真空激光焊接工艺参数对AZ31镁合金熔深的影响及缺陷分析  

Effect of Vacuum Laser Welding Parameter on AZ31 Magnesium Alloy Penetration and Flaw Analysing

作　　者：包海涛[1] 刘金合[1] 刘锟[1] 徐韦锋[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《应用激光》2008年第5期366-370,共5页Applied Laser

基　　金：国家自然科学基金资助项目(项目编号:50675179)

摘　　要：在真空条件下用低功率YAG激光对AZ31镁合金进行焊接,为了证实真空对等离子体的抑制作用,分别对不同真空度下能量输入和焊接速度对焊缝熔深以及熔宽的影响进行了系统的分析。结果表明随着真空度的提高焊缝熔深以及熔宽有显著的变小。与大气中相比,在真空中获得的焊缝表面成型良好,且有明显的金属光泽。另外发现焊接过程中产生的主要缺陷是咬边、气孔以及裂纹而真空中这样的缺陷相对较少。显微硬度测量表明,真空中的焊缝显微硬度明显高于大气中的焊缝。The characteristics o{f using low-power YAG laser weld the AZ31magnesium alloy under vacuum condition has been investigated. In order to comfirm vacuum condition can effectively restrain plasma ,the effect of welding speed and energy input to melted depth and melted width have been analysed individually. The result sho.w that as the vacuum degree increasing the melted depth and melted width decreasing obviously. The welding joint welded under vacuum condition can get a better surface. The main flaw are undercut, porosity and cracking;but there are less flaw under vacuum condition. Micorhardness test express that a harder welding joint can be gotten under vacuum condition.

关 键 词：低功率YAG激光 AZ31镁合金 真空 缺陷 显微硬度 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG457.19[金属学及工艺—金属材料]