final state of the product after welding with the method invention.

First, in FIG. 2, a component (small component, zero in the drawing shows a stud bolt) 1 is welded to a single-sided steel plate 2a of a sandwich damping steel plate 2.

When the part 1 is a stud bolt, stud welding is applied, and the part 1 has a flat plate part, and a plurality of protrusions are formed locally toward the sandwich damping steel plate 2 by forming or the like on this flat plate part. Projection welding is applied to such parts. Stud welding itself is a well-known stand welding method such as arc stand welding, percussion stand welding, and resistance stud welding, and usually the part 1 is welded using a chuck of a welding gun that is electrically connected to a welding power source.
, the single-sided steel plate 2a of the sandwich vibration-damping steel plate 2 is also electrically connected to the welding power source, and an arc and current are passed between the component 1 and the single-sided steel plate 2a of the sandwich vibration-damping steel plate 2, and the heat generated at this time causes the component 1 to is welded to the single-sided steel plate 2a of the Santoifuchi vibration damping steel plate 2. At this time, the melted and solidified portion is usually limited to only the single-sided steel plate 2a of the sandwich damping steel plate 2, as indicated by the reference numeral 3 in FIG. It is unlikely that it will reach the resin member 2C that is integrally sandwiched between them (however, no particular problem will occur even if it does reach it).
In the case of stand welding, the molten solidified portion 3 is formed in a shape corresponding to the entire end face of the component l such as a stand bolt on the sandwich damping steel plate 2 side. On the other hand, in the case of projection welding, projection welding itself is well known, and in the case of projection welding, the molten solidified portion 3 is formed in the shape of a portion corresponding to the local protrusion of the component 1. Even in the case of projection welding, the molten solidified portion 3 rarely reaches the resin member 2C of the sandwich damping steel plate 2.

The part 1 welded by stud welding or projection welding in Fig. 2 is still only welded to one side steel plate 2a of the sandwich damping steel plate 2, so the tensile, torsional, and bending strength obtained in this state is Since it was conventionally thought that spot welding could not be applied after this, it was thought that only the strength corresponding to the thickness of the single-sided steel plate 2a can be obtained, so it is either used as is or double-sided steel plates 2a, 2b are used. If you want to obtain strength corresponding to the thickness of is as described above.

However, in the present invention, the component 1 is welded to the single-sided steel plate 2a of the sandwich damping steel plate 2 by stud welding or projection welding as shown in FIG. 2, and then spot welding is further performed as shown in FIG. Apply. In FIG. 3, a pair of spot-welded electrode tips 5.6 that press sandwich vibration-damping steel plates 2 between them is such that one tip 5 on the side corresponding to component 1 plays with the component 1 in a male-female relationship. The chip 5 is formed into a specially shaped chip having a shape corresponding to the fitting, and this chip 5 is brought into contact with the component 1 instead of the damping steel plate 2 to press the component 1 toward the distribution steel plate 2 side. The other opposing chip 6 applies the pressing force applied from the chip 5 to the distributed steel plate 2 via the component 1 just as the one chip 5
The shape and arrangement are such that it can come into contact with and receive the other steel plate 2b of the sandwich damping steel plate 2 at a position facing the sandwich damping steel plate 2. Spot welding is performed in this state, and a nugget (molten solidified portion) 4 is formed across the double-sided steel plates 2a and 2b of the sandwich damping steel plate 2, and the double-sided steel plate 2a s 2
b is integrated. In spot welding of the sandwich damping steel plates 2, a short circuit as shown in the diagram is formed between the double-sided steel plates 2a and 2b. , one chip 5
One part l - One side copper plate 2a - Short circuit - Other steel plate 2b -
Current flows through the circuit made up of Chiapro, and heat is generated almost concentratedly at the contact area between the sandwich vibration damping steel plate 2 and the component 1 and the chip 6, which have high electrical resistance due to contact.
The resin member 2C of the sandwich vibration-damping steel plate 2 at the part corresponding to that part is melted, and the melted resin member 2C escapes around by the sandwich vibration-damping steel plate 2 being held and pressed by the chip 5.6, and the double-sided steel plate 2a . When the current is turned off and the material is cooled, it solidifies to form a nugget 4, and the parts are integrated. In Fig. 2, when component 1 is welded to sandwich vibration damping steel plate 2 by projection welding, when component 1 is pressed with tip 5, component 1 simultaneously attaches sandwich vibration damping steel plate 2 with its multi-point projections. Press in the position corresponding to this protrusion.

The double-sided steel plates 2a and 2b form multiple nuggets.

Finally, the welded product shown in FIG. 1 is obtained.

Therefore, the nugget 4 is always formed at a position corresponding to the position pushed through the part 1, and the position of the nugget 4 across the double-sided steel plates 2a and 2b formed by spot welding is the same as that of the sandwich damping steel plate 2 of the part 1. It will not deviate from the welding position.

If a nugget is first formed by spot welding as in the past, and part 1 is welded to the sandwich damping steel plate at the spot welding position, it is difficult to visually confirm the position of the nugget 4. Since stand welding or projectile welding and spot welding are performed in separate processes, there are transportation of goods and time lags between them, making it increasingly difficult to accurately confirm the spot welding position. It is difficult to accurately attach parts to spot welding positions, and if the parts are installed in a shifted position, the strength improvement achieved by local integration of the double-sided steel plates will not be achieved. However, the method of the present invention does not cause positional deviations as in the conventional method, and can eliminate the laborious and skillful work of confirming the spot welding position by visual inspection or the like.

〔Effect of the invention〕

According to the present invention, it is possible to simply make a slight shape change to the electrode tip for spot welding, which does not involve an essential increase in cost (after performing stand welding or projection welding, spot welding is required). Welding is performed to prevent misalignment of the welding position in both processes.
It may be possible to reliably obtain the strength to be increased.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a sandwich damping steel plate with parts welded together, obtained by implementing the method invention, and Figure 2 is a cross-sectional view of a sandwich damping steel plate with parts welded together, obtained by implementing the method invention, and Figure 2 shows stand welding of stand welding or projection welding according to the method invention. Cross-sectional view of the state Figure 3 is a cross-sectional view of the state where spot welding is being performed. 1...Part 2...Sandwich distributed steel plate 3...Melt solidification part by stand welding or Progeexilon welding 4...Nugget by spot welding 5.6・・・
...Spot welding electrode tip patent application filed by Tomei Jidosha Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) Small parts are placed on one side of the sandwich damping steel plate, stud welding or projection welding is performed, and then spot welding is performed based on the stud welded or projection welded small parts to form nuggets of each steel plate of the sandwich damping steel plate. A method for welding parts in sandwich vibration damping steel plates that are integrated by