JPH0335509Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Summary] It is a laser welding fixed structure, and when two metal members are temporarily fixed with a low viscosity adhesive and then laser welded at multiple points on the outer periphery of the abutting surfaces. By providing a groove in at least one of the grooves to prevent the adhesive from entering the adhesive, deterioration in welding quality due to evaporation of the adhesive can be prevented.

[Industrial application field]

The present invention relates to a laser welding fixing structure applied to precision parts such as optical parts.

[Conventional technology]

Conventionally, when joining a member 2 holding an optical fiber 1 and a member 4 holding a lens 3 as shown in FIG. 4, after adjusting the optical axis between the two members, a low viscosity adhesive ( For example, they were temporarily fixed using a cyanoacrylate adhesive), and laser welding was performed at multiple locations on the outer periphery of the abutting surfaces 5.

[Problem that the invention attempts to solve]

In this laser welding fixing structure, since the abutting surfaces 5 of the members are composed of unbroken planes, the low viscosity adhesive used for temporary fixing spreads over the entire area of the abutting surfaces, which absorbs the heat generated during laser welding. It has the disadvantage that it vaporizes due to the influence of water and causes welding defects.

The present invention was devised in view of these points, and an object thereof is to provide a laser welding fixing structure that has a simple configuration and can prevent welding defects due to adhesive vaporization.

[Means for solving problems]

Therefore, in the present invention, two metal members 1
0 and 14 are abutted and temporarily fixed with a low viscosity adhesive, and laser welding is performed at multiple locations on the outer periphery of the abutting surfaces 11.
Abutment surface 11 of at least one metal member 10
It is characterized in that a groove 12 is provided in order to prevent the adhesive from going around to the part to be welded.

[Effect]

On the abutting surface of at least one of the two members,
By providing a groove to prevent the adhesive from going around to the area to be laser welded, the low viscosity adhesive used for temporary fixing will not go around to the area to be welded, thus preventing the adhesive from vaporizing during laser welding. , the occurrence of welding defects is prevented.

〔Example〕

1 and 2 are diagrams for explaining an embodiment of the present invention, FIG. 1a is a sectional view showing one of the two metal members, and FIG. 1b is a sectional view of FIG. 1a. Z
The arrow view and FIG. 2 are perspective views showing two metal members after welding.

In this embodiment, as shown in FIG. 1, two vertical and horizontal grooves 12 are provided on the abutting surface 11 of one metal member 10, and the surface in contact with the outer periphery is divided into eight areas a to h. Then, after applying a low viscosity adhesive to the four surfaces a, c, e, and g of the adhesive surface 11 thus formed, and temporarily adhering the other metal member 14 as shown in FIG. The outer peripheral portions B, D, F, and H of the four surfaces d, f, and h are welded using a laser.

According to this embodiment, when the low viscosity adhesive is applied to the adhesive surfaces a, c, e, and g, the surfaces b,
Since the groove 12 prevents the adhesive from going around to the parts d, f, and h, there is no evaporation of the adhesive even if the outer circumferences of the parts b, d, f, and h are welded. No welding defects will occur.

Note that the groove 12 is particularly effective for preventing the low-viscosity adhesive from going around when the abutting surfaces of two metal members are brought into contact and a low-viscosity adhesive is injected from the outer periphery using capillary action.

FIG. 3 is a diagram showing another embodiment.

The difference between this embodiment and the previous embodiment is that grooves 12 that prevent the adhesive from going around are provided so as to divide the outer circumference of the butting surface 11 into eight equal parts, and the effect is the same as that of the previous embodiment. be.

[Effect of idea]

As described above, according to the present invention, it is possible to prevent welding defects due to adhesive vaporization with an extremely simple configuration, and it is extremely useful in practice.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams for explaining an embodiment of the present invention, Figure 3 is a diagram showing another embodiment of the invention, and Figure 4 is a diagram for explaining a conventional laser welding structure. It is. In Figures 1, 2, and 3, 10, 14
...Metal member, 11...Abutting surface, 12...Groove.

Claims (1)

[Claims for Utility Model Registration] In a laser welding fixing structure in which two metal members 10 and 14 are abutted and temporarily fixed with a low viscosity adhesive, and multiple points on the outer periphery of the abutting surfaces 11 are laser welded, Abutment surface 1 of at least one metal member 10
Groove 1 to prevent adhesive from getting around to the area to be welded
A laser welded fixing structure characterized by having 2.