Investigation of welding crack in micro laser welded NiTiNb shape memory alloy and Ti6Al4V alloy dissimilar metals joints

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• 作者：Chen Yuhua^a ; ^b ; ^{ch.yu.hu@163.com} ; Mao Yuqing^b ; Lu Weiwei^b ; He Peng^a
• 关键词：Dissimilar metals ; Micro laser welding ; Welding cracks ; Intermetallic compounds ; Fracture morphology
• 刊名：Optics & Laser Technology
• 出版年：2017
• 出版时间：1 June 2017
• 年：2017
• 卷：91
• 期：Complete
• 页码：197-202
• 全文大小：5340 K
• 卷排序：91

文摘

0.2 mm thick dissimilar metals between NiTiNb and Ti6Al4V are micro laser welded. The crack sensitivity of the joints is estimated and the reason of cracking was found. Three kinds of Ti2Ni, NbNi3 and AlNbTi2 intermetallic compounds are generated. Solidification crack, liquid crack, hot crack and crater crack are classified.