Abstract
Surface temperature near the rear end part of molten pool in girth TIG welding for 2 mm thick, 25.4 mm diameter stainless steel tube was measured with a PbS infrared radiation pyrometer. Effects of welding position and distance from arc center to a measuring point on the relation between the surface temperature and the reverse side bead width were investigated at down-hand, vertical down, over head, vertical up welding position of orbital TIG welding.
Temperature near the rear end, part of molten pool becomes high in order down-hand, vertical up, vertical down, over head welding position under the same reverse side bead width condition. Mutual correlation exists at each welding position between surface temperature at the position 5-10 mm away from the center of the arc and the reverse side bead width. It indicates the possibility of adaptive control of the reverse side bead width by monitoring the temperature near the rear end part of molten pool during the TIG welding.
