基于随焊气体动态冷却方法的钛合金薄板激光焊接变形试验研究  

Experimental Study on Laser Welding Deformation of Titanium Alloy Sheet Based on Synchronous Gas Cooling during Welding

作　　者：刘西霞[1] 尹存宏[1,2] 刘维岗[1] 

机构地区：[1]贵州大学机械工程学院,贵州贵阳550025 [2]贵州交通职业技术学院,贵州贵阳550001

出　　处：《热加工工艺》2017年第13期57-60,共4页Hot Working Technology

基　　金：面向智能装备领域的"技术众筹"研究生创新基地项目(贵大研CXJD[2015]003)

摘　　要：为了减小激光焊接钛合金薄板产生的变形,在焊接过程中使用液氮冷却后的氩气对激光热源的后部进行同步跟随激冷。对1.5 mm厚TC4钛合金薄板激光焊接的变形控制效果进行了试验验证。结果表明,相同工艺参数条件下,该方法获得的焊接试件挠曲变形明显小于常规激光焊接的变形;当冷热源间距为10 mm,冷却气体流量为10L/min,激光功率为950 W,焊速为15 mm/s,离焦量为0 mm时,焊后变形最小,最大纵向挠曲变形量仅为0.187 mm。In order to decrease the laser welding deformation of titanium alloy sheet, the argon cooled by liquid nitrogen was used to synchronously chill the region of test piece at back of the laser heat source during laser welding process. The effects of the deformation control for 1.5 mm thick TC4 titanium alloy sheet was verified by experiments. The results show that under the same process parameters, the deformation of specimen obtained by the method is smaller than that of specimen obtained by conventional laser welding. When the cold-heat source spacing is 10 mm, the cooling gas flow is 10 L/min, the laser power is 950 W, the welding speed is 15 mm/s, the defocusing distance is 0 mm, the deformation after welding is minimum, and the maximum longitudinal deflection is only 0.187 mm.

关 键 词：激光焊接 气体动态冷却 焊接变形 TC4钛合金 

分 类 号：TG456.7[金属学及工艺—焊接] TG404