JPS5874289A - Resistance welding method and electrode for resistance welding - Google Patents

Abstract

PURPOSE:To use welding current effectively and weld contact members, etc. to backing materials in a stable state by holding a member to be welded with an electrode provided with a recess, insulating the electrode from a welding base material and subjecting both materials to resistance welding. CONSTITUTION:A spherical recess 2 is provided on the surface 1 at the preceding end of an electrode 4 for resistance welding, and a hard electric insulating material 3 of Al2O3, etc. is coated on the outside surface in the preceding end part excluding the recess 2. A member to be welded such as a contact material 5 of approximately semispherical shape consisting of Ag is held by the recess 2 of the electrode 4 and while the part other than said recess 2 in abutment on one end part of a base material such as a backing material 6 consisting of phosphor bronze is insaulated electrically by the material 6 and a hard electric insulating material 3, both materials are subjected to resistance welding, whereby a product of an electric contactor 7 or the like is obtained. According to this method, the products of good quality and high welding strength are obtained stably without eluting from the weld zones, scattering of expulsion and surface flash, inclination of the material to be welded, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resistance welding method and an electrode for resistance welding.

Conventionally, Cr
-Cu, A g -W fp
1 was used to hold down a part of the temporarily welded member and apply resistance to the #1g# base metal.・However, like this 9. In the method of resistance welding to the #welding material by holding a part of the member in the bath m, the #il contact* of the workpiece is
It is difficult to make complete contact with the base material, and due to slight distortion or deformation of the welded part, the pressurizing force at ms may be reduced to I! ! Because it is difficult to weld the entire contact surface, stable welding is not possible, and the #l contact member is tilted and fI4 contact is made.9
, melting from the welded parts and scattering of dust occur.

The present invention has been made to solve such problems, and provides a resistance welding method and a resistance welding electrode that allow stable ffj to be performed by bringing the welding surface of the workpiece into complete contact with the metal bath welding base material. We aim to provide the following.

The resistance welding method of the present invention is to electrically insulate the holding electrode from the bath base material and resistance weld the #IN member to the bath base material while electrically insulating the entire ``4jiL#4'' contact member. There are □ characteristics.

□Resistance bath Ii1 Myoden 1#jA of the present invention for carrying out such a resistance tfm method is provided with a recessed portion on the tip surface for holding down the entire workpiece to be welded, and at least the outer surface of the tip portion excluding the recess st. It is made by covering one layer of 1C hard electrical insulation material.

In the resistance welding method of the present invention, since the entire member to be welded is held down by the electrode, even if there is slight distortion or deformation in the 4j1 yakuso rare material, the welding process will cause the welding thII'i welding base material to have a complete V during welding.
C. Resistance welding can be performed in a tightly packed state, and stable bath welding can be obtained. In addition, when the electrode presses down the entire workpiece, even if it comes into contact with the electrode/Ii seedling base metal, it is electrically insulated, so the welding current Fi does not flow directly to the weld base metal, and all the workpieces are connected. The welding current can be used effectively by flowing through the member.

However, the resistor l@connected i4 pole of the present invention has 11 at the tip.
A recess is provided to hold down the entire bath contact member, and at least the ends other than the four parts mentioned above are coated with a hard electrically insulating material. be.

Hereinafter, in order to clearly explain the effects of the present invention, specific embodiments and conventional examples will be explained in the case of resistance welding the welding material to the pewter.

Embodiment As shown in FIG. 1, a spherical concave portion 2 with an opening diameter of 2 mm and a length of 1 mm is provided to hold down the entire IK contact material on the tip surface, and the outer surface of the tip portion excluding the concave portion 2 is KA1. Using a resistance welding electrode 4t made of Cr-Cu with a diameter of lesm and a height of 2o, coated with a hard electrical insulating material 3 plated to a thickness of 0.1mm, the diameter was 2m, as shown in Fig. 2. The entire contact material 5 made of approximately hemispherical Ag with a height of 1u is placed in the recess 2.
Press down to a thickness of 0.5 m, @5 m,
An electric contact 7 is obtained by attaching a resistor #1ll to one end of a base material 6 made of copper having a length of 15 mm and electrically insulating the part other than the recess 2 with the base material 6 with a hard electrical insulating material 3. Ta.

