電弧熔接の熱影響と高炭素鋼の熔接性

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(1) Relation between the Welding Condition and the Change of Properties of High Carbon Steels. Not only the hardened zone is detected in the welded part of high carbon steels, but sometimes also the welding crack appears in them. In this research the author has studied to find the welding conditious to mitigate hardening or to prevent weld crack. Three kinds of high carbon steel with 0.4%, 0.55% and 0.76% C respectively, have been subjected to various tests. The weld hardening and the crack generation are mainly affected by the carbon content and the cooling velocity. The more the carbon content in steel, the more the number of crack or the length of crack on bead. The cooling velocity, in welding practice, has two important factors i.e., the electric current and the welding speed. The author has found two kinds of crack or fissures on bead. The former is generated by the shrinkage stress, the transformation stress etc. and the latter is mainly caused by the transformation stress such as due to the local formation of martensite at comparative low temperatures. From the result of various tests it is concluded that we should apply such welding conditions as slow speed and low current as possible for preventing crack generation. (2) On the Building Up of Worn Tyres. As an example of practical application of the abovementioned tests, building up of worn tyres was executed in the experimental condition and this welding repair practice showed superior results on both sides of theoretical tests and practical uses.
社団法人日本鉄鋼協会の論文
1941-10-25

電弧熔接の熱影響と高炭素鋼の熔接性

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