Thermal cycles of underwater welds in gravity arc welding were measured. The effect of welding parameters on cooling process, cooling rate at the bond line were investigated. Moreover, experimental formulas and nomographs were proposed to estimate cooling rate of underwater welds. Main results are summarized as follows: Underwater welds are cooled rapidly owing mainly to the heat transfer from surface of weld to the sorrounding water. So the cooling rate of underwater weld is much higher than that of open air weld. Welding parameters which have a considerable effect on cooling rate of underwater welds are weld heat input, water temperature, water pressure, thickness of base metal, welding position (slope of base metal) and location of weld bead. Colling rate and cooling times of underwater welds may be estimated by means of the given experimental formulas. (Wassmann)
On cooling of underwater welds
Ueber die Kuehlung von Unterwasserschweissnaehten
Journal of the Japan Welding Society ; 48 , 12 ; 63-69
1979
7 Seiten, 16 Bilder, 10 Quellen
Aufsatz (Zeitschrift)
Japanisch
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