Laser-arc hybrid welding of T-type structure of titanium sheet

Low powered laser-arc hybrid welding was used to weld T-type structure of titanium sheet.The welding joints were investigated via the optical microscopy,X-ray diffractometer.Results showed that laser could induce arc and enhance the penetrability of arc in laser-arc hybrid welding process and welding of T-type structure of titanium sheet was easily achieved.The close ripples form on the top surface of the welding seam,and the welding joint is full-penetration and gentile on the back.The welding seam is made up of α'-phase and β-phase.The acicular α'is loose and disheveled because of the stirring effect of pulsed laser,pulsed TIG,spray of metal vapor and plasma.The contents of Al and Mn are maintained steadily,and there is no component segregation.