Cu作中间层的汽车用铝合金/钢焊接研究

Study on Al Alloy/Stainless Steel Diffusion Welding Using Cu as Interlayer

采用Cu中间层对铝合金和不锈钢进行真空扩散焊接。采用万能试验机和显微硬度计测试焊接接头力学性能,采用SEM、EDS对焊接接头的显微结构和元素分布进行了分析。结果表明,铝合金/Cu/不锈钢焊接接头剪切强度随保温时间的增加先增加后减小,保温时间为60 min时剪切强度达到最大值60.2 MPa。其焊缝由靠近铝侧反应层和靠近钢侧反应层组成,焊缝处显微硬度高于两侧基体。

Cu interlayer was used to diffusion welding A1 alloy and stainless steel. The universal testing machine and microhardness test were used to obtain the mechanical property of the welded joints. The microstructure and element distribution of the welded joints were studied by SEM and EDS. The results show that the shear strength increases firstly and then decreases by holding time increasing, and it can exhibit a maximum value of 60.2 MPa at the holding time of 60 min. The weld seam of A1/Cu/steel joint was formed by near the side of aluminum and steel products. The microhardness on both of the conversion zone is higher than that of the matrix.