摘要:
采用激光焊、80% Ar+20% CO2混合气体保护焊匹配CHW-60C焊丝,对HR800CP复相高强钢板进行了焊接,对其焊接接头的显微组织与力学性能进行了研究。结果表明:激光焊缝的焊缝中心和热影响区组织为马氏体和贝氏体,焊缝中心和热影响区硬度值均高于母材,弯曲180°时未出现沿焊缝的开裂情况,接头抗拉强度为799 MPa,低于母材的抗拉强度,原因是焊缝的表面有凹陷。混合气体保护焊接头焊缝组织为针状铁素体、块状铁素体,粗晶区组织为板条状马氏体+贝氏体组织,正火区组织以贝氏体为主,熔合线附近存在相对较软的区域,接头的抗拉强度755 MPa,低于母材的抗拉强度。
Abstract:
HR800 CP multiphase high strength steel was welded with laser welding and 80%Ar+20%CO2gas-shield welding（MAG）with CHW-60 C welding wire.Microstructures and mechanical properties of the joints were studied.The result shows that,the microstructure of the weld center and the heat affected zone withlaser weldingare martensitic and bainite,the hardness of the weld center and the heat affected zone is higher than that of the base metal,there is no cracking along the weld seam while the bending degreeis 180°,the tensile strength of the joint is 799 MPa,which is lower than the base metal,because the pit on laser welding seam.For MAG welding,the microstructure of weld center are acicular ferrite and massive ferrite,while the coarse grain zone is comprised of lath martensitic and bainite.Bainite dominates the normalizing region,there is relatively soft area near the fusion line,and the tensile strength of the joint is 755 MPa,which is lower than the base metal too.
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