In welding 13 Cr steel most difficulties are encountered on account of welding cracks which would often appear in the hardened heat affected zone of the base metal adjacent to the weld.
In view of this fact the author was, in welding, of a tank of the steel, of opimion that it is in the best way to achieve the sucessful welding to minimize the range of hardened zone and the peak of thermal stress and that the properties of the material in the hardened zone are rather less important
Starting from the abowe-mentioned thonght we tried to weld the tank, and has succeed it.
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