JPS6195782A - Stud welding method - Google Patents

Abstract

PURPOSE:To perform a positioning correctly in case of performing numerous stud weldings by arranging on a base metal the guide plate arranging majority regularly the through hole of a stud and by standing on the base metal with passing the stud in insulation through said through hole. CONSTITUTION:A ferrule 6 is fitted to the welding side of a stud 4 after inserting collars 5a and 5b into the stud 4 held by a stud welder chuck 10. The welding with a welding base metal 1 is performed then by setting the stud 4 to a plate 2 with setting the outer peripheral face of the lower part of the collar 5b to the inner peripheral face of the through hole 8 of the guide plate 2. As this result the marking-off work for the stud welding position deciding can be omitted by using said composing guide plate and the work can be simplified. The positioning of the stud is made more correct than the time when the conventional marking-off was made and the rationalization and high accuracy stud welding can be achieved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for welding a stud onto a base material, and in particular, a method for welding a stud onto a base material using a jig for accurately setting the welding position of the stud. This relates to a welding method.

[Conventional technology]

When welding multiple studs on one base metal, the second
As shown in the figure, draw an appropriate number of marking lines 21 in the shape of a board pattern on the base material 1 on which the stud is to be erected, and mark a punch mark 22 at the intersection of these lines to be the welding center, or perform welding. A common method is to draw a circle 23 centered at the center position (a circle with the same radius as the stud) and perform stud welding in alignment with these marks. Next, Figure 3(a)-(
A typical example of stud welding (cyarc method using arc welding method) will be explained according to d). First, Figure 3 (a
), the tip of the stud bolt is covered with a seven-erule 6 made of heat-resistant porcelain, and the deoxidizing refining part 11 is brought into contact with the base material. In this state, pull the trigger of the welding gun and apply current.

Next, as shown in Fig. 3(b), when the stud bolt 4 is pulled up, an arc is generated between the stud bolt 4 and the base metal 1 inside the 7-work rule 6, and the welded metal part 5 and the base metal 1 are melted. be done. After a certain period of time, the stud bolt 4 is pressed against the base material 1 as shown in FIG. 3(c), and the current is cut off to complete the welding. At this time, the ferrule 6 plays the role of a mold, and after welding is completed, it is broken and removed (the state shown in FIG. 3(d)) to complete the erection of the stud.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional method, it is necessary to draw out marking lines on the surface of the base metal 1 as a work before stud welding, and there is a problem that a lot of time is wasted in this work. . Moreover, it is difficult to avoid dimensional errors due to poor precision in the marking work itself, and errors when aligning and installing studs, and these errors overlap.
There was a problem in that the positioning error during stud welding became very large.

Therefore, when welding a large number of studs, the inventors
The present invention has been completed through repeated research into a method that allows for accurate positioning and also allows the work to be accomplished easily and in a short time.

[Means for solving problems]

In the stud welding method according to the present invention, a guide plate in which a large number of through holes for studs are regularly arranged is arranged on a base material, and the studs are passed through the through holes insulatively and erected on the base material. There is a gist in welding.

[Operation] A stud through hole corresponding to the welding position is bored in the guide plate placed on the base material to be welded), and this through hole becomes the stud welding position. Then, a guide plate is placed on the base material, and a stud is erected through the through hole.
The structure is such that the welding current is not leaked to the base metal through the guide plate, and stud welding work can be performed continuously and accurately.

