ZL114A铝合金激光-电弧复合焊接头枝晶尺寸与熔宽的关系

摘要

采用激光-电弧复合焊方法对厚度为8mm的ZL114A铝合金板进行焊接实验,焊后对接头显微组织尺寸与分布进行了分析.结果表明,在不同工艺参数得到的各焊接接头中,树枝晶尺寸与熔凝区宽度具有一定的相关性,熔凝区宽度一定枝晶尺寸一定,且树枝晶尺寸沿板厚方向从焊缝上部到根部逐渐变小,呈近似线性变化.%ZL114A casting alloy plate with 8mm thickness was welded by Laser-MIG hybrid welding, the size and distribution of welding joints microstructure were investigated. The results show that the dendritic length has certain correlation with the width of fusion zone in different welding joints, which obtained by different process parameters. The dentritic length can be determined when the width of fusion zone is fixed. What's more, the dendritic length shows a nearly linear decrease from top to root along the thickness direction of the welding joints.