The author has been interested in welding cracks of alloy steels for years and investigated them on all available occasions. But the questions of cracking are connected with properties of material, the stress and method of welding, and the scientific illustratoin of cranking remains uncertain.
In this report, judging from many facts which the author observed in cases of his inspection of welding factories for alloy steels and confirmed in his laboratory also, he made rough descriptions about welding cracks of alloy steels.
Namely, (1) welding cracks were classified with regard to their positions, (2) the relation between the crack in the welding-heat-affected zone, which occurs most frequently, among welding cracks, and the maximum hardness of that zone was discussed, (3) and occurrence-time of each welding crack was roughly stated.
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