P元素对SCu1898紫铜焊丝焊接抗裂性的影响

为避免SCu1898紫铜焊丝在焊接中出现接头裂纹，通过自主熔炼制作SCu1898紫铜焊丝，采用化学分析、着色渗透试验、金相试验和拉伸试验研究分析了不同P含量对紫铜焊接接头抗裂性、组织和力学性能的影响。试验结果显示，加P的紫铜焊丝铸锭及其焊缝熔敷金属中均会产生Cu3P脆性相，P元素的增加可增大SCu1898紫铜焊丝的裂纹倾向，随着P含量逐步增加到0.15%，焊接接头力学性能明显降低。因此，应将紫铜焊丝中P元素的质量分数控制在0.07%以下，以减少焊接过程中热裂纹倾向。

The Effect of Phosphorus on Welding Cracking Resistance of SCu1898 Red Copper Wire

In order to avoid welded joint crack appeared in SCu1898 red copper wire welding,the influences of different content of phosphorus on welded joint cracking resistance,structure and mechanical property were analyzed by chemical analysis,dye penetration test,metallographic test and tensile test with Independent smelting production of SCu1898 red copper wire. The test results showed that Cu3P brittle phase appeared in P-containing red copper wire ingot and deposited metal,P content increasing raised cracking tendency of SCu1898 red copper wire,and mechanical properties were declined significantly with P content increasing to 0.15%. Therefore,P mass fraction should be kept below 0.07% to reduce the tendency hot crack in welding process.