电焊机2024，Vol.54Issue(12)：62-67,6.DOI:10.7512/j.issn.1001-2303.2024.12.10
紫铜管半自动TIG电弧熔钎焊接头组织与性能研究
Research on the Microstructure and Properties of Semi-Automatic TIG Arc Welding and Brazing Joints of Copper Tubes
摘要
Abstract
Silicon bronze welding wire SG-CuSi3 was used as the brazing material,and industrial borax was used as the flux for flame brazing and semi-automatic TIG arc melting and brazing experiments on ø34 mm and ø38 mm copper tube lap joints.Through macro observation,hydraulic pressure test,mechanical performance test,metallographic analysis,and frac-ture morphology analysis,the microstructure characteristics and mechanical properties of the welding joints under the two welding processes were compared and analyzed.The results show that the base material of the copper tube does not melt dur-ing flame brazing,and the flame brazing joint is mainly formed by the infiltration of the brazing material into the lap,with obvious fine porosity defects,a tensile strength of 204 MPa,and a welding coefficient of only 0.51;the internal and external copper tubes of the semi-automatic TIG arc melting and brazing joint melt,the weld microstructure is uniform,there are fewer defects,the tensile strength reaches 238 MPa,and the welding coefficient is increased to 0.60,significantly improving the mechanical properties.Semi-automatic TIG arc melting and brazing can effectively improve the mechanical and sealing properties of copper tube lap joints,with simple operation,high efficiency,good safety,and a promising application prospect in copper tube lap connections.关键词
半自动TIG熔钎焊/紫铜管搭接接头/力学性能/微观组织/火焰钎焊Key words
semi-automatic TIG melting and brazing/copper tube lap joints/mechanical properties/microstructure/flame brazing分类
矿业与冶金引用本文复制引用
王孟果,邵丹丹,李武凯,孙大翔,谢咏馨..紫铜管半自动TIG电弧熔钎焊接头组织与性能研究[J].电焊机,2024,54(12):62-67,6.基金项目
工信部高技术船舶科研项目(CJ05N20) （CJ05N20）
广东省舰船先进焊接技术重点实验室(2023B1212070026) （2023B1212070026）
