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论文类型：期刊论文

发表时间：2010-11-01

发表刊物：MATERIALS RESEARCH INNOVATIONS

收录刊物：SCIE、EI、Scopus

卷号：14

期号：5

页面范围：405-409

ISSN号：1432-8917

关键字：Laser weld bonding; Plasma; Penetration; Recoil pressure

摘要：Laser weld bonding (LWB) is a new hybrid technique combining adhesive bonding with laser seam welding, and can achieve higher joint strength than adhesive bonding or laser welding, respectively. Its recent introduction and, thus, limited application means that, as yet, reasonable explanations have not been put forward for the new physical phenomena observed in this hybrid technique. A remarkably deeper penetration can be performed in LWB than that in laser welding direct and the added adhesive also makes the laser induced plasma shape more concentrative and its direction varies. The main reasons for these phenomena are that the adhesive induced gas can exert high recoil pressure to the lower sheet molten pool, resulting in increase in the keyhole depth. The adhesive induced gas can concentrate the laser induced plasma and help change the direction. Therefore, the plasma absorption effect on laser reduces and this can also help increase penetration.