Laser offset welding of AZ31B magnesium alloy to 316 stainless steel

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• 作者：G. Casalino^a ; ^{g.casalino@poliba.it} ; P. Guglielmi^a ; V.D. Lorusso^a ; M. Mortello^b ; P. Peyre^c ; D. Sorgente^d
• 关键词：Laser offset welding ; Magnesium alloy ; Titanium alloy ; Dissimilar butt weld
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：242
• 期：Complete
• 页码：49-59
• 全文大小：6618 K
• 卷排序：242

文摘

In this paper, the feasibility of using a fiber laser to perform a dissimilar metal joining was explored. AZ31B magnesium and 316 stainless steel were autogenously joined in butt configuration. The weldability between different materials is often compromised by a large difference in thermal properties and poor metallurgical compatibility. Thus, the beam was focused onto the top surface of the magnesium plate, at a certain distance from the interfaces (offset), and without using any interlayer or groove preparation. Such a method was called laser offset welding (LOW). Results proved a very good capability. The ultimate tensile strength exceeded the value of 100 MPa, since a resistant and thin layer of hard intermetallic compounds is formed within the fusion zone. The rupture was observed within the magnesium side, far from the centerline. The metallurgy of fusion zone indicated the effectiveness of phases coalescence, without mixing at liquid states. LOW was demonstrated to be a promising technique to join dissimilar metal welds, being capable to produce an effective bonding with good tensile strength.