焊接热影响区对钛合金小径管对接焊缝的影响

Research on Effect of HAZ to Butt Weld of Small Diameter Titanium Alloy Pipe

采用Φ8 mm钛合金管开展了带与不带热影响区焊接的四组管-管对接自动氩弧焊试验,获得了小管径钛合金管对接焊缝焊接热影响区的宽度范围,并通过对四组焊接接头的外观尺寸、微观组织、硬度及拉伸性能进行对比分析,得出焊接热影响区对小管径钛合金管对接焊缝组织性能无明显影响的结论。该试验研究结果对小管径钛合金管焊接的工程应用具有重要意义。

Four groups of welding experiments between new and weld with heat-affected zone（HAZ） were done by using titanium alloy pipes （Ф8 mm）. The width of the HAZ in small kinds of titanium alloy pipe butt weld was analyzed, the difference of performance on the dimension, microstructure, hardness and tensile strength was analyzed. The results show that the performance of weld seam with HAZ is equivalent as the new weld seam, which can satisfy all the technical index. The conclusion is valuable for other small diameter titanium alloy pipe butt weld.