Laser welding of Ti-5Al-5V-5Mo-3Cr

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Journal titleCanadian Metallurgical Quarterly
Pages263272; # of pages: 10
SubjectBase metals; Butt joints; Concomitant reduction; Continuous Wave; Defocusing; Dendritic morphology; Full penetration; Fusion zones; Local strains; ND : YAG lasers; Nd:YAG laser welding; Process window; Three-dimensional deformations; Ti-5Al-5V-5Mo-3Cr; Ultimate tensile strength; Underfills; Weld quality; Welding speed; Aluminum; Chromium; Defects; Dissolution; Heat affected zone; Laser beam welding; Molybdenum; Neodymium; Neodymium lasers; Tensile strength; Titanium; Titanium alloys
AbstractTi-5Al-5V-5Mo-3Cr butt joints were welded using a 4 kW continuous wave Nd:YAG laser. The effect of welding speed and defocusing distance on the weld quality was investigated. Welds with full penetration were achieved at a defocusing distance ranging from-1 to 0 mm and welding speeds from 2·25 to 6·0 m min -1. Underfill and porosity were the two main defects most frequently observed; however, within the optimum process window, these defects could be maintained to meet aerospace specification tolerances. The fusion zone consisted entirely of retained β with a refined dendritic morphology. Compared with the bimodal α+β microstructure of the base metal, dissolution of the α phase in the heat affected zone and the presence of entirely metastable/retained β phase in the fusion zone were observed, which led to a significant decrease in the HAZ and FZ hardness. To determine the tensile properties of the welds, an automated three-dimensional deformation measurement system was used to measure the local strain in the weld region. The yield strength and ultimate tensile strength increased with welding speed, achieving a maximum joint efficiency of 75%, albeit with a concomitant reduction in the ductility. © 2011 Canadian Institute of Mining, Metallurgy and Petroleum.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Aerospace Research
Peer reviewedYes
NPARC number21271093
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Record identifierd8452ea0-f303-4abd-8240-d6689297e4ab
Record created2014-03-24
Record modified2016-05-09
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