摘要
采用CO2激光焊接试验系统,对AZ31镁合金的激光填丝焊工艺进行了研究。试验中采用AZ31焊丝作为填充金属,对各种焊接工艺参数的影响进行了较系统地研究,并获得了较好的工艺参数选择范围。焊后对典型的焊接接头的性能进行了研究。结果表明,在适当的填丝速率下,填丝焊工艺形成的焊缝成形更加美观,克服了不填丝焊接情况下焊缝的严重下塌问题。微观组织分析表明,焊接接头区域主要由细小的枝状晶组成,晶粒明显细化。焊接接头的显微硬度和抗拉强度都接近母材,说明获得的焊缝具有较好的力学性能。表明了CO2激光填丝焊工艺是实现AZ31镁合金焊接的有效方法。
CO2 laser welding process of AZ31 magnesium alloys with filler wire was investigated using a special CO2 laser welding experimental system.The effect of welding parameters was systematically researched using AZ31 wire as filler materials and a suitable parameters range was obtained.The properties of two typical welds were studied after welding experiment.The results show that,when the filler metal of AZ31 was used,the weld appearance is good and the disadvantage of obvious concave top surface for normal laser welding(no filler materials) can be overcome.The analysis results indicate that the microstructure of weld zone is consisted of small dendritic grains.The microhardness and tensile strength of two typical joints are almost the same as those of the base metal,which implies that the welds formed with filler wire have good mechanical properties.Laser welding with filler wire provides a good method to realize the welding of AZ31 magnesium alloys.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第6期93-96,共4页
Transactions of The China Welding Institution
关键词
镁合金
激光焊接
填丝焊
接头性能
AZ31 magnesium alloys
laser welding
welding with filler wire
joint properties
