SynopsisThe quality of chromium, chromium-molybdenum and austenitic stainless steel tubes manufactured by an electric resistance welding (ER W) is highly dependent on the sophisticated technologies of non-oxidizing welding, precise control of welding energy and smooth cutting of inside flush. In this report a newly developed manufacturing technology for ERW alloy steel tubes is described on the following items; oxygen content in the welding atmosphere for a non-oxidizing welding and its control equipment, appropriate welding energy and its control system and a high performance impeder.Furthermore, the quality of the mass-produced ER W alloy steel tubes by the new technology is investigated focusing on their corrosion resistance, high temperature creep rupture strength and fatigue strength.
Synopsis A new welding process has been introduced in the manufacture of largediameter UOE pipes at the Kimitsu Works, JV'ippon Steel Corp. The new process includes the following methods which have been developed on the basis of fundamental research. (1) Observation of molten pools by X-rays was made during welding to find effective means for the prevention of undercuts. Multiple electrode welding is successfully applied to prevent the undercuts because o f its dispersion of the arc in the direction o f welding line. (2) Four wire welding has been adopted in place of three wire welding to increase the welding speed without loss of the toughness. (3) Metal inert gas welding can be combined with submerged arc welding to manufacture the line pipes for low temperature service. (4) A flux cored tubular wire with melt-type flux is used for large heat-input welding.
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