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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural Investigation of VPPA–GMAW Welded 7A52 Aluminum Alloys
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Microstructural Investigation of VPPA–GMAW Welded 7A52 Aluminum Alloys

机译：VPPA-GMAW焊接7A52铝合金的微观结构研究

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摘要

In this study, the microstructural features of 7A52 heat-treatable aluminum alloys welded by variable polarity plasma arc (VPPA) combined with gas metal arc welding (GMAW) (VPPA–GMAW) were investigated and compared with those of 7A52 aluminum alloys welded by GMAW. The grain structures and modification of the precipitates were analyzed by optical microscopy and transmission electron microscopy. Complementary to modification of the precipitates, the precipitation evolution in the heat-affected zone and magnesium loss in the fusion zone were measured by differential scanning calorimetry and inductively coupled plasma spectroscopy. In VPPA–GMAW, the weld only needs one pass by depositing on one side of the 10-mm-thick aluminum alloy plates because of the large penetration capability of VPPA and good fluidity of the molten metal in the weld pool. Accordingly, the effect of excessive heat input on the microstructure can be minimized. The results show that the grain growth is not obvious and the magnesium loss is small in the fusion zone of VPPA–GMAW compared with that of GMAW under the condition of equal heat input to the workpiece. Small precipitates inside the grains remain homogeneously distributed, and a large volume fraction of the η ′ phase exists. The VPPA–GMAW weld exhibits less tendency to soften; thus, VPPA–GMAW is appropriate for welding thick-plate aluminum alloys with a high production rate.
机译：在该研究中，通过可变极性等离子体弧（VPPA）焊接的7A52可热处理铝合金的微观结构特征与气金属弧焊（GMAW）（VPPA-GMAW）进行了研究，并与由GMAW焊接的7A52铝合金相比。通过光学显微镜和透射电子显微镜分析晶粒结构和沉淀物的修饰。通过差示扫描量热法测量沉淀物的改性，沉淀物的改性，热影响区域中的沉淀进化和融合区中的镁损失测量。在VPPA-GMAW中，由于VPPA的渗透能力和焊接池中的熔融金属的良好流动性，因此只需在10毫米厚的铝合金板的一侧上沉积一侧即可需要一次通过。因此，可以最小化通过微观结构对微结构的过度热输入的影响。结果表明，谷物生长并不明显，镁损失在VPPA-GMAW的融合区中较小，与GMAW的融合区相比于工件的相同热量的条件下。在晶粒内部的小沉淀物保持均匀分布，并且存在η的大体积分数。 VPPA-GMAW焊缝的软化倾向较少;因此，VPPA-GMAW适用于具有高生产率的厚板铝合金。

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