Abstract
A fiber laser-MIG hybrid welding process was introduced to weld of commercially pure titanium (CP-Ti) butt-joints. Experimental investigations were carried out to examine the influence of the distance between laser and arc, focal position, gap and arc currents on weld bead top appearance, cross section, microstructure, microhardness and tensile properties of the welds. Optical metallography and Vickers microhardness test show that the weld metal has the coarsest grains and the highest microhardness compared with the HAZs and base metal. It is found that the processing parameters have a great influence on the bead dimension. Results show that the processing parameters has no influence on tensile strength of the welds, but have great influence on the elongation the welds. Tensile test shows that the joints obtained by hybrid fiber laser-MIG welding have better combination of strength and ductility.
