Method for welding high-strength steel through laser welding machine

Abstract

The invention discloses a method for welding high-strength steel through a laser welding machine. The welding method includes the steps of clamping of strip steel to be welded, conventional shearing, slight moving of a lap joint platform to determine shear amount of secondary shearing, secondary shearing, butt-joint of the strip steel on the lap joint platform, high-power vacuum annealing, smoothening, compressed air cooling, preheating, pre-smoothening, laser connection welding, secondary high-power annealing, smoothening, welding finishing and the like. The quality of the shearing surface of the strip steel is improved through the secondary shearing; yield strength can be reduced through the high-power vacuum annealing, the plate form of the strip steel in the welding region can be effectively improved, and material grains can be improved; material of the strip steel in the welding region can be improved through the air cooling, and thus fracture of welding joints in a thermoinduction region can be effectively avoided.

Description

technical field [0001] The invention relates to continuous casting control technology, more specifically, relates to a welding method for welding high-strength steel with a laser welding machine. Background technique [0002] The welding machine of the acid tandem rolling unit in the cold rolling enterprise adopts a laser welding machine. When the acid tandem rolling unit produces high-strength steel with a strength greater than 80 kg, the laser welding machine adopts the following steps for welding: clamping the strip to be welded, conventional shearing The welding process of cutting, lapping of lapping table, pre-induction heating treatment, pre-leveling wheel leveling, laser beam conduction for welding, annealing device for annealing the weld seam, and post-leveling wheel for final leveling of the weld seam, see figure 1 . The welds welded by this welding process can be judged and analyzed from the weld quality detector QCDS to meet the production requirements. The qual...

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Problems solved by technology

The welds welded by this welding process can be judged and analyzed from the weld quality detector QCDS to meet the production requirements. The quality of the destructive back protrusion test on the testing machine for checking the quality of the weld seam at the deformed part of the bulge is also normal, but it is easy The thermal induction zone of the weld seam (the joint between the molten area and the unmelted area forming the weld seam, generally about 2mm in width) breaks at the four racks, which leads to the problem of broken belt, which seriously affects the normal production of the unit

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