Three defect types in friction stir welding of aluminum die casting alloy
Three defect types in friction stir welding of aluminum die casting alloy
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DOI：
10.1016/j.msea.2005.09.072
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发表时间：
2006-01-15
期刊：
影响因子：
6.4
通讯作者：
Nakata, K
中科院分区：
文献类型：
--
作者：
Kim, YG;Fujii, H;Nakata, K
针对不同的压入力，研究了铝合金的最佳搅拌摩擦焊工艺条件。刀具下压力越大，搅拌摩擦焊最佳条件的范围越宽。根据FSW条件，形成以下三种不同类型的缺陷。(1)由于热输入过多而产生的大量飞边;（2）由于热输入不足而产生的空洞或沟槽状缺陷;（3）由于异常搅拌而产生的空洞。关于异常搅拌，可以清楚地看到，搅拌区中前进侧的顶部形状完全不同。对于这种类型的缺陷，工具插入下压力的影响很小，尽管由于热量输入不足导致的缺陷尺寸随着下压力的增加而显著减小。(c)2005 Elsevier B. V.保留所有权利。
For different tool plunge downforces, the optimum FSW conditions of aluminum die casting alloy were examined. The higher the tool plunge downforce is, the wider the range of the optimum FSW conditions is. The following three different types of defects are formed, depending on the FSW conditions. (1) A large mass of flash due to the excess heat input; (2) cavity or groove-like defects caused by insufficient heat input; and (3) cavity caused by the abnormal stirring. As for the abnormal stirring, it is clearly seen that the shape of the top part on the advancing side in the stir zone is completely different. For this type of defect, the effect of the tool plunge downforce is small, though the size of the defect due to insufficient heat input significantly decreases with the increasing downforce. (c) 2005 Elsevier B.V. All rights reserved.