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Report No.
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Development of resistance welding process (4); Preparation of pressuring enclosed creep test specimen of 7A mateial)

Endo, Hideo; Seki, Masayuki; not registered; not registered; not registered

(1)Purpose. Mechanical strength in the position welded by resistance welding system was examined in 1999. The test specimens were destroyed in the welding position in a shorter time than expected in the creep tsst. Therefore, test specimens were prepared to evaluate the cause of destruction. (2)Procedure. Inner-pressure enclosed creep test specimens were prepared by resistance welding method. Cladding material with low deviation of thickness and high re-crystallization rate was used. Heat treatment after resistance welding was performed to remove the influence of residual stress and the precipitation of carbides. (3)Summary of result. (a)Before preparation of specimens, the welding condition was fixed. Three test specimens were prepared. Two specimens without heat treatment were transported to MMS in Oarai Engineering Center on Aug, 4, 2000. One specimen with heat treatment was transported to MMS after evaluating the residual stress to get optimum heat treatment condition. (b)Specimens were prepared with welding end plugs to both ends of ferritic ODS cladding. Enclosing sides were welded with highly strong Ferritic/Martensitic steel end plugs. The other sides were welded with ferritic ODS end plugs. (3)Some kinds of electrical wave data were obtained during performing welding. position was evaluated with supersonic detector after performing welding. (4)Mechanical strength of welding position in high temperature 800$$^{circ}$$C was confirmed to be equal to or larger than that of cladding material. (4)Conclusion. The highly qualified specimens in the present were successfully prepared.

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