【摘要】 针对6～8mm厚2219–T87铝合金拉锻式摩擦塞焊工艺进行了研究。结果表明,塞棒/塞孔及砧板成形孔结构及轴向载荷、焊接转速、进给速度等焊接工艺参数均对焊接质量有重要影响。采用圆弧形塞棒、圆柱形塞孔、阶梯锥形底孔的砧板能够改善塞孔附近材料的流动方向和受力条件,进而消除未焊合缺陷。焊接转速7000r/min、焊接压力20～30kN、轴向拉锻力20～30kN、进给速度1.5mm/s是较优的焊接工艺范围。焊接接头中母材侧的热力影响区软化最为明显,硬度值为79.9HV。在优化参数下,焊接接头的抗拉强度可达365MPa,延伸率6%。更多还原

【Abstract】 In the study, friction pull plug welding(FPPW) process of 6–8 mm thick 2219–T87 aluminum alloy was discussed. The results show that the structure of the plug and hole, the forming hole and the main welding parameters(axial load, welding speed and feed speed) have important influence on the weld formation. The use of circular arc-shaped plug rod, cylindrical plug hole and stepped tapered bottom hole can improve the flow direction and stress conditions of the base material and eliminate the unwelded defects. The welding speed is 7000 r/min, the welding pressure is 20 kN, the axial forging force is 20–30 kN, and the feeding speed is 1.5 mm/s. In the welded joint, the softening in the thermal mechanically affect zone on the base material side is the most obvious, and the hardness value is 79.9 HV. Under the optimized parameters, the tensile strength of the welded joint can reach 365 MPa, and the elongation is 6%, which is equivalent to 80% of the base metal.更多还原