Welding method of composite steel plates

Abstract

The invention relates to a welding method of composite steel plates, is used for the field of welding of composite stainless steel plates. The composite plates are explosion-welded composite plates, base materials of the composite plates are Q345R, and composite materials are 316L heat-resistant stainless steel. The method includes the steps of groove machining, groove cleaning and plate combination, base layer welding of composite layer sides, welding of transition layers, welding of composite layers as well as welding of back base layers. According to the composite stainless steel plates welded with the technology, appearance of fissile and fragile structures during welding of the composite plates is avoided, welding cracks are avoided, the welding quality of the composite plates is improved, and the welding efficiency of the composite plates is improved.

Description

technical field [0001] The invention relates to a welding method of clad steel plates, which is mainly used in fields such as welding of stainless steel clad plates, so as to ensure the welding seam quality and welding efficiency of the clad plates. Background technique [0002] Stainless steel composite panels, especially heat-resistant stainless steel composite panels, are made of heat-resistant stainless steel and ordinary carbon steel Q345R through explosive welding, and are used to make pressure vessels used under high temperature conditions. The performance of anti-corrosion can also exert the strength and toughness of ordinary carbon steel, and it can also reduce the material cost compared with the pressure vessel made of pure thickened heat-resistant steel, but the quality of the welding seam of the composite plate is the key factor to ensure the safety of the pressure vessel. How to improve the quality and welding efficiency of composite plate welds is a relatively ...

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Problems solved by technology

[0002] Stainless steel composite panels, especially heat-resistant stainless steel composite panels, are made of heat-resistant stainless steel and ordinary carbon steel Q345R through explosive welding, and are used to make pressure vessels used under high temperature conditions. The performance of anti-corrosion can also exert the strength and toughness of ordinary carbon steel, and it can also reduce the material cost compared with the pressure vessel made of pure thickened heat-resistant steel, but the quality of the welding seam of the composite plate is the key factor to ensure the safety of the pressure vessel. How to improve the quality and welding efficiency of composite plate welds is a relatively complex system engineering

[0003] Composite plate welding belongs to the welding of dissimilar materials. The welding of dissimilar materials adopts layered welding, but a transition layer welding is required between the cladding layer and the base layer. The transition layer welding will easily lead to dilution and condensation of weld metal material elements, resulting in weld microstructure It is easy to form brittle structures such as martensite, which will lead to cracks in the welding process or subsequent high-temperature and high-pressure use, and the weld seam will fail. Therefore, in order to ensure the quality of the weld seam, most of the welding methods currently used are manual welding, which requires High-level skilled welding workers welding, high requirements for skilled workers, pure manual welding welding efficiency is low, and the number of high-tech welders is small, these factors limit the efficiency of heat-resistant steel clad plate welding and guarantee the quality of welds

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