两种高能束焊TC4合金接头的低周疲劳性能比较

Comparison of low-cycle fatigue properties of two kinds of high energy beam welded joints of TC4 alloy

比较30mm厚Ti6Al4V钛合金真空电子束焊接和激光摆动填丝焊接头的低周疲劳性能。测试结果表明,电子束焊接头的低周疲劳性能接近母材,而激光填丝焊接头的低周疲劳性能明显不如电子束焊接头和母材。通过研究两个接头的母材、热影响区和焊缝区的显微硬度,发现电子束焊接头的焊缝区显微硬度与母材的接近,但均低于热影响区的显微硬度,而激光填丝焊接头的焊缝区明显弱化。

The low-cycle fatigue properties of 30 mm Ti6Al4V titanium alloy joints welded by vacuum electron beam welding and laser wobble welding with filler wire were compared.The test results show that the low-cycle fatigue performance of the electron beam welding joint is close to that of the base meal,while the low-cycle fatigue performance of the laser wobble welding with a filler wire joint is clearly inferior to that of the electron beam welding joint and base meal.An examination of the microhardness of the base metal,heat-affected zones and weld area of the two joints found that the microhardness of the weld area of the electron beam welding joint is close to that of the base meal,but is lower than that of the heat-affected zones on both sides.The weld area of the laser wobble welding with the filler wire joint is significantly weakened.