Research on the Microstructure and Properties of Semi-Automatic TIG Arc Welding and Brazing Joints of Copper Tubes

WANG Mengguo; SHAO Dandan; LI Wukai; SUN Daxiang; XIE Yongxin

doi:10.7512/j.issn.1001-2303.2024.12.10

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Research on the Microstructure and Properties of Semi-Automatic TIG Arc Welding and Brazing Joints of Copper Tubes
Vol. 54, Issue 12, Pages: 62-67(2024)
Published： 25 December 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.12.10
稿件说明：

移动端阅览

王孟果，邵丹丹，李武凯，等.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.

WANG Mengguo, SHAO Dandan, LI Wukai, et al.Research on the Microstructure and Properties of Semi-Automatic TIG Arc Welding and Brazing Joints of Copper Tubes[J].Electric Welding Machine, 2024, 54(12): 62-67.
王孟果，邵丹丹，李武凯，等.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. DOI： 10.7512/j.issn.1001-2303.2024.12.10.

WANG Mengguo, SHAO Dandan, LI Wukai, et al.Research on the Microstructure and Properties of Semi-Automatic TIG Arc Welding and Brazing Joints of Copper Tubes[J].Electric Welding Machine, 2024, 54(12): 62-67. DOI： 10.7512/j.issn.1001-2303.2024.12.10.

摘要

采用硅青铜焊丝SG-CuSi3作为钎料，工业

硼砂作为钎剂，对

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34 mm和

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38 mm的紫铜管搭接接头进行火焰钎焊和半自动TIG电弧熔钎焊试验。通过宏观观察、水压试验、力学性能测试、金相分析和断口形貌分析等方法，对比分析两种焊接工艺下焊接接头的组织特征和力学性能。结果表明，火焰钎焊时紫铜管母材未发生熔合，火焰钎焊接头主要依靠钎料浸润搭接而形成，存在明显的细小孔洞缺陷，抗拉强度为204 MPa，焊接系数仅为0.51；半自动TIG电弧熔钎焊接头内外铜管发生熔合，焊缝组织均匀，缺陷较少，抗拉强度达到238 MPa，焊接系数提高到0.60，力学性能显著提升。半自动TIG电弧熔钎焊可以有效提升紫铜管搭接接头的力学性能和密封性能，其操作简单、效率高、安全性好，在紫铜管搭接连接中具有良好的应用前景。

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

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34 mm and

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38 mm copper tube lap joints. Through macro observation

hydraulic pressure test

mechanical performance test

metallographic analysis

and fracture 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 during 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

Keywords

semi-automatic TIG melting and brazingcopper tube lap jointsmechanical propertiesmicrostructureflame brazing

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