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The dissymmetry of friction stir welding joints and variable polarity plasma arc welding joints study

机译：搅拌摩擦焊接头与变极性等离子弧焊接头不对称性的研究。

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In this paper, two welding methods which are FSW and VPPAW are used to weld 2219 aluminum alloy. Finally both the FSW and VPPAW will appear non-symmetrical welded joints, such non-symmetry is reflected in the microstructure morphology and performance. 1. In the FSW joints, defects in onion rings, the different of forward side and backward side microstructure and "Half-leaf "zone have made FSW joints have a strong dissymmetry. The dissymmetry in welded joints is brought about the dissymmetry in joint performance. The dissymmetry in FSW joint can not be suppressed due to the nature of the mixing head and the process of FSW, it is difficult to over come. 2. The problems about dissymmetry are also present in the VPPAW joint. However by changing the form of VPPAW, VPPAW joint can be adjusted to symmetry and results of satisfactory welding. Not only symmetrical microstructure is obtained, but also good properties of welded joints are obtained by using the right filling material.
机译：本文采用FSW和VPPAW这两种焊接方法来焊接2219铝合金。最后，FSW和VPPAW都将出现不对称的焊接接头，这种不对称性反映在显微组织的形态和性能上。 1.在FSW接头中，由于洋葱圈的缺陷，前后微结构的不同以及“半叶”区，使得FSW接头具有很强的不对称性。焊接接头的不对称导致接头性能的不对称。由于混合头的性质和FSW的过程，不能抑制FSW接头中的不对称性，这是很难克服的。 2.关于不对称性的问题也出现在VPPAW接头中。但是，通过更改VPPAW的形式，可以调整VPPAW接头的对称性和令人满意的焊接结果。使用正确的填充材料，不仅可以获得对称的微观结构，而且可以获得良好的焊接接头性能。

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