压缩/直径比对纯铜对接冷压焊焊接接头的影响

冷压焊由于其不存在熔化区、焊接热影响区,在功能材料连接时具有突出优势.以压缩/直径比为单一变量对纯铜棒进行对接冷压焊工艺试验,并结合接头变形过程应变数值模拟计算与组织分析探讨获得较好的焊接接头强度的条件.结果表明:随着纯铜棒压缩/直径比增大,焊接接头各个区域的有效塑性应变值增加,连接界面处最大有效塑性应变量由2.6增加至2.9.随着应变量的增加,再结晶晶粒所占的比例增加,接头抗拉强度呈现阶梯型增大规律.

Effect of compression/diameter ratio on pure copper butt cold-welded welded joints

Cold pressing welding has outstanding advantages in the connection of functional materials because it does not have melting zone and welding heat affected zone. In this investigation, the butt cold pressing welding for pure copper rod was tested with compression/diameter ratio of the rod as a single variable, and conditions for obtaining better strength of welded joint were discussed in combination with numerical calculations of rod strain and microstructure analysis of joint deformation process. The results show that with the increase of the compression/diameter ratio of the pure copper rod, the effective plastic strain of each region of the welded joint increases, and therefore the maximum effective plastic strain at the joint interface goes up from 2.6 to 2.9. With the increase of strain, the proportion of recrystallized grains increases, and the tensile strength of the joint exhibits a stepwise increasing.