JPH01202385A - Laser welding method for metal plate - Google Patents

Abstract

PURPOSE:To easily form a weld zone of high reliability by cutting a pair of metal plates so as to become of the cutting part inclined at specified angle from the vertical direction by a laser beam respectively and joining these both cut faces by laser beam by abutting them. CONSTITUTION:A cutting face is obtd. by cutting a metal plate 1 by projecting a laser beam 3 thereon by inclining a laser nozzle 2 at 7-15 deg. from the vertical direction. The metal plates 1 and 4 having the out face are abutted so that the mutual cut faces are closely fitted, the laser beam 3 is projected on this abutting part with moving from the upper part and in the vertical direction for the paper face and a laser weld zone 5 is formed to weld both metal plates 1 and 4. The abutting weld zone improving the reliability can thus be easily obtd.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method of laser welding metal plates, and more particularly to butt welding of plates using a laser beam.

(Prior art) As is well known, laser machining uses a beam with high energy density, so depending on the machining conditions and laser selection, it can be applied to a wide variety of workpiece materials, and the same machining equipment can drill holes. Dawn.

It can perform different types of processing such as cutting, welding, and heat treatment, and since light can be focused as a minute spot on the processing surface, processing can be performed with less processing strain and thermal deformation, and since it does not require a vacuum, processing equipment can be simplified and work can be made easier. This is an excellent processing method that has never existed before.

By the way, when butt welding metal plates with a laser beam, the gap between the welding areas must be set to within about 0.1 # because the laser beam is focused by a lens and irradiated onto the welded area. If this dimension cannot be set, defects such as voids may occur in the welded portion, or welding may not be possible at all.

Therefore, in order to obtain sound butt welding using a laser beam, measures such as improving the cutting accuracy of the welding surface of the material and performing careful setting are required.

(Problem to be solved by the invention) However, in order to improve the cutting accuracy of materials, skill and long processing time are required, and careful setting requires special jigs and time. As the length of the weld becomes long, it is extremely difficult to butt weld materials with a particularly complicated shape using a laser beam, and there is a risk that the welded area may come loose.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for laser welding metal plates, which uses a laser beam and can easily obtain a sound butt weld without causing the above-mentioned problems.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides laser beams for each of a pair of metal plates from the vertical direction.
The cut surfaces are cut at a 15° inclination, the two cut surfaces are butted together so that they touch, and the abutted portion is irradiated with a laser beam to join them. This makes it possible to easily obtain a highly reliable welded joint by taking advantage of its properties.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First, as shown in Fig. 1, the method for processing a cut surface of a metal plate is to tilt a laser nozzle 2 (indicated by θ) onto a metal plate 1 and irradiate a laser beam 3 from the laser nozzle 2 to cut the metal plate. , obtain the cut surface.

This process is performed on both metal plates to be butt welded. However, it is assumed that the slopes of both cut surfaces correspond to each other. Note that 1a in the figure is a part that will be scrapped.

Next, as shown in FIG. 2, the metal plates 1 and 4 having the above-mentioned cut surfaces are butted together so that the cut surfaces are in close contact with each other, and a laser beam 3 is applied from above to this butted part. The laser beam is irradiated while moving in a direction perpendicular to the plane of the paper, forming a laser welding portion 5 and welding both metal plates 1 and 4 together.

In this case, welding can be performed even if the irradiation position of the laser beam is shifted left and right (δ) as shown in FIG. 3, and it is possible to avoid not being able to weld at all as in the conventional case shown in FIG.
Unsound welding can be avoided.

According to the research of the present inventors, when processing a cut surface with the above-mentioned laser beam, the inclination angle θ is possible to be 7 to 15 degrees, and preferably 7 to 10 degrees; For example, metal plates can be easily and sharply cut with a laser beam, and when butt welding plates with a thickness of 2 m, for example, even if the deviation (δ) of the laser beam is about 0.25#, it is still practical. It was possible to obtain a good welded part without any problems.

On the other hand, since the processing and welding of the above-mentioned cut surfaces are both performed using laser beams, there is no need to move the material to be welded between different processing sections, which prevents the complexity of the work process and loss of efficiency due to transportation. be able to.

In the above-mentioned embodiments, the type of laser beam used is not particularly limited, but C
It is desirable to use an O2 laser or the like.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to provide a laser welding method for metal plate materials that is easy and allows a butt welded portion with improved reliability to be obtained.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a cutting surface processing method in an embodiment of the present invention, Fig. 2 is an explanatory diagram showing a welding method in an embodiment of the present invention, and Fig. 3 is an explanatory diagram showing the effect of the embodiment of the present invention. The explanatory diagram, FIG. 4, is an explanatory diagram showing the drawbacks of the conventional welding method corresponding to FIG. 3. 1.4...Metal plate material 3...Laser beams 5.5a, 5b...Laser welding section (8733) Agent Patent attorney Yoshiaki Inomata (Idiot)
1 person) Figure 2 Figure 4

Claims (1)

[Claims] A pair of metal plates are each pierced with a laser beam from the vertical direction.
A metal plate material, characterized in that the cut surface is cut at an angle of ~15°, the two cut surfaces are abutted so as to contact each other, and the abutted portion is irradiated with the laser beam to be joined. butt welding method.