鑄鐵の熔接の基礎的研究(第 1 報) : 鑄鐵熔接部の組織変化

概要

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It is well known that weldability of cast iron is rather low, and especially, when hardened structure such as white pig iron is formed in weld part, it obstructs usual machining and increases crack sensibility. In this research, the structural change of gray cast iron, which was subjected to short time local heating similar to heating condition by welding, was cleared. And consideration was given to the structure in comparison with the structural distribution of weld part of gray cast iron. Chemical composition of the specimen is shown in Table 1,and the shape of local heating specimen is shown in Fig. 2 and Fig. 3. The following two methods were used for short time local heating. 1. Flash heating. 2. Resistance heating. The characteristic distribution of structure caused by above two methods are shown in Fig. 2 and Fig. 3. The main results obtained from this experiment were as follows; 1. Such structure as white pig iron was not found in the mother metal except in the fuzed zone. 2. Structural distribution of heated part by flash heating is shown in Fig. 2. 3. Structural distribution of heated part by resistance heating is shown in Fig. 3. 4. Structure of welded part was found to be almost similar to that of the spectmen which was heated by resistance heating.
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