A kind of blank welding method of stainless steel composite plate

Abstract

The invention provides an assembly welding method of a stainless steel composite plate. The method is characterized in that when a stainless steel composite plate blank which is 100-500mm in thickness, not greater than 3mm in joint pairing gaps, and not greater than 5mm in misalignment, is subjected to assembly welding, a low-carbon steel continuous casting blank or a steel plate with the same quality is treated as a material of a base layer; an austenite or ferrite stainless steel plate is treated as the material of a cladding layer; fixing welding is carried out based on the sequence of processing short edges and then processing long edges and processing two sides and then processing the middle before continuous welding, thus inhibiting the welding deformation caused by continuous casting; a partial scanning technology is adopted in the continuous welding of the steel plate with the same quality, so that the problems of large pairing gaps and misalignment can be overcome; transverseoffset is added and the arc ending position is optimized during the continuous casting of the steel plate with different quality, so that the crack sensitivity of weld seams can be reduced. Accordingto the method, the welding position, the welding sequence and the welding parameters are optimally designed and adjusted, and thus the blanks with not greater than 5mm misalignment and not greater than 3mm pairing gap can be effectively subjected to assembly welding, and moreover, the crack sensitivity of the weld seams can be reduced, and the adverse effect of crater cracks on joints can be avoided.

Description

technical field [0001] The invention belongs to the blank preparation technology of the metallurgical industry composite plate, and in particular relates to a vacuum electron beam assembly blank welding method for austenitic or ferritic stainless steel composite plate blanks with low carbon steel or low alloy steel as the base material. Background technique [0002] Stainless steel clad plate is a kind of bimetal composite material composed of carbon steel base layer and stainless steel cladding layer in a certain way. In terms of performance, it not only has the characteristics of stainless steel wear resistance, corrosion resistance, oxidation resistance, and long service life, but also has the mechanical properties of carbon steel such as high strength, toughness, impact resistance, and stretchability. From an economic point of view, compared with pure stainless steel plates, stainless steel clad plates can save 70-80% of alloying elements such as chromium and nickel, the...

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of green, high-efficiency blank assembly welding method applied to the preparation of stainless steel composite slabs, to solve the problem of large misalignment of stainless steel composite slabs and the difficulty of welding in large group pair gaps, the tendency of weld cracks is relatively large and The problem of arc crater crack extension caused by excessive stress concentration after welding

Images