通过感应熔炼方法制备Sn含量不同的Cu基钎料，在不同工艺条件下对紫铜进行钎焊。采用DTA、XRD、SEM和拉伸性能测试等手段研究不同Sn含量的Cu-P-Ag 钎料和钎焊工艺对紫铜焊接接头性能的影响，比较Sn含量对焊料的熔点和焊接性能的影响，考察在630、670和730℃不同温度条件下以及不同Sn含量的钎料对焊接接头力学性能的影响。结果表明：适量的 Sn 含量和合理的焊接工艺可以改善焊接接头的微观组织，从而增强焊接接头的力学性能，在Sn含量为6%时钎料的焊接性能最好，抗拉强度达到210.32 MPa，经670℃焊接后可得到结合较为良好的焊接接头。%Copper was brazed using Cu-based alloy filler with different Sn contents prepared by vacuum induction melting. Differential thermal analysis (DTA), X-Ray diffraction (XRD), scanning electron microscope (SEM) and mechanical testing were used to studied the effects of different Sn contents and welding procedures on mechanical properties and microstructure of welding joints. The welding performances of filler with different Sn contents were also studied. Besides, the impacts of brazing temperatures of 630, 670, 730℃on welding joints’ properties were discussed. The results indicate that an appropriate amount of Sn and a reasonable welding procedure can induce welding joints’ microstructural refinement, and therefore the enhancement of mechanical properties of welding joints. The highest tensile strength of 210.32 MPa can be obtained when the content of Sn is 6%and brazing temperature is 670℃.
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