异种金属的有效连接在高新技术领域具有实际意义,采用电阻点焊方法焊接稀有金属钨片和镍丝.用SEM,HRTEM表征焊接接头的组织形貌,用拉伸试验机测定焊接件的抗剪切力.采用如下焊接工艺:第一阶段:预压力是100 N,使钨镍良好接触;第二阶段:保持预压力不变,施以预热电流1.1KA,400 ms,然后再施以焊接电流1.7KA,400 ms;第三阶段:保持100 N的电极压力60 ms;最后,撤去电极压力.HRTEM结果表明:钨镍之间通过高温原子扩散形成置换固溶体而形成有效的连接,且在钨镍界面上没有新相形成.SEM结果表明焊接接头的镍丝没有翘头,且边缘没有严重压扁现象.经上述工艺得到的焊接接头的抗剪切力约为40 N,符合焊接件技术要求.
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