Abstract
One side welding of butt joint of pure titanium rods (JIS type II) was performed by the direct current TIG (tungsten innert gas arc) welding. Formation of fusion zone was influenced by the welding current, arc length, and arcing time. Welding time with full penetration and without burn through was set for each welding current. One or two pits were found in the surface of fusion zone when the welding was made, but they could easily be repaired. Welding could be done with little contamination when the welding part was sealed well by argon gas, and good mechanical properties were obtained with Hv 155, 428 MPa in tensile strength, 22 percents of elongation
