JP3051825B2 - How to attach electrical contacts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting an electric contact used on an electric component (for example, a thermostat).

[0002]

2. Description of the Related Art A contact portion of an electric component is sometimes made by attaching a contact material to a base plate. In the prior art, this attachment is performed by a method of crimping the contact material to the base plate or a method of resistance welding such as spot welding.

[0003]

The contact by crimping is easy to provide a mechanical holding strength, but has a low degree of electrical connection, and when a large current is applied, the contact at the connection portion between the contact material and the base plate. Resistance sometimes occurred.

[0004] In addition, although the degree of electrical joining is high in a welding contact point and a relatively large current does not cause a problem at the joining portion, the setting and management of welding conditions with respect to mechanical holding strength are sufficient. Must be done. Mechanical strength has a contradictory aspect that it cannot be sufficiently evaluated without destructive inspection.

[0005] In resistance welding such as spot welding, there is also a problem that the nugget of welding is located between the joining surfaces and cannot be observed from the outside, and it is difficult to find defective welding.

SUMMARY OF THE INVENTION It is an object of the present invention to propose a method for mounting an electrical contact, which has a sufficient mechanical strength for electrical contact, a high degree of electrical connection, and a high reliability of a welded portion.

[0007]

An object of the present invention is to provide a method of mounting an electric contact, comprising a step A of fixing a contact material to a base plate and a step B of laser welding the base plate and the contact material to each other. Solved by

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment, the step A is performed in a pressure bonding step, and the step B is performed after the step A. In the second embodiment, the step A is performed in a pressure bonding step, and the step A is performed after the step B. In the third embodiment, the process A is performed by resistance welding, and the process B is performed.
Is performed after step A.

[0009] There are various modes of laser welding of the base plate and the contact material. For example, welding the enormous part when the contact material is crimped to the base plate, welding the head or trunk of the contact material to the base plate, or using the contact material from the contact part and the base material that supports it It is also possible to weld between one of them and the base plate.

The base plate and the contact material are laser-welded at least at one point, but can also be carried out, for example, over the entire circumference of the enlarged part.

In the first mode and the second mode,
The crimping process guarantees the mechanical strength of the connection between the base plate and the contact material, and the laser welding ensures the electrical connection between the base plate and the contact material.

In a resistance welding such as spot welding, a nugget exists between joining surfaces, and it is generally difficult to inspect the quality of the welding. However, in the third form,
Since the laser weld can be observed from the outside, it is easy to inspect the quality of the weld, and the reliability of the weld can be increased.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a base plate 1 made of an electric conductor provided with a hole, a contact material 2 made of a relatively soft electric conductor having electrical and chemical durability is inserted into the hole, and a crimping step is performed. FIG. 7 is a cross-sectional view when a first step of fixing the contact material 2 to the base plate 1 has been completed.

The crimping process deforms the contact material 2 and mechanically fixes the contact material 2 to the base plate 1, and it can be seen that the contact material 2 is electrically and also joined to the base plate 1.

However, it is preferable to make the electrical contact between the base plate 1 and the contact material 2 more secure.

FIG. 2 is a cross-sectional view when laser welding is performed between the base plate 1 and the periphery of the projection 2b on the back side of the contact portion 2a of the contact material 2 and the base plate 1 in FIG. Contact material 2 and base plate 1
A laser weld 3a is formed between the two, and the two are electrically and reliably joined. In addition, it is easy to inspect the quality of welding.

FIG. 3 is a sectional view when laser welding is performed between the base plate 1 and the periphery of the contact portion 2a of the contact material 2 and the base plate 1 in FIG. As in FIG. 2, the laser welded portion 3b is formed, and it is easy to inspect the quality of welding.

FIG. 4 shows that the base plate 1 is irradiated with a laser beam L from the back side of the contact portion 2a of the base plate 1 and the contact material 2 shown in FIG. Is a cross-sectional view when the base plate 1 and the contact material 2 are subjected to laser welding.

FIG. 5 shows the base plate 1 and the projection 2 of the contact material 2 shown in FIG.
It is the front view seen from b side. In this embodiment, the contact portion 2
Laser welded portions 3c are formed at four locations on the peripheral edge of a. Inspection of welding quality is also easy.

FIG. 6 shows a case where the contact material 2 is composed of the contact portion 2A and the base material 2B supporting the contact portion 2A. FIG. 4 is a cross-sectional view when a portion is laser-welded to a base plate 1. A laser weld 3d is formed as in the case of FIG.
Inspection of the weld 3d is also easy.

The bonding of the base plate 1 and the contact material 2 shown in FIGS. 2, 3, 4, 5, and 6 can also be performed by first performing laser welding and then performing a crimping step. .

FIG. 7 is a cross-sectional view when the contact material 2 is fixed to the base plate 1 by resistance welding such as spot welding and the peripheral portion of the contact material 3 is laser-welded to the base plate 1. The welding nugget 4 is located between the joining surfaces and cannot be observed from the outside. Since the laser weld 3e can be observed from the outside, it is easy to inspect the quality of welding. Further, since two types of welding are performed, the reliability of welding is high.

[0023]

【The invention's effect】

(1) In the case of the combination of the crimping step and the laser welding, the mechanical strength of the joint is large, and the electrical connection is ensured. In addition, it is easy to inspect the quality of welding. (2) When resistance welding such as spot welding and laser welding are combined, welding reliability is high and welding inspection is easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a base plate 1 and a contact material 2 when only a crimping step is performed.

FIG. 2 is a cross-sectional view of an example when laser welding is performed after the pressure bonding step of FIG.

FIG. 3 is a cross-sectional view of another example in which laser welding is performed after the pressure bonding step of FIG. 1;

FIG. 4 is a sectional view of still another example in which laser welding is performed after the pressure bonding step in FIG. 1;

FIG. 5 is a front view of FIG. 4;

6 is a cross-sectional view of the base plate and the contact material corresponding to FIG. 2 when the contact material 2A includes the contact portion 2A and the base material 2B.

FIG. 7 is a cross-sectional view of the base plate and the contact material when the base plate and the contact material are joined by resistance welding such as spot welding and then laser welding is performed.

[Explanation of symbols]

 1 Base plate 2 Contact material 2a Contact portion 2b Convex portion 2A Contact portion 2B Base material 3a, 3b, 3c, 3d, 3e Laser weld 4 Nugget

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 11/06

Claims (4)

(57) [Claims] A first material for inserting a contact material into a through hole of a base plate.
A second step of crimping the contact material to the base plate by pressing after the first step, and a third step of laser welding at least one point of the contact material to the base plate after the second step. A method for mounting an electrical contact, comprising the steps of: 2. At the time of the laser welding, the base plate is melted by a laser beam to form a through hole in the base plate, and the base plate and a part of the contact material are formed on the back surface of the laser irradiation surface of the base plate. The method of claim 1, wherein laser welding is performed. 3. A first method for inserting a contact material into a through hole of a base plate.
Caulking of the steps, by crimping a second step of laser welding to the base plate at least one point of the contact material after the first step, the contact material after the second step to the base plate
A method for mounting an electrical contact, comprising: 4. A method of fixing a contact material to a base plate by resistance welding .
Step 1 and improve the degree of electrical connection between the contact material and the base plate
A second step of laser welding at least one point of the contact material to the base plate after the first step.