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Method for improving strength and flexibility of super strength steel laser-arc hybrid welded joint

A technology of ultra-high-strength steel and composite welding, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc. Solve problems such as large seam heat-affected zone, and achieve the effect of improving microstructure, capacity and service reliability, and stabilizing the composite welding process

Inactive Publication Date: 2013-01-02
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

[0002] In the process of welding large-thickness ultra-high-strength steel plates using conventional MAG / MIG welding processes, due to the large heat input, the heat-affected zone of the weld is large, and the grains in the heat-affected zone are coarse, so the strength and toughness of the welded joint decrease
In the process of welding large-thickness ultra-high-strength steel plates using laser-arc hybrid welding technology, the grains in the heat-affected zone of welding grow seriously; in addition, due to the addition of laser, the joints of the two workpieces to be welded are subjected to high temperatures locally, due to the heat along the The uneven distribution of the weld penetration direction leads to a very large difference in the structure and mechanical behavior of the formed welded joint and the base metal, which directly affects the fracture resistance behavior, capacity and service reliability of the welded joint. Directly related to the strength and toughness of welded joints

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  • Method for improving strength and flexibility of super strength steel laser-arc hybrid welded joint

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Embodiment Construction

[0007] The specific implementation of the method for improving the strength and toughness of ultra-high strength steel laser-arc hybrid welding joints of the present invention is as follows. First, the pretreatment laser 1 is used to pretreat the joint surface 3 of the two workpieces 2 to be welded to form a laser fusion pretreatment area 4, such as figure 1 shown. The workpiece 2 to be welded is ultra-high strength steel with a thickness of 8 mm and a tensile strength of 600 MPa. The pretreatment laser 1 comes from a Nd:YAG laser with a maximum output power of 4kW and an output wavelength of 1.06μm. It outputs a continuous wave laser. It uses a focusing lens with a focal length of 175 and a defocus of -3 mm. Pretreatment laser 1 power 2~3 kW, scan rate v 1 The scanning overlap rate is 1.5~2.5 m / min, and the scanning overlap rate is 25~35%. 1 Reciprocating movement, the percentage of the overlapping path formed by the preprocessing laser 1 approaching and leaving the recipr...

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Abstract

The invention discloses a method for improving strength and flexibility of a super strength steel laser-arc hybrid welded joint, belonging to the technical field of super strength steel welding. The welded joint in the conventional welding technology is low in strength and poor in flexibility. The method for improving strength and flexibility of super strength steel laser-arc hybrid welded joint provided by the invention is characterized by comprising the following steps of: firstly, fusing the to-be-connected surfaces of two to-be-welded work pieces in advance by adopting a preprocessing laser to form a laser fusion preprocessing region, wherein the preprocessing laser power is 2-3kW, the scanning speed v1 is 1.5-2.5m / min, and the scanning overlap rate is 25-35%; and then, butting the fused to-be-connected surfaces of the two to-be-welded work pieces, and welding the to-be-connected surfaces by laser-arc hybrid welding. The method provided by the invention is used for butting welding of high-thickness super strength steel plates, and can improve the strength of the welded joint and improve the flexibility of the welded joint.

Description

technical field [0001] The invention relates to a method for improving the strength and toughness of an ultra-high-strength steel laser-arc hybrid welding joint, which can improve the welding quality. For example, to improve the strength and toughness of an ultra-high-strength steel laser-arc hybrid welding joint, the end face of the weldment to be welded is firstly treated The laser melting pretreatment is carried out, the grain size in the laser melting pretreatment area is significantly reduced, and the grains are refined, and then the laser-arc composite heat source is used for welding, and the fusion line of the composite welding joint is located in the laser melting In the pretreatment area, the method belongs to the technical field of ultra-high strength steel welding. Background technique [0002] In the process of welding large-thickness ultra-high-strength steel plates using conventional MAG / MIG welding processes, due to the large heat input, the heat-affected zone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K26/348
Inventor 刘双宇张宏石岩刘凤德徐春鹰刘佳
Owner CHANGCHUN UNIV OF SCI & TECH
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