Use of filler wire for laser welding of Ti-6Al-4V

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Journal titleCanadian Metallurgical Quarterly
Pages320327; # of pages: 8
SubjectBase metals; Bead geometry; Continuous Wave; Excellent corrosion resistances; Filler addition; Filler wire; Fusion zones; Gap widths; High specific strength; Joint gap; Laser welds; Microindentation hardness; ND : YAG lasers; Parent metal; Sheet thickness; Thick sheets; Ti alloys; Ti-6al-4v; Underfills; Aerospace industry; Aluminum; Corrosion resistance; Hardness; Laser beam welding; Mechanical properties; Microstructure; Titanium alloys; Welds; Neodymium lasers
AbstractOwing to the high specific strength and excellent corrosion resistance, Ti-6Al-4V has been widely applied in aerospace industries. In this study, the welding performance of 3·2 and 5·1 mm thick Ti-6Al-4V sheets was studied using a 4 kW continuous wave Nd:YAG laser. It is found that the use of filler wire, matching the parent metal composition, can bridge the joint gap and produce full penetrated welds up to a width of 0·6 mm without cracking. The laser welds were characterised in terms of the bead geometry, defects, microstructures and hardness. With increasing joint gap, the percent porosity area increased, reaching just over 1% of the fusion zone area at a gap width of 0·6 mm for the 3·2 and 5·1 mm thick sheets. The maximum underfill depth in the Ti-6Al-4V laser welds was about 5%or 7%of the sheet thickness for the 3·2 and5·2 mmthick materials, respectively, meeting the AWS D17-1 specification. The microindentation hardness was maximum in the fusion zone and sharply decreased through the heat affected zone until reaching the base metal value. © 2012 Crown in Right of Canada.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Aerospace Research
Peer reviewedYes
NPARC number21269504
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Record identifier2a10c64b-10e6-4794-b88e-fcdb6fc388ff
Record created2013-12-12
Record modified2016-05-09
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