【摘要】 采用拉锻式摩擦塞补焊方法对4mm厚的2014铝合金进行了焊接,焊后对接头的微观组织和力学性能及断裂特性进行了分析。研究结果表明,摩擦塞补焊接头由焊缝区、热影响区和母材这3部分组成,焊缝由细小的等轴再结晶组织构成。力学试验表明:摩擦压力、摩擦时间、塞棒/塞孔配合角度以及工进速度均会影响接头质量,选择合适的焊接参数和接头结构,塞补焊接头的抗拉强度可以达到375MPa,约为母材强度的79%。断口形貌分析显示,接头断裂模式为塑性断裂。更多还原

【Abstract】 Friction plug welding(FPW) of 2014 Al alloy in 4mm thickness is carried out and the microstructures,mechanical properties and fracture mode of the joint are analyzed.The result shows that the FPW joint microstructures could be divided into three different regions including welding seam zone,HAZ and base metal zone.The welding seam consists of refined and equiaxial recrstallized grains.Mechanical experiment shows that the technological parameters,such asfrictional pressure,friction time,tapered plug/tapered hole suited angles and welding speed can affect joint properties.The peak tensile strength of the FPW joint can reach 375 MPa as much as 79% of the base metal by selection of suitable welding parameters and joint structures.The analysis of the fracture surface morphology shows that it is ductile fracture.更多还原