Abstract
From the viewpoint of the prevention from being cracked by welding, it is greatly significant to adopt a post heating process in order to bring down the hardness of the hardened part in the welding heat-affected zone. Though there may be various kinds of post heating process, it seems the easiest to make use of gas flames. It was, however, not easy to heat exactly the part containing weld metal and heat-affected zone below the Al transformation point or above the As transformation point or at any other desired temperature. But A process for local heating at constant maximum temperature with gas flames, which was published before by one of the authors, has made it quite easy. In this work, the outline of this post heating process was described first, and secondly the result of the experiment in which post heating of welded Dart of high tensile steel was done by using the equipment for this process was clearly shown.The experiment has confirmed that the hardened part in the welding heat-affected zone was surely softened by this process. Besides it was clarified that the hydrogen removal before immersion of welded part in glycerin was increased remarkably, if post heating is done just after completion of welding. But it goes without saying that the degrees of softening and hydrogen removal differ with the height of the maximum temperature and the proceeding rate of heating torch.
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