AZ31镁合金激光焊接头中的缺陷分析

以变形镁合金AZ31为研究对象,研究CO2激光焊接镁合金的工艺特点,分析焊后接头中出现的常见缺陷,并探讨其产生的主要原因和有效的防止措施。结果表明:气孔、裂纹是AZ31镁合金CO2激光焊接头中存在的主要缺陷。另外,在有些情况下还容易产生夹杂、未熔合和未焊透、咬边、下塌等缺陷。但只要焊接过程中工艺参数选择合适,并采用有效的焊前、焊后处理措施,这些缺陷是可以避免或减少的。

Defects Analysis of AZ31 Magnesium Alloy Joints by Laser Beam Welding

Taking wrought magnesium alloy AZ31 as investigation objects,the process characteristics of CO2 laser beam welding was studied.The common defects in the welded joints were analyzed,and the main causes and significant preventive measures were discussed.The experimental results show that porosity and cracking are the main defects in AZ31 magnesium alloy joints.Sometimes there are other defects in the joints such as solid inclusion,incomplete fusion and penetration,undercut.However these defects can be avoided or minimized under the condition of appropriate process parameter and suitable treatment methods before and after welding.