Double-phase stainless steel welding method and welding system for adjusting two-phase proportion

Abstract

The invention provides a double-phase stainless steel welding method and welding system for adjusting a two-phase proportion. The method comprises the following steps: pretreating the surface of a double-phase stainless steel workpiece to be welded; applying an alternating magnetic field to the double-phase stainless steel workpiece to be welded through magnetic field equipment; and conducting laser welding on the double-phase stainless steel workpiece to be welded through a laser device, and achieving double-phase proportion adjustment of the double-phase stainless steel workpiece to be welded under the action of the alternating magnetic field. According to the method, a magnetic field interacting with molten pool metal fluid, plasma arc and light-induced plasma is generated in a non-contact mode, stirring of a molten pool is achieved, the internal form of a welding seam can be effectively improved, tissue distribution can be reasonably adjusted, segregation of alloy elements in the welding seam is reduced, cracks are restrained, and meanwhile, the weld joint structure performance and the production efficiency are improved, and the problem of double-phase proportion imbalance after double-phase stainless steel welding is effectively solved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a duplex stainless steel welding method and a welding system for adjusting the ratio of two phases. Background technique [0002] At present, due to its excellent mechanical properties, physical properties and corrosion resistance, duplex stainless steel is widely used in highly corrosive environments such as nuclear power, chemical industry and coastal infrastructure. Laser welding is a common processing technology in the application process of duplex stainless steel. However, when the existing laser welding technology welds duplex stainless steel, excessive welding heat input will seriously cause serious damage to the microstructure distribution and phase composition of the welded joint of duplex stainless steel. Influenced, the dual-phase ratio of ferrite and austenite is unbalanced, which reduces the comprehensive performance of welded joints. Contents of the invention ...

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Problems solved by technology

[0003] The invention provides a duplex stainless steel welding method for adjusting the ratio of two phases, which is used to solve the imbalance of the duplex ratio of ferrite and austenite in the laser welding technology in the prior art, which reduces the For defects in the comprehensive performance of welded joints, the magnetic field that interacts with the molten pool metal fluid, plasma arc, and photoinduced plasma in a non-contact manner can realize the stirring of the molten pool, which can effectively improve the internal shape of the weld and make reasonable adjustments. Structure distribution, and to reduce the segregation of alloy elements in the weld, suppress cracks, improve the weld structure and production efficiency, and effectively overcome the problem of dual-phase ratio imbalance after duplex stainless steel welding

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