Abstract
Gas pressure welding has been widely used as a field welding process of rail and steel bar for concrete reinforcement. However, in the first place, a reasonable inspection method for gas pressure welds is seldom practiced. So we have developed a method of "bulge removal by hot shearing" which is effective for quality inspection of welded joints.
The present report explains the results of examining this method for quality estimation of welds. The results may be summarized as follows :
(1) The quality of gas pressure welds depends on local area expansion factor (α) and weld temperature (T). As these values increase, the quality of weld gets better.
(2) The fracture observation in fracture test helps to evaluate the quality of weld.
(3) Disappearance of flat fracture is owing to the carbon content of the base metal. Carbon is cansidered to reduce the oxides in interface.
