摘要
通过常规及细晶粒Ti-6Al-4V钛合金的GTAW试验,对比了不同焊接工艺时两种钛合金的焊缝成形.结果表明,由于细晶钛合金晶粒细化,晶界增多,而使热导率降低,焊接过程中晶界对热量传导的阻碍作用变大,这就使得细晶粒钛合金的焊接参数范围变窄,在很大的电流参数范围内,细晶粒钛合金的焊缝成形性能均比常规钛合金差很多;但是在一个较窄的电流变化围内,细晶钛合金的焊缝成形性能优于常规钛合金,超出此范围,成形较差;并讨论了可能的影响因素;针对文中的试件规格推荐了一个最优的焊接电流参数为47～48A.
Fine grain titanium alloy is used extensively in aerospace and ailrraft because of its excellent comprehenslve properties and outstanding machinability. Fine grain Ti-6Al-4V alloy and common grain Ti-6Al-4V alloy were welded by tungsten iner-gas arc welding(GTAW)respectively. Welding parameters and appearance of two Ti-6Al-4V alloys welded were investigated. The results indicate that the heat conductivity impediment of grain boundary strengthened because of fine grain Ti-6Al-4V alloy grains refinement and grain boundary increasing. Thus,its coefficient of heat conductivity is decreasing. Camparing with appearance of common grain Ti-6Al-4V alloy,when the range of welding current parameter was wide,the appearance of fine grain Ti-6Al-4V alloy was bad. However,when the range of welding current parameters was narrow relatively,the appearance of fine grain Ti-6Al-4V alloy welded was better than the one of common grain Ti-6Al-4V alloy. The possible influencing factors were discussed. At last,according to the specimen size,an optimal welding current parameter(47～48)A was recommended.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2009年第7期25-28,共4页
Transactions of The China Welding Institution
基金
国家重大基础研究项目(2006094-8)
关键词
细晶粒钛合金
焊缝成形
热导率
晶界
fine grain Ti-6Al-4V alloy
appearance of weld
heat conductivity
grain boundary
