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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting; 20050213-17; San Francisco, CA(US) >ROOT FLAWS OF FRICTION STIR WELDS - AN ELECTRON MICROSCOPY STUDY
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ROOT FLAWS OF FRICTION STIR WELDS - AN ELECTRON MICROSCOPY STUDY

机译：搅拌摩擦焊的根根-电子显微镜研究

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摘要

Friction stir welding is a reliable process and only sporadically welding flaws do occur. In this study root flaws were examined, which cause only partial bonding of the welded material in contrast to another welding flaw designated as "lack of penetration" which is essentially an unbonded part of the weld. The origin of root flaws is not fully understood yet, but supposedly they are related to oxide scales, always present on aluminium surfaces. In the present work 3 welds of the material AA 6013 were investigated. Root flaws were created intentionally by varying preoxidation treatments. Before friction stir welding the surface oxide layers on the aluminium plates were examined by transmission electron microscopy for comparison with the oxide remnants found within the weld zone. The root flaws in the friction stir welds were detected by non destructive ultrasonic inspection. Subsequently, root flaws were examined by optical-, scanning electron- and transmission electron microscopy. The characteristic structure of the root flaws actually suggests that this kind of welding flaw is caused by the pre-existing surface oxide phases.
机译：搅拌摩擦焊接是可靠的过程，只有偶尔出现焊接缺陷。在这项研究中，检查了根部缺陷，该缺陷仅导致焊接材料的部分粘结，与另一种称为“熔深不足”的焊接缺陷相反，后者基本上是焊缝的未粘结部分。根部瑕疵的起源尚不完全清楚，但据推测它们与铝表面上经常存在的氧化皮有关。在本工作中，研究了3种材料为AA 6013的焊缝。通过改变预氧化处理故意造成根部缺陷。在摩擦搅拌焊接之前，通过透射电子显微镜检查铝板上的表面氧化物层，以与在焊接区域内发现的氧化物残余物进行比较。搅拌摩擦焊缝中的根部缺陷通过无损超声检查得以检测。随后，通过光学，扫描电子和透射电子显微镜检查根部缺陷。根部缺陷的特征结构实际上表明这种焊接缺陷是由预先存在的表面氧化物相引起的。

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