【摘要】 采用低功率激光诱导电弧复合热源对TC4钛合金进行T形结构件穿透焊接工艺试验。分析激光与电弧复合热源间距(D_la)、冷填丝条件、热输入对T形件焊缝成形的影响规律,测试分析T形结构穿透焊接接头横截面形貌、微观组织、力学性能及断口形貌。结果表明,激光-电弧复合焊接方法可以实现钛合金T形结构正面及背面焊缝成形的精确控制。当D_la=2时使激光与电弧获得最佳的耦合效果,增强了复合热源的穿透能力,改善了焊缝背面成形;冷填丝的加入能够有效改善焊缝正面的咬边及烧穿问题;激光与电弧热输入的协调是实现焊缝正面熔宽控制的主要因素之一。更多还原

【Abstract】 Low-power laser-induced arc hybrid welding technology is used in TC4 titanium alloy T-shaped structure welding process.The influence of the distance between the laser and arc tungsten,cold filler wire conditions,welding heat input on the weld appearance are analyzed in the experiments.Structure shape and microstructure of the cross sections,mechanical property and fractures of T-shaped joint are examined.The results show that the front and back appearance of titanium alloy T-shaped structure can be controlled precise by the laser-TIG hybrid welding technology.As the Dla=2,the best coupling effect of laser and TIG is obtained,which increases the penetration and improves the appearance of the back side.The addition of the cold filler wire can improve the front side undercut and burn through defects.The coordination of laser and arc heat input is one of the major factors on the controlling of the front side weld width.更多还原