us3513682a method for processing welded tube google

MAC STEEL has floor-type milling-boring nachine, portal-type processing center, vertical lathe, deep-hole drilling machine, nulti-drilling machine and planer, which are multi-standard, high-precision and multi-function.
MAC STEEL has a wealth of machining experience and cases, such as the processing of tube sheets, food machinery, papermaking equipment, tank storage trucks, large oil tanks, pressure vessels, etc.

US9004341B2 - Method for producing welded steel pipe and

Provided is a method for producing a welded steel pipe having excellent buckling resistance. The method for producing a welded steel pipe according to the present embodiment includes steps of:preparing a welded pipe, and expanding the welded pipe over the entire length thereof by using a pipe expanding head such that an undulation wavelength ratio D defined by Formula (1) is not more than US6350533B1 - Welded sheet metal component - Google A sheet metal component, obtained by press-forming a one-piece metal sheet comprised of two metal sheets into a desired shape, has an expanding portion having an external appearance varying in dependence on a weld state of a weld portion of the one-piece metal sheet at which the two metal sheets are welded at their confronting ends. In manufacturing the sheet metal component, the one-piece

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