【摘要】 采用搅拌摩擦焊接方法对厚度为30mm和50mm的T2紫铜板分别进行单面和双面焊接实验,并对焊缝的微观组织与力学性能进行了分析.结果表明:在一定的参数范围内,可获得表面成形美观、内部无缺陷且变形小的对接接头.30mmT2紫铜板单道焊焊后平均抗拉强度为177.2MPa,达到母材的81.7%,断后平均伸长率为25.4%;焊缝横切面显微硬度分布波动较大,最低值位于前进侧热影响区底部,说明了此处位置是焊缝薄弱环节.更多还原

【Abstract】 Single-side and double-sided welding tests of T2 copper with thicknesses of 30 mm and 50 mm were done by friction stir welding,while the microstructure and mechanical properties of welds were analyzed. The results show that butt joints with good superficial shaping quality,almost no deformation,and no internal defects can be achieved within certain ranges of process parameters. The average tensile strength of the T2 copper single-side weld with a thickness of 30 mm is 177.2 MPa,reaching 81.7% of the strength of the base metal,while the average elongation after fracture is 25.4%. The microhardness distribution of the weld transverse section fluctuates obviously,with the minimum locating at the bottom of the heat affecting zone along the advancing side,where it is welding weakness.更多还原