〔Example〕

A typical embodiment of the present invention will be described with reference to FIGS. 1, 4, and 5. As shown in FIG. 4 (perspective view), a guide plate 2 having the same dimensions as the base material 1 and provided with a plurality of through holes 8 corresponding to the stud welding portions is placed on the top of the base material. The guide plate 2 is made of stainless steel or a layer of mild steel. A spacer 3 is interposed between the base material 1 and the guide plate 2 so that a gap is formed between the base material 1 and the guide plate 20, and the stud welding part is arranged so as to have a space. In addition, in order to obtain an accurate positional relationship between the base material 1 and the guide plate 2, it is necessary to align the base material 1 and the guide plate 2 with at least two adjacent reference planes of the reference planes a, t), g, and d. Recommended, this allows you to accurately set the position of the stud weld. After the base material 1 and the guide plate 2 are aligned at the reference plane, the base material 1 and the guide plate 2 are fixed using a clamp (not shown) or the like. After fixing the base material 1 and the guide plate 2, a stud is placed at the center of the through hole 8, and stud welding is performed in sequence. The configuration order will be explained according to FIG. First, the collars 58 and 5b are inserted into the stud 4 gripped by the stud welder chuck 10, and then the errule 6 is fitted into the welding side of the stud 4. Next, the stud 4 is set on the guide plate 2 such that the lower outer peripheral surface of the collar 5b is aligned with the inner peripheral surface of the through hole 8 of the guide plate 20. In addition, this fitting order is as follows:
The collars 5a, 5b and studs 4 may be placed on top and fitted into the bottom in sequence.

In this embodiment, a highly heat-resistant insulator such as Bakelite is used as the collar 53 to prevent leakage of welding current from the stud 4 to the guide plate 2.

Since the cuffs 5a and 5b are all shaped with a hole in the center, they should be positioned in the center of the through hole 8 of the stud 4Fi guide plate 20. This state is shown in Fig. 5 (cross section). After the setting of the stud 4 as shown in FIG. 3 is completed as described above, stud welding is carried out in the order explained in FIG. Once the stud welding at one location is completed as described above, move the stud welding machine to the next through hole 8, and weld the studs one after another in the same way until all the welded studs have been welded. The guide plate 2 is erected on the base material 1 and removed from the base material 1.

Furthermore, the application of the present invention is not limited to studs with a straight-shaped trunk as shown in FIG. 5, but also to studs with a special shape in which the welded part has an enlarged diameter, as shown in FIG. 6, for example. This can also be sufficiently addressed by making the guide plate 20 through-hole 8 large.

In addition, if the welded stud 4 breaks for some reason, remove the broken stud 4 from the base metal 1), perform cutting to flatten the welded part on the surface of the base metal, and weld a new stud again. Even in such cases, the guide plate 2 can be used to accurately position and repair the stud. That is, when performing stud welding again, stud welding is performed with the insulating collars 5a and 5b arranged in the through hole 8 of the guide plate 2 as described above.

Further, the guide plate 2 can be used for the cutting work of the welding surface, which can also be called a preliminary work for welding, as shown in FIG. 7 (cross-sectional view). That is, the collars 5a and 5b are replaced with the collar 13 and the bearing 12, and the collars are fitted into the through hole 8.
13 Fit the cutting tool tip 14 along the inner circumferential surface and cut the broken stud to make it flat. By using the same guide plate 2 when repairing stud welds in this way, both base material cutting and stud welding can be performed at accurate positions.

〔Effect of the invention〕

By using the guide plate with the above-mentioned configuration, it is possible to eliminate the raking work for determining the stud welding position, simplifying the work, and the stud positioning can be done using the conventional raking. During this process, we were able to streamline and improve the precision of welding the studs.

[Brief explanation of drawings]

FIG. 1 is an assembly diagram showing a typical embodiment of the present invention, FIG. 2 is an explanatory diagram showing a conventional raking method, and FIGS. 3(a) to (d)
) is an explanatory diagram showing an example of the stud welding method, Figure 4 is a perspective view showing the state when the guide plate is set on the base metal, and Figures 5 and 6 are the diagrams when the stud is set on the base metal. FIG. 7 is a cross-sectional view showing the case where the guide plate of this embodiment is used to cut a base material. 1... Welding base material 2... Guide plate 3... Spacer 4... Studs 5a, 5b... Force;
7-6... Ferrule 8... Through hole 9.
-・Through hole protrusion 10... -Welding machine chuck 12...
・Bearing 13...Collar 14...Cutting tool tip 21.23...Scribbling 1s22...Punch mark Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7

Claims (1)

[Claims] Stud welding is characterized in that a guide plate in which a large number of through holes for studs are regularly arranged is placed on a welding base material, and the studs are passed insulatively through the through holes and welded so as to stand up on the base material. Method.