| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a thick-walled electric resistance welded tube excellent in the properties of a weld zone, by which production of weld defects in the thick-walled electric resistance welded tube is stably suppressed without greatly increasing capacity of a power source. SOLUTION: In the method of manufacturing the thick-walled electric resistance welded tube excellent in the properties of the weld zone, a groove in which the ratioα/t of the groove depthα[mm] of the groove to the thickness t is≥0.03 and the taper angleθ[°] of the groove is 4-86°is provided on the end faces of the side parts of the thick steel plate or a steel strip of≥15.4 mm in the plate thickness t and, the plate thickness t, the groove depthαand the taper angleθof the groove satisfy:α/t <3.43<θ. It is preferable that the taper angle [°] of the groove is < 60°. COPYRIGHT: (C)2011,JPO&INPIT
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