Principle: The laser welding machine workpiece absorbs the laser and quickly melts into gasification. The molten metal forms a small hole under the action of steam pressure. tension and gravity balance. This welding mode has a large penetration depth and a large aspect ratio. When the small hole moves along the welding direction with the laser beam, the molten metal in front of the small hole of the laser welding machine bypasses the small hole and flows to the rear, and forms a weld after solidification.
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1. Regularly inspect and replace the laser contact tip Due to the enlarged aperture of the worn contact tip, the arc will be unstable, the appearance of the weld will deteriorate or the wire will stick (burn back); the end of the contact tip will stick to the spatter, and the wire feeding will become uneven; the contact tip will not be tightened tightly. The threaded connection will heat up and be welded dead.
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First of all, special attention should be paid to the fact that when the internal or external inspection of the welding machine is carried out, the power switch must be turned off before implementation.
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1. In the process of operating the laser welding machine, in case of emergency (water leakage, abnormal sound of the laser, etc.), press the emergency stop immediately and quickly turn off the power supply;
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The principle of laser welding with filler wire is shown in following photo. The focused laser pot is directly irradiated on the wire, and the wire melts when it enters the area to be welded. In order to protect the processing area and control the photoplasma between the workpieces, it is also necessary to blow the shielding gas into the laser beam, welding wire and the working part of the workpiece. At the same time, in order to achieve single-sided welding and both-sided formation, back protection is also necessary.
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During laser welding, protection gases such as Argon, Helium, and Nitrogen are often used to protect the molten pool to protect the workpiece from oxidation during the welding process.
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