A laser welding method for hot-rolled stainless steel

Abstract

The invention relates to a laser welding method for hot rolled stainless steel. The laser welding method comprises steps of clamping two pieces of to-be-welded strip steel, shearing welding ends of the two pieces of to-be-welded strip steel respectively, splicing the sheared two pieces of to-be-welded strip steel, welding the two pieces of to-be-welded strip steel using a laser arc composite welding technology, and carrying out annealing treatment on the weld joint zone. According to the method, the laser arc composite welding technology is applied to the welding production of hot rolled stainless steel, while a large depth of fusion is guaranteed, the depth of a molten pool is properly increased, solidification speed is reduced, so that thick crystal grains of a weld joint and heat affected zone can be diffused and refined, the extensibility and the toughness of the weld joint are improved, and the defects of low-temperature cracks and the like of the weld joint are avoided; in addition, the laser arc composite welding process is adopted, so that a larger depth of fusion and a larger welding speed can be obtained at a low laser power, the welding efficiency can be improved, and the cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of strip steel welding, and in particular relates to a laser welding method for hot-rolled stainless steel, in particular to a laser welding method for 400-series hot-rolled stainless steel. Background technique [0002] The stainless steel pickling mill uses a laser welder to weld the head and tail of the strip to ensure the continuity of the production line. The raw materials of the acid rolling unit come from hot-rolled stainless steel materials, among which 400 series hot-rolled stainless steel is difficult to weld. [0003] 400 series stainless steel is divided into martensitic and ferritic. When martensitic stainless steel is welded, there are brittleness, low-temperature toughness deterioration, and the decrease in ductility accompanying hardening. The structure of the welding heat-affected zone is usually hard and brittle. Ferritic stainless steel has good welding performance when the carbon conten...

AI Technical Summary

Problems solved by technology

Using this welding process to weld 400 series stainless steel welds, even if the surface shape is full, it cannot pass the cupping test on the weld quality inspection cupping test machine; when this kind of weld is rolled on a continuous rolling mill, it is prone to welding. Seam heat-sensitive zone fractures, resulting in broken bands

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