JPH0230158Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for welding thin plates made of magnetic material such as steel plates using a laser beam.

[Prior Art] Conventional welding equipment of this type abuts the ends of plate-shaped objects to be welded together and irradiates the abutted contact surfaces with a focused laser beam to perform welding. Instead of fixing the plate-like object, methods were used such as relying on the stability of the plate's own weight or mechanically clamping it. FIG. 2 is an example of a conventional mechanical clamp device, and FIG. 3 is a schematic diagram showing a case where both plate-like objects are not fixed. In the figure,
4, 4' are both plate-like objects to be butt welded, 9,
9' is a table that supports them, 12 and 12' are mechanical clamping devices, and 1 is a laser beam.
As is clear from the figure, conventionally, tables 9, 9'
Plates 4 and 4' may be placed on top and welded together, or the plates 4 and 4' may be pressed and fixed onto tables 9 and 9' by mechanical clamping devices 12 and 12', respectively. , was welding. However, these methods are intended for plate-like objects 4, 4' that are relatively thick (for example, 1 mm or more);
Ultra-thin plates with a thickness of 0.2 mm or less were not covered.

[Problems to be Solved by the Invention] As shown in FIG. 3, if the plates 4, 4' are not fixed, there will be a difference in the height of the groove to be welded. Particularly in the case of extremely thin plates with a thickness of 0.2 mm or less, the weight of the plates 4, 4' is light, so that differences in groove height are likely to occur due to deformation of the plates. Furthermore, it is necessary to make the gap at the groove butt part of an ultra-thin plate smaller (0.2 mm or less) than in the case of a plate-like object with a thickness of 1 mm or more.
Therefore, a device is required to accurately fix the plate-like objects 4, 4' to the welding device.

Next, when using mechanical clamping devices 12, 12' as shown in FIG. 2, this device itself becomes large and expensive, and the laser beam is It is not preferable to install this because it overlaps in position with the main components such as the beam nozzle that irradiates the beam. Also, if this mechanical clamping device 12, 12'
However, when fixing the plates 4, 4' with precision as described above, the
In the case of an extremely thin plate of 0.2 mm or less, the plate surface is likely to be deformed by the clamping pressure, and there is a problem in that it takes a lot of time and effort to adjust this pressure.

The present invention was made to solve these problems, and provides a welding device that can accurately perform laser beam welding of ultra-thin plates with a thickness of 0.2 mm or less, which was difficult to do with conventional welding devices. The purpose is to

[Means for Solving the Problem] The welding device according to this invention is a device that uses a laser beam to weld an abutment portion formed by abutting the end surfaces of two objects to be welded. A space is provided, and one piece is brought into contact with the back surface of both of the objects to be welded,
One or more electromagnets are provided to fix both objects to be welded when energized during welding.

[Function] Since the welding device of the present invention has the above-mentioned configuration, it is possible to reduce thickness, which was difficult with conventional devices.
Ultra-thin plate (e.g. steel plate) made of magnetic material with a diameter of 0.2 mm or less
When butt welding with laser beam welding, etc., the welding device is fixed to the welding device by passing current through an electromagnet installed on one side of the welding device, so its own weight is light and the plate surface Preferable fixing is performed on extremely thin plates that are easily deformed. Also,
Since a gap of a predetermined size is provided around the abutting portion, the extremely thin plate melted by laser beam welding does not adhere to the electromagnet.

[Embodiment of the invention] FIG. 1 shows an embodiment of the welding device of the invention.
Reference numerals 9 and 9' in the figure are tables, 8 is an electromagnet disposed on the table side, 10 is a power source thereof, and 11 is a switch provided in the circuit. 7 is a laser emitting device, 6 is a beam nozzle, 5 is a shielding gas inlet,
4 and 4' are plate-shaped objects to be welded, 3 is a condenser lens, 2 is a reflecting mirror, and 1 is a laser beam.

Next, a procedure for welding objects to be welded using the welding apparatus of the present invention will be described. First, the plate-shaped workpiece 4 to be welded is placed on the tables 9, 9'.
4', and after aligning both ends with the welding position, by turning on switch 11,
The objects to be welded 4, 4' are fixed to a welding device. Thereafter, a laser beam is irradiated onto the abutting portion, and the laser beam is irradiated by the laser generator 7 through the reflecting mirror 2 and condensed by the condensing lens 3. At this time, an inert gas such as argon is supplied together with the laser beam 1 from the shield gas inlet 5 and is injected from the beam nozzle 6 to prevent the atmosphere in the welding area from becoming an oxidizing atmosphere. etc. to be removed. In this way, welding is performed while moving the laser nozzle 6 along the welding line.

When the welding is completed, by turning off the switch 11, the objects 4, 4' to be welded are unlocked and taken out. In this case, the objects to be welded 4, 4' are placed on the table 9, without moving the laser nozzle 6.
There is no problem even if welding is carried out in a structure in which the part 9' is moved together with the part 9'.

[Effect of the invention] By using the welding device of the invention, the thickness
Butt laser beam welding of magnetic materials such as ultra-thin steel plates of 0.2 mm or less can be performed with high accuracy, and the molten steel plate does not adhere to the electromagnet.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing the configuration of an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view showing the fixation of a plate-like object by a conventional mechanical clamping device, and Fig. 3 is a longitudinal cross-sectional view showing the structure of an embodiment of the present invention. It is a longitudinal cross-sectional view showing a butt state of extremely thin plates. In the figure, 1 is a laser beam, 2 is a reflecting mirror, 3 is a condensing lens, 4 and 4' are objects to be welded, 5 is a shielding gas inlet, 6 is a beam nozzle, 7 is a laser emitting device, 8 is an electromagnet, and 9 , 9' is the table,
10 is a power supply, and 11 is a switch. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] In an apparatus for welding an abutment portion formed by abutting the end surfaces of two objects to be welded using a laser beam, a gap of a predetermined dimension is provided around the abutment portion, and a gap between the two objects is provided. A welding device characterized in that one or more electromagnets are disposed, one piece of which is brought into contact with the back surface of the objects to be welded, and which is energized during welding to fix both objects to be welded.