Compound welding method by using semiconductor laser and CO2 laser

Abstract

A compound welding method by using semiconductor laser and CO2 laser comprises the steps: using a semiconductor laser and a CO2 laser to be positioned on one side of a welding line of welded metals in a certain angle, adjusting a focusing position of the CO2 laser to cause a light spot of the CO2 laser to be positioned in the light spot of the semiconductor laser so that the welding direction is consistent with the slow axis direction of the semiconductor laser; using the semiconductor laser to pre-heat the welded metals, heating the part to be welded entering into the light spot of the semiconductor laser to 200-400 DEG C, using the CO2 laser to weld, and performing a post-welding thermal treatment to the welded metals by using the semiconductor laser for the welded parts of the welded metals welded by the welding of the CO2 laser. Due to synchronous pre-heating and post-heating treatments to the welding process, the invention can effectively solve the problem of cold cracking in high-strength steel welding and improve the quality of high-strength steel laser welding.

Description

technical field [0001] The invention relates to the field of laser applications, in particular to a semiconductor laser and CO 2 Laser hybrid welding method. Background technique [0002] At present, the automobile industry has entered the fast lane of development, and the automobile industry has higher and higher requirements for lightweight, safety, emission, cost control and fuel economy. Improving the safety and collision function of automobiles Although adopting greater mass and installing more safety devices and means can also make automobiles safer, it is contrary to reducing fuel consumption and emissions; in order to make automobiles reduce emissions and have better fuel economy performance, it must be lightweight. The use of high-strength steel plates can not only reduce the weight of the car, reduce fuel consumption while reducing emissions, but also improve the safety of the car. With the development of the automobile industry, there are more and more applicat...

AI Technical Summary

Problems solved by technology

The common disadvantages of traditional welding methods: slow welding speed, difficulty in obtaining large penetration depth and large heat-affected zone, etc., have become increasingly unable to meet the needs of high-speed, high-quality modern production, so it is urgent to find a new welding method

[0007] 1. The obvious growth of austenite in the weld metal makes the joint appear hardenable structure

[0008] 2. The martensitic structure that appears in the heat-affected zone increases the strength while reducing the toughness, which increases the possibility of cold cracks

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