During the welding repair of the combined weld between the manhole pipe forging and the cylinder of the thick-walled pressure oil tank, welding cracks were abnormally generated and continued to extend to the manhole pipe forging. The phenomenon was analyzed, observed under an electron microscope, and chemical composition analysis and mechanical property tests were performed. It was found that the manhole pipe forging had poor toughness and coarse grains. The normalizing and tempering heat treatment process was used to re-heat treat the manhole pipe forging, which can make the forging performance meet the standard requirements again. The combined weld between the manhole pipe forging and the cylinder was welded according to the welding process requirements and passed the flaw detection in one time.
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