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首页> 外文期刊>Science and Technology of Welding and Joining >Gas tungsten arc welding studies on similar and dissimilar combinations of Al - Zn -Mg alloy RDE 40 and Al - Li alloy 1441
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Gas tungsten arc welding studies on similar and dissimilar combinations of Al - Zn -Mg alloy RDE 40 and Al - Li alloy 1441

机译：Al-Zn-Mg合金RDE 40和Al-Li合金1441的相似和不同组合的钨极弧焊研究。

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摘要

The present study is concerned with gas tungsten arc welding of two high strength aluminium alloys, namely, an Al-Zn-Mg alloy (RDE 40) and an Al-Li based alloy of Russian grade 1441. One of the critical requirements of these two alloys is that they should he weldable. In the present work, weldability aspects of these alloys were studied in terms of solidification cracking tendency, microstructure, tensile properties, and microhardness across the welds. These studies were extended to dissimilar welds between RDE 40 and 1441 produced via conventional gas tungsten arc (GTA) welding as well as pulsed current GTA welding. It was found that RDE 40 welds were less sensitive to solidification cracking and weld metal porosity compared with 1441 alloy. The superior weldability of RDE 40 was related to the equiaxed nature of the fusion one and a lower sensitivity to moisture pickup. It was possible to produce RDE 40-1441 welds without defects. Pulsed current welding of RDE 40 to 1441 showed improved mechanical properties compared with conventional GTA welding, and these were related to the refinement of the fusion zone microstructure.
机译：本研究涉及两种高强度铝合金的气体钨极电弧焊，即Al-Zn-Mg合金（RDE 40）和俄罗斯等级1441的Al-Li基合金。这两项的关键要求之一合金是他们应该可焊的。在当前的工作中，从凝固裂纹趋势，显微组织，拉伸性能和整个焊缝的显微硬度方面研究了这些合金的可焊性。这些研究扩展到了通过传统的钨极氩弧焊（GTA）焊接和脉冲电流GTA焊接生产的RDE 40和1441之间的异种焊缝。研究发现，与1441合金相比，RDE 40焊缝对凝固裂纹和焊缝金属孔隙率的敏感性较低。 RDE 40的优越焊接性与熔合剂的等轴性和对水分吸收的较低敏感性有关。可以生产无缺陷的RDE 40-1441焊缝。与传统的GTA焊接相比，RDE 40至1441的脉冲电流焊接显示出改善的机械性能，并且与熔合区显微组织的细化有关。

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