JPH03110090A - Method for welding insulating coated metallic member - Google Patents

Abstract

PURPOSE:To assure melting and joining and to stabilize joint strength by irradiating the insulation coating in the joint part of a metallic member with a laser beam and removing the insulation coating, then superposing the metallic member to be joined on the joint part and irradiating the joint part with the laser beam from above. CONSTITUTION:The insulation coating 3 splashes partially and a metallic base material 2 is partly exposed and a recess 6 is generated when the coating 3 is irradiated with the laser beam 7 focused to the joint part 5 of the insulation coated metallic member 1. The metallic member 4 to be welded is imposed and positioned on the metallic member 1. Both the metallic member 4 and the base material 2 are partially melted and joined and the weld zone 8 is formed when the metallic member 4 is irradiated with the laser beam 7 from above this member while the focal point of the laser beam 7 is held matched with the joint part 5. The hindrance of the absorption of the laser beam by the insulation coating is obviated in this way and the sufficient penetration state is obtd. The stable joint strength is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for welding an insulating coated metal member by welding together an insulating coated metal member and another metal member to be welded.

[Conventional technology]

In general, armatures, yokes, etc. of relays are made of metal members, and the fully bent members are parts that repeatedly rub against each other and collide with each other.
There is a problem in that the surfaces of the metal members wear against each other and metal powder is generated, resulting in poor contact.

Therefore, in order to prevent the generation of these metal powders, metal members are coated with resin containing fluorine, Teflon, etc. However, when applying the resin coating to a metal member, when joining another member such as a hinge spring by welding,
Resistance welding is not possible because the sheathing material is made of an insulating material. Therefore, in many cases, metal members are partially coated only where necessary.

[Problem to be solved by the invention]

The partial coating method described in the conventional example has the advantage of preventing the generation of abrasion powder from metal parts, but it has poor workability and increases cost. :1-Ting itself cannot be performed.

As a possible improvement measure, a metal plate such as a thin plate may be stacked on an insulating coated metal member, and the two members may be welded by directly irradiating a laser beam from the thin metal plate side. Therefore, we actually tried a welding method that directly irradiated the laser beam, but there was a problem that the insulating coating layer did not absorb light well and the bonding strength varied greatly.

The present invention aims to improve the above-mentioned problems, and its purpose is to provide a welding method for insulation-coated metal members that can provide stable joint strength when welding using laser beams. It is on offer.

[Means to solve the problem]

In order to solve the problem of unstable joint strength, the present invention first irradiates the insulation coating of the joint part with a laser beam to remove the insulation coating, and then overlaps the metal member to be welded on the joint part. This is then irradiated with a laser beam to perform welding.

[For production]

After removing the insulation coating at the joint part using a laser beam, the metal part to be welded is overlapped with the insulation coating metal part and welding is performed, so that the laser beam irradiated to the joint part can be It is effectively absorbed into the metal member without being absorbed by the metal member, ensuring fusion bonding at the joint and stabilizing the joint strength.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in Fig. 1, reference numeral 1 denotes an insulation-coated metal member, in which an insulation coating 3 (for example, Teflon coating with a thickness of 5 microns) is applied to the entire surface of a metal base material 2 (for example, 5UYP...spring steel). , used for electromagnets and relay amateurs, etc. Reference numeral 4 denotes a metal member to be welded, which is made of a stainless steel thin plate (0.05 mm thick) and is used for electromagnets, relay contact springs, etc.

The welding equipment in the embodiment of the present invention uses a YAG laser and φ0.2 SI fiber, and the welding conditions are a voltage of 450 V for both insulation coating removal and main welding.
2ms (0.85J), day focus 2.
It was set as 5■.

First, as shown in FIG. 1 (1), an insulated metal member!
When the laser beam 7 is irradiated onto the insulating coating 3 by aligning the point f with the joint 5 of Next, as shown in FIG.
Place and position. At this time, the focus of the laser beam 7 remains on the joint 5 as described above, so when the laser beam 7 is irradiated from above the metal member 4 to be welded, as shown in the same figure (TV), the metal member 4 and the metal base material 2 are partially fused and joined together to form a nugget (welded part) 8 as shown in FIG.

Figure 2 shows a cut in the center of the part welded under the above conditions.
This is a micrograph showing an enlarged cross-section of the weld. The welding result was extremely good, and a nugget 8 was formed, which is equivalent to welding metal members without insulation coating, and sufficient and stable joint strength was obtained. .

According to the above embodiment, after the insulating coated metal member 1 is positioned and fixed under the focal point of the laser beam 7, the insulating cover 3 is removed and the to-be-welded metal member 4 is placed in the same position. It is not necessary to focus the laser beam 7 during welding, and welding work can be performed efficiently.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be adopted in various ways.

〔Effect of the invention〕

As explained above, the present invention irradiates the insulation coating of the joint portion of metal members with a laser beam to remove the insulation coating, and then the metal member to be welded is placed on the joint portion, and the laser beam is applied to the joint portion of the metal member to be welded. Since this is a method of welding by irradiating laser beams, absorption of the laser beam is not hindered by the insulating coating, sufficient weld penetration is obtained, easy fusion bonding is achieved, and sufficient and stable bonding strength is obtained. It will be done.

It is a welding work process chart.

FIG. 2 is an enlarged cross-sectional view of a joint of a member welded by the method of the present invention.

Insulated metal parts, insulation coating, metal parts to be welded, joint, laser beam.

Claims (1)

[Claims] (1). When joining an insulating coated metal member to another metal member, the insulating coating at the joint is irradiated with a laser beam to remove the insulation coating, and then the metal member to be welded is placed over the joint. A method for welding insulating coated metal members, which comprises irradiating a joint portion of the metal members to be welded with a laser beam.