Research and Development > JFE TECHNICAL REPORT >JFE TECHNICAL REPORT No.20 March 2015 - Special Issue on “Steel Plates” and “Welding and Joining” > Multiple-Electrode Submerged Arc Welding Process with Low Heat Input

No.20 March 2015 - Special Issue on “Steel Plates” and “Welding and Joining”

Multiple-Electrode Submerged Arc Welding Process with Low Heat Input

KOZUKI Shohei      HAYAKAWA Naoya      OI Kenji

Abstract

In recent years, mechanical properties of weld joint for natural gas transportation U-ing O-ing expansion (UOE) pipes have been more stringent. JFE Steel developed a new submerged arc welding (SAW) process for high-strength and heavy wall thickness UOE pipes. A new SAW process which can reduce heat input of 25% due to its high deposition rate and deep penetration is performed with multiple electrode SAW using small diameter welding wire on lead electrode. Improvement of heat affected zone (HAZ) toughness in seam welding on API X65 (API: American Petroleum Institute) heavy wall linepipe and refinement of prior austenite grain size in HAZ was achieved in order to reduce its heat input.

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