Effect of laser-TIG composite wire filling welding process on microstructure and hardness of 6061 aluminum alloy
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摘要: 采用激光-TIG复合热源填丝焊接5 mm厚T651态6061铝合金,研究电弧电流对复合填丝焊接焊缝成形的影响,分析了优化工艺参数下的焊缝显微组织及显微硬度特征,并与单独TIG填丝焊接进行综合对比。结果表明:采用激光-TIG复合热源填丝焊接T651态6061铝合金,能够有效改善焊缝成形,当TIG电弧电流为140 A时焊接过程稳定,焊缝成形效果良好;复合填丝焊接焊缝中心区域的显微组织为等轴晶,熔合区组织由大量枝状晶组成;复合填丝焊接显微硬度高于单独TIG填丝焊接,焊缝区均存在软化现象,在选择的测试点范围内,复合填丝焊接焊缝中心区域的平均硬度为66.91 HV,约为母材硬度的62.0%,比单独TIG填丝焊接提高约13.1%。
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关键词:
- 6061-T651铝合金 /
- 激光-TIG复合填丝焊接 /
- 焊缝成形 /
- 显微组织 /
- 显微硬度
Abstract: Welding 5 mm thick 6061-T651 aluminum alloy with laser-TIG composite heat source filler wire, investigate the influence of arc current on weld formation of composite filler wire welding , analyzed the weld microstructure and microhardness characteristics under the optimized process parameters,and compared with single TIG filament welding. The results show that the use of laser-TIG arc composite heat source filler wire welding of 6061-T651 aluminum alloy can effectively improve the weld formation; when the TIG arc current is 140 A, the welding process is stable and the welding seam forming effect is good; the microstucture in the center area of the composite filler wire weld is equiaxed, and the fusion zone is compo sed of a large number of dendrites; the microhardness of composite filler wire welding is higher t han that of single TIG filler wire welding, there is a softening phenomenon in the weld area,within the range of selected test points, the average hardness of the weld center of the composite filler wire welding is 66.91 HV, which is about 62.0% of the hardness of the base material, which is about 13.1% higher than the microhardness of the TIG filler wire welding alone. -
表 1 母材和ER4043焊丝化学成分
% 材料 Cu Si Mn Zn Fe Mg Cr Al Al6061 0.22 0.62 0.15 0.25 0.7 1.06 0.04~0.35 余量 ER4043 0.3 4.5~6 0.05 0.1 0.8 0.05 — 余量 表 2 电弧电流对焊缝成形的影响
电弧电流
I/A单独TIG填丝焊接2 mm 激光-TIG复合填丝焊接2 mm 焊缝形貌 焊缝横截面 焊缝形貌 焊缝横截面 120 130 140 150 -
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