Satoshi Kokura
Hitachi
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Quarterly Journal of The Japan Welding Society | 1986
Tsutomu Onuma; Fumio Hataya; Hiroshi Takayasu; Kohji Satoh; Satoshi Kokura
There are increaseing needs for the fabrication of hydraulic machineries which are used under the severe condition of cavitation. So, the anti-erosion weld deposits are usually overlaid on the position where the cavitation is likely to take place. However, there is large discrepancy that the surfacing weld deposits which has better weldability exhibit less erosion resistance. Increase in the hardness of the deposits is effective to improve its erosion resistance, while it spoils the weld-cracking avoidability of the deposits. In order to prevent the cracking of the deposits, it is necessary to increase its ductility. There should be a strong demand for the development of the surfacing weld deposits of the good combination of the erosion resistance and weldability.Investigations have been performed on the effects of the contents of carbon, manganese and nickel on the erosion loss and the elongation of the austenitic weld deposits containing 20% chromium and 7%cobalt. Results are as follows;(1) Erosion loss and its deviation increase as the nickel equivalent increases. It is necessary to limit the maximum of nickel equivalent less than 12.5% in order to assure erosion loss less than cobalt base alloy of low carbon content whose composition system is 0.06%C-19%Cr-9%Ni-15%W.(2) Elongation behaves likely to erosion loss. It is necessary to limit the minimum of nickel equivalent in order to assure the elongation more than 10%.(3) The erosion loss Cw (mg) and the elongation El(%) can be respectably estimated by the following experimental formulas. Cw=-64.6+115.60+10.1Mn+18.6Ni and El=-21.4+51.1C+2.5Mn+4.8Ni.(4) The weld deposits whose chemical composition system is 0.25%C-3%Mn-3%Ni-20%Cr-7%Co have good combination of erosion resistance and weldability.
Quarterly Journal of The Japan Welding Society | 1986
Hiroshi Miyake; Satoshi Kokura; Yutaka Takano
An algorithm and program for determination of welding parameters under given leg length, welding speed and length between tip and base metal by CO2 arc welding are proposed. The welding parameters were set to obtain the globular transfer.Calculated parameters were confirmed to given effective leg length and reinforcement by welding experiment.
Archive | 1992
Ichiya Sato; Takao Yoneyama; Hisanori Okamura; Satoshi Kokura; Minoru Yanagibashi
Archive | 1979
Eiji Ashida; Masayasu Nihei; Hiroshi Wachi; Akira Sato; Satoshi Kokura
Archive | 1984
Takashi Haramaki; Katsuhiko Shiota; Satoshi Kokura; Takao Funamoto; Akira Tomita
Archive | 1983
Hideo Suzuki; Satoshi Kokura; Osamu Asai; Kunio Miyazaki
Archive | 1981
Masayasu Nihei; Satoshi Kokura; Eiji Ashida; Yuzo Kozono; Akira Onuma
Archive | 1988
Takashi Haramaki; Mitsuo Nakamura; Satoshi Kokura; Takao Funamoto; Katsuyoshi Terakado
Archive | 1984
Takashi Haramaki; Katsuhiko Shiota; Satoshi Kokura; Takao Funamoto; Akira Tomita
Archive | 1972
Satoshi Kokura; Genzi Taki; Kiyoshi Watanabe