Welding method of stainless steel plates

Abstract

The invention relates to the technical field of welding, in particular to a welding method of stainless steel plates. The welding method of the stainless steel plates comprises the steps that first, two stainless steel plates to be welded are subjected to pretreatment and preheating; then, the welded portions of the two stainless steel plates to be welded are overlapped to determine a welding path; and then chamfering and turning processing is performed on the joints of weld seams by following the welding path, then a fiber laser is used for performing through-welding of an overlapping portion, and the welding direction of the fiber laser is parallel to the wiredrawing direction of stainless steel; a plurality of spot weld nuggets are formed along the welding path of the two stainless steel plates to be welded; a spot weld nugget at the end portion is used as a welding starting point, first laser power is adopted to weld at the spot weld nugget, then the power is gradually increased tosecond laser power, the power is gradually reduced to the first laser power when reaching the next spot weld nugget, and the step is repeated until the entire welding path is completed; and finally,the stainless steel plates are subjected to heat treatment and cooling.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding method for stainless steel 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 qua...

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.