局所加熱による残留応力の除去について（続報）主として熔接材の簡易な残留応力除去法について

抄録

In the previous paper, the present authors showed that the residual stress restored in the cold worked specimen might be released by local heating. A similar treatment was applied to a welded steel plate and a satisfactory result was obtained. A low carbon steel plate (thickness=3 mm), electrically-welded was used as a specimen. The stress distribution in the specimen is shown in Fig. 1∼3, In the figure the individual parts to be heated are marked as a, b, c, AB, ect, the width of each part being 5∼10 mm. These parts were heated to 650° separately or at the same time. The results obtained are as follows: (1) When the part at which the distribution curve is very steep was heated, it was effective to release the stress as shown in Fig. 1. And when these parts were heated individually one after another, stress release was very remarkable, but if these parts or tensile stress area where heated at the same time, it was not effective at all. (2) If the temperature of heating was elevated to 1000° the effect was naturally far greater than that when lower temperature was applied.