触头电阻钎焊工艺和微观组织研究

朱世良; 田修波; 陈庆; 张天怡; 郝子硕

doi:10.7512/j.issn.1001-2303.2024.12.19

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触头电阻钎焊工艺和微观组织研究
Study on the Resistance Brazing Process and Microstructure of Electrical Contacts
2024年54卷第12期页码：121-125
纸质出版日期： 2024-12-25 ，
DOI： 10.7512/j.issn.1001-2303.2024.12.19
稿件说明：

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朱世良，田修波，陈庆，等.触头电阻钎焊工艺和微观组织研究［J］.电焊机，2024，54（12）：121-125.

ZHU Shiliang, TIAN Xiubo, CHEN Qing, et al.Study on the Resistance Brazing Process and Microstructure of Electrical Contacts[J].Electric Welding Machine, 2024, 54(12): 121-125.
朱世良，田修波，陈庆，等.触头电阻钎焊工艺和微观组织研究［J］.电焊机，2024，54（12）：121-125. DOI： 10.7512/j.issn.1001-2303.2024.12.19.

ZHU Shiliang, TIAN Xiubo, CHEN Qing, et al.Study on the Resistance Brazing Process and Microstructure of Electrical Contacts[J].Electric Welding Machine, 2024, 54(12): 121-125. DOI： 10.7512/j.issn.1001-2303.2024.12.19.

摘要

采用电阻钎焊方法对AgSnO

触点和H62黄铜触桥进行焊接，钎料选用BAg60CuZn，分析了焊接电流、焊接时间和焊接压力对触头剪切强度的影响规律。结果表明，当焊接电流为7.5 kA，焊接时间为90周波，电极压力为2.3 kN时，触头剪切强度达到最大值20.3 MPa。随着钎着率的增加，触头的剪切强度不断增大，并在钎着率约为85%时趋于稳定，约为20 MPa。微观组织分析表明，焊缝主要由银铜共晶体和固溶体组织组成，且随着钎着率的提高，焊缝组织逐渐完善，缺陷减少。采用超声C扫描计算所得的钎着率可以直接反映触头的焊接质量。

Abstract

The resistance brazing method was employed to weld AgSnO

contact points and H62 brass contact bridges using BAg60CuZn brazing filler metal. The effects of welding current

welding time

and welding pressure on the shear strength of the contacts were analyzed. The results indicate that the maximum shear strength of 20.3 MPa is achieved when the welding current is 7.5 kA

the welding time is 90 cycles

and the electrode pressure is 2.3 kN. As the brazi

ng rate increases

the shear strength of the contacts continuously increases and stabilizes at approximately 20 MPa when the brazing rate reaches about 85%. Microstructural analysis reveals that the weld consists mainly of silver-copper eutectic and solid solution structures. With the increase of the brazing rate

the weld microstructure gradually improves

and defects decrease. The brazing rate calculated by ultrasonic C-scan can directly reflect the welding quality of the contact

关键词

电阻钎焊触头钎着率剪切强度

Keywords

resistance brazing weldingelectrical contactbrazing rateshear strength

references

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祁少飞. 共晶体组织对Ag-CdO触头感应钎焊剪切强度的影响［J］. 太原重型机械学院学报，2003，24（2）：117-119.

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