TYPE DH₂-1 CHROMIUM-ZIRCONIUM-COPPER ALLOY FOR RESISTANCE WELDING ELECTRODE TIPS

This paper chiefly deals with the manufacturing technique and the application of a new type welding electrode tip made of DH₂-1 Chromium-Zirconium-Copper Alloy.With the purpose of obtaining the longest possible service life,the optimum composition range of the alloy and the technical specifications for each step of alloy production process are studied.The results of study are as follows:optimum composition range of DH₂-1 Alloy,Cr0.25~0.40% Zr0.08~0.15%;solution heat treatment,950~970℃ for 1.5~2 hrs;cold deformation rate,40~50%;aging trcatment,450~500℃ for 2~3 hrs.For electrode tips made according to the above technology,the following superior properties can be assured:conductivity≥75% IACS,Rockwell Hardness HRB≥80,softening temperatur4≥600℃.Through a lot of practice and application in both ferrous and nonferrous alloy welding,the quality of welds proved excellent.As compared with the Chromium-Aluminum-Magnesium alloy(МЦ-4),Zircomium-Copper alloy(Zr-Cu) and Silver-Chromium-Copper alloy(AC₂),which have been widely used in our country,the service life of DH₂-1 Alloy electrode tips is increased generally by 3~10 times,in addition to the greatly improved welding quality and productivity.