Surface temperature near the end part of the molten pool in TIG arc welding for 2.3 mm thick mild steel plates was measured with a Silicon monochromatic optical pyrometer. Relationships between the surface temperature and the reverse side bead width were investigated under various conditions.
Results of this experiment are summarized as follows.
(1) The effect of TIG arc on the temperature measurement disappeared at the position about 10 mm away from the center of the arc.
(2) It was concluded from the results of measurements that the mutual relation existed between the surface temperature near the rear end part of the molten pool and the reverse side bead width.