Method for welding boards through lasers

Abstract

The invention relates to the technical field of welding, in particular to a method for welding boards through lasers. The method for welding the boards through the lasers includes the steps that 1), an optical fiber laser unit is selected; 2), the two to-be-welded stainless steel boards are pre-treated; 3), welding portions of the two to-be-welded stainless steel boards are in lap joint; 4), the lap joint portions are subjected to penetration welding through the optical fiber laser unit, wherein the welding direction of the optical fiber laser unit is parallel to the wiredrawing direction of stainless steel; 5), multiple weld nuggets are formed along a welding path of the two to-be-welded stainless steel boards; 6), a certain weld nugget at the end serves as a welding starting point, welding at first laser power is adopted for the weld nugget, then the power is gradually increased to the second laser power, the power is gradually reduced to the first laser power on a next weld nugget,and the operation is repeated until the whole welding path is completed.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for laser welding plates. Background technique [0002] Laser is a kind of electromagnetic wave with good monochromaticity, good directionality, high brightness and good coherence due to stimulated radiation. Due to the above remarkable characteristics, the energy of the laser beam can be converged to a relatively small point , so that the power density on the workpiece can reach more than 107W / cm2. The incident power density of this order can vaporize the metal in the heating zone in a very short time, thus forming a small hole in the liquid molten pool, called the keyhole. The beam can directly enter the keyhole, and through the heat transfer of the keyhole, a larger welding penetration can be obtained. The essence of laser welding is the process of interaction between laser and non-transparent substances. This process is extremely complicated and is a quantum proce...

AI Technical Summary

Problems solved by technology

[0010] Compared with carbon steel, stainless steel has the characteristics of high strength, good weldability, easy cold working and no need for painting. The application range of thin-walled stainless steel plates is becoming wider and wider. Welding together has become an indispensable processing technology. At present, the welding of stainless steel plates usually adopts the resistance welding process. In actual production, the process of laser welding stainless steel plates is not used.