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周水亮, 陶军, 郭德伦. 细晶粒钛合金GTAW焊缝成形性能分析[J]. 焊接学报, 2009, (7): 25-28.
引用本文: 周水亮, 陶军, 郭德伦. 细晶粒钛合金GTAW焊缝成形性能分析[J]. 焊接学报, 2009, (7): 25-28.
ZHOU Shuiliang, TAO Jun, GUO Delun. Appearance of fine grain titanium alloy by tungsten iner-gas arc welding(GATW)[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (7): 25-28.
Citation: ZHOU Shuiliang, TAO Jun, GUO Delun. Appearance of fine grain titanium alloy by tungsten iner-gas arc welding(GATW)[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (7): 25-28.

细晶粒钛合金GTAW焊缝成形性能分析

Appearance of fine grain titanium alloy by tungsten iner-gas arc welding(GATW)

  • 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.

     

    Abstract: 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.

     

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