Laser butt welding of NiTi to Ti6Al4V and Stainless Steel

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Superelastic alloys find relevant applications in tools and devices where joining to other materials is frequently required. However, their limited weldability especially due to the formation of brittle intermetallic phases constrains the success of the joints. Different approaches were tested to join NiTi to Ti alloys and stainless steel. Joining NiTi to Ti alloy led to the formation of Ti enriched intermetallics that were responsible for cracking. The mechanisms for intermetallic formation were identified and fracture surfaces were analysed and discussed. When joining NiTi to stainless steel it was found that the material impinged by the laser determined the weld pool shape and structure and it was better when the stainless steel foil was placed under the laser, because Nickel enrichment of the weld pool minimises cracking. The factors controlling the weld pool composition and, thus, the weld quality were investigated and discussed
Original languageUnknown
Title of host publicationIIW
Publication statusPublished - 1 Jan 2012
Event65th Annual Assembly and Int Conference of IIW -
Duration: 1 Jan 2012 → …


Conference65th Annual Assembly and Int Conference of IIW
Period1/01/12 → …

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