HAZ and structural defects control in key-hole welding of titanium using a reptitively-pulsed Nd: Yag laser

Özet

HAZ, porosity and cracks were investigated when welding 0.9 mm thick titanium sheets using a 10 J pulsed Nd: Yag laser. The effects of welding speed, joints fit-up, shielding gas, and laser parameters are presented. For optimum welding quality, 0.25 m/min scanning speed, 10$\ell$/min gas flow rate and 72 Watt average power Were used. Welds of narrow heat affected zone (HAZ) with small level of porosity were obtained.