Experimental study on temperature of stainless steel joints by tungsten insert gas and laser-tungsten insert gas hybrid welding

AbstractTemperatures of 1Cr18Ni9Ti stainless steel joints by tungsten insert gas and laser-tungsten insert gas hybrid welding without or with different fluxes (B2O3, SiO2, TiO2 and CaF2) are measured by means of thermocouple thermometry. The measured results indicate that the temperature rise rate and peak temperature increase with the decrease of welding speed or the increase of welding current and laser power. Compared with the tungsten insert gas welding, the peak temperature of laser-tungsten insert gas hybrid welding increases about 100°C. Compared with the 1050°C without flux, the peak temperature significant increases (above 1100°C) with the different fluxes and the cooling rate is improved during the welding process. Weld penetration and depth-to-width ratio increase significantly with different fluxes. Maximum value reaches 5.12 mm and 0.53 in comparison with 1.91 mm and 0.15 without any flux, respectively.