Plate welding method adopting laser penetration

Abstract

The invention relates to a plate welding method adopting laser penetration. A laser welding head, a high-pressure gas column nozzle and a protective gas spraying pipe can move relative to base materials, when the temperature of the back surfaces of the base materials reaches or exceeds a gasification temperature value of the base materials, the laser welding head and the high-pressure gas column nozzle are rotated, so that the laser welding head is inclined relative to the upper surfaces of the base materials, and the high-pressure gas column nozzle is in vertical alignment with the upper surfaces of the base materials; and a gas supply valve of the high-pressure gas column nozzle is controlled so that inert gas columns can be sprayed by the high-pressure gas column nozzle to penetrate through welding keyholes. The invention further relates to a laser welding system, and the laser welding head and the high-pressure gas column nozzle can move relative to the base materials so that the laser welding head and the high-pressure gas column nozzle can be switched between a first state and a second state. According to the plate welding method adopting laser penetration, high-pressure superfine gas columns are adopted to assist in maintaining the keyholes, so that discontinuous penetration of the keyholes and the loss of laser energy overflow in the penetration welding process are avoided, and the stability of the keyholes and the energy utilization rate are improved.

Description

technical field [0001] The present invention relates to a laser welding method, in particular to a laser penetration welding plate method. Background technique [0002] Laser welding is one of the most widely used advanced processes in laser processing technology. It has the advantages of easy manipulation of welding heat source, simple control, small deformation of weldment, narrow heat-affected zone, low residual stress, high accuracy and automation. It has been applied in important industries of the national economy such as automobiles, shipbuilding, nuclear power, and pipelines. [0003] With the continuous commercialization of ultra-high-power and high-brightness lasers, laser single-pass welding of medium and thick plates has received more and more attention. Laser welding of medium and thick plates is usually a laser deep penetration welding mode. In this mode, the material is melted or even gasified under the direct irradiation of the high-energy-density laser, and...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of poor welding stability and waste of laser power when small holes penetrate in the process of high-power laser deep penetration welding of medium and thick plates, and provide a laser penetrating laser with good welding stability and high laser utilization rate. Through Welding Plate Method

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