薄板構造物の歪取りに關する研究(第 1 報) : 局部加熱緊張法による歪取りの機構に関する研究

概要

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Spot heat-treatment method is usually adopted in order to correct the distortion of welded thin steel plate structures such as shells of ships and cars. This is a method in which a part of distorted shell plates is quenched after being heated to 500℃-700℃ by oxy-acetylene flame. With the purpose of finding the most adequate operating conditions in this method, such as heating time, and diameter and pitch of heatnd zone, analysis was made of the mechanism of this method on the basis of our previous inveitigation concerning weld stresses. It was clarified that the points in and near the heated zone shrink in radial direction when quenching for correction becomes effective. The theoretical values for the radical shrinkage agreed with the measured results in the fundamental experiment as shown in Fig 12.
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