Conventional Example As shown in FIG. 3, a spherical recess 2' with an opening diameter of 15 m and a depth of 0.7 ms for holding down a piece of contact material on the tip surface 1K was provided.The original diameter was 10 m5. Length 20m0Cr'l-
.

- Using the resistance welding electrode 41 made of Cu, the fourth
A part of the IIJ material 5 made of approximately hemispherical Ag with a diameter of 2 mm and a height of 111 j as shown in the figure is pressed into the recess 2', and a phosphorus material with a thickness of 0.5 m, a width of 5 mm, and a length of 15 m is formed. One end of the base material 6 made of tubular steel was in contact with the WAK resistor #4 to obtain an electric contact 7.

When the quality of 100 electric contacts of the example and the conventional example thus obtained was inspected and the welding strength of the contact material was measured, the results shown in the table below were obtained.

*Contents of defective product: Melting from the #l contact part of the iI point material,
Contamination of the contact surface due to flying chips, tilting of the contact material, etc.As is clear from the table above, in the conventional electrical contact, melting comes out from the mis part of the contact material, and the contact surface is contaminated due to flying chips. Defective products with contamination, tilted contact materials, etc. will be sent to lOO Bicchu 3.
On the other hand, there were no such defective products in the electrical contacts t of the example, and it can be seen that the quality is excellent. Compared to the contact material in the electrical contact of Example 1, the welding strength of the contact material in the electrical contact of Example 1 is significantly higher and stable with less variation in the opening. I understand.

The electrical insulating material 3 may be provided only on the tip end surface of the resistance welding electrode 4 in the above embodiment. Kotora Denki i# again! ! Acupuncture material 3 tons
It is not limited to lj At 203, and may be other hard electrical insulating materials such as WC, and the method of applying it is not limited to plating, but may also be sputtering, ion blating, etc. 1. In addition, the thickness of the hard electrical insulating material 3 should be as thin as possible as long as it can withstand the pressure applied during resistance welding, and varies depending on the material EC. . Also, the material of the electrode eye/ficr
The material is not limited to -CuK, but may also be a material such as Ag-W.

The above details are as follows:
The entire subordinate member to be bathed is held down by the t-it electrode, and the electrode is electrically rutted in the bath welding state, so that the WL welding member is attached to the bath welded base material with resistance I.
Since we are welding, even if there is slight distortion or deformation in the workpiece, when welding f11, the fg contact surface will be completely bonded to the base metal welded.
<'lIj Resistance bath welding is carried out using the applied wiping motion, and a stable bath welding is carried out, melting from the fg welding area and scattering of dust.

Good quality with no inclination of the part to be spread, and the welding strength is localized.
Stable 71clll with little fluctuation! You can get the goods. Since the 17'c electric current is electrically insulated from the bath welding base material, the common flow can be followed only through the blade of the part to be welded.

Therefore, by flowing a suitable bath suitable for bath melting of the welded part by Joule heat, excellent effects such as the ability to use the bathtub electrical tube effectively without wasting it can be achieved.

Furthermore, the resistance bath contact electrode of the present invention is provided with a concave S at its tip to press down the entire bathed channel material, and at least the tip surface excluding the concave portion is coated with a hard electrically insulating material. Said uninvented resistance welding method.

It has the late advantage of being easy to perform.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of a resistor joint according to the present invention, and Fig. 2 is an electric contact made by resistance bath contacting a contact material to a base material using the resistor electrode. Fig. 1III is a vertical cross-section showing an example of the resistance welding method of the present invention, Fig. 3 is a cross-sectional view showing an example of a conventional resistance welding electrode, and Fig. 4 is a cross-sectional view showing an example of a conventional resistance welding electrode. An example of the conventional resistance welding method of making electrical contacts by resistance welding to composite materials *ml! II
It is a diagram. l... Tip surface, 2... Concavity, 3...
・・・Hard, L4 electricity removal test, 4...Resistance foil repair 'ton pole, 5...Contact month, 6...Base material,
7... Electric contact. Applicant: Tanaka*Kinrinki JK Co., Ltd. Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Scope of Claims] l) The entire member to be electrically connected is held down by an electrode, and the electrode is electrically insulated from the base material, and a resistance I is applied to the base material of the pipe to be welded.
A resistance welding method characterized by 11 contact. 2) A recess for holding down the entire welded member on the tip surface yc is provided, and at least a hard electrical insulating material is coated in the tip direction other than the NIJ concave portion.