JPS6037180Y2 - Laser welding equipment - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a laser welding device.

Conventionally, copper, aluminum, etc. have good thermal conductivity, and CO2
For butt welding of materials that are difficult to absorb laser light with a wavelength of 10.6 μm, such as a laser, a material with a relatively high melting point and good absorption of laser light, such as a nickel plate or iron plate, is inserted into the butt part. , a method has been proposed in which these materials are melted with laser light and the melting heat is used to indirectly melt and join materials such as copper.

However, in laser welding, welding is performed not by heat conduction in the lateral direction but by heat conduction in the depth direction, so it has been extremely difficult to find the welding conditions for the above-mentioned welding.

This idea was devised in view of the above points, and is designed to obtain a strong weld by placing an auxiliary material above the butt of materials that are difficult to laser weld.

This invention will be explained below based on drawings showing examples.

In the figure, 1 is CO.

A CO2 laser beam emitted from a laser oscillator (not shown) is condensed by a condensing lens 4 so as to condense the laser beam onto the abutting portion 3 of the objects to be welded 2a and 2b made of copper.

Further, on the abutting portion 3, a ribbon-like member 6 is disposed that intermittently holds small pieces 5 that are completely melted by the focused spot of the upper laser beam.

This ribbon-like member 6 is attached to a feeding mechanism 7 and is wound up by a winding mechanism 8.

Reference numeral 9 denotes a presser mechanism, the tip of which is formed into a bifurcated abutment 11 for holding the holding portion 10 around the small piece 5 in between.

In this case, the material of the abutment tool 11 is preferably a heat-resistant material such as ceramic.

With the above configuration, welding using laser light is performed as follows.

That is, if the laser beam 1 is irradiated toward the small piece 5 while the ribbon-like member 6 is pressed against the abutting portion 3 with the abutting tool 11, the objects to be welded 2a and 2b will be indirectly melted by melting the small piece 5. A partial joint 12 is obtained.

Therefore, the objects to be welded 2a, 2b and the ribbon-like member 6
If the pieces 5 are fed in steps at a constant pitch, the abutting tool 11 is actuated in accordance with the feeding, and the laser beam 1 is pulsed (or intermittent irradiated by a shutter) to melt the pieces 5 one after another. , a large number of joints 12 are obtained, and the objects to be welded 2a, 2b are spot welded as shown.

Incidentally, in the above embodiment, an example of spot welding is shown, but if a linear material is placed on the butt portion 3, seam welding can also be performed.

[Brief explanation of the drawing]

The drawing is a perspective view showing an embodiment of this invention. 1...Laser beam, 2a, 2b...Work to be welded, 5...Small piece, 9...Press mechanism.

Claims (1)

[Scope of utility model registration request] A moving table on which the workpiece is placed and fed step by step;
A ribbon-shaped auxiliary member intermittently holds a large number of small pieces that can be wound up and made of a material that is completely melted by laser beam irradiation and has a higher moisture absorption rate for laser light than the welded part, and the above-mentioned auxiliary member. a mechanism for feeding the small piece in steps in response to the step movement of the moving table; a presser for pressing the small piece holding portion of the auxiliary member so as to bring the small piece into close contact with the part to be welded; A laser welding device comprising: an irradiation device that irradiates a small piece placed on a part to be welded with a focused laser beam.