6005A铝合金激光-TIG复合热源填丝焊接技术

发布时间：2018-02-03 12:25

本文关键词： A铝合金激光-TIG复合焊接微观组织力学性能　出处：《焊接学报》2017年10期 　论文类型：期刊论文

【摘要】：采用激光-TIG复合热源填丝焊接新方法焊接高速列车用6005A铝合金,对复合焊接工艺、接头微观组织、力学性能、断口形貌及焊接热裂纹进行了研究.结果表明,激光功率为2 000~3 000 W、TIG电流为150~195 A、焊接速度为0.4~0.8 m/min时焊接过程比较稳定,熔合比合适,可以获得优良的焊缝成形.焊缝区由焊缝边缘的柱状晶和焊缝中心的等轴晶组成.熔合比γ控制在0.54~0.7范围内时,接头的平均抗拉强度约为193.39 MPa;接头抗拉强度随熔合比的增大而增大,并且γ=0.7时,抗拉强度最大,约为205 MPa,占母材强度的70%.
[Abstract]:A new method for welding 6005A aluminum alloy used in high-speed train using laser TIG composite heat source filling wire welding method was adopted. The composite welding process, microstructure, mechanical properties, fracture morphology and welding hot crack were studied. The welding process is stable and the fusion ratio is suitable when the laser power is 2 000 t / t 3 000 W / g TIG current is 150 ~ 195 A and the welding speed is 0. 4 ~ 0. 8 m / min. Excellent weld formation can be obtained. The weld zone is composed of columnar crystals at the edge of the weld and equiaxed crystals in the center of the weld. When the fusion ratio 纬 is controlled in the range of 0.540.70, The average tensile strength of the joint is about 193.39 MPA, and the tensile strength of the joint increases with the increase of the fusion ratio, and the maximum tensile strength is about 205 MPA at 纬 -0. 7, which accounts for 70% of the strength of the base metal.
【作者单位】：北京科技大学材料科学与工程学院;上海航天设备制造总厂;中车青岛四方机车车辆股份有限公司;
【基金】：国家自然科学基金资助项目(51475040) 中央高校基本科研业务费专项资金资助项目(FRF-TP-15-004A3)
【分类号】：TG456.7
【正文快照】： 0序言车体轻量化是提速、减时、节能减耗的重要手段[1].铝合金因为具有比重轻、无低温脆性转变、耐腐蚀等优点,在高速轨道列车车体制造中得到广泛应用.6005A铝合金为Al-Mg-Si系可热处理强化铝合金,具有中等强度、较好的挤压成形性等优点,是当前国内制造高速铝合金列车车体使用

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