| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.33 ( January 1996 ) Welding, Logistics, and Environmental Engineering ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| High-Efficiency Submerged Arc Fillet Welding
Process for Heavy Section T-Joints Tadamasa Yamaguchi, Saburo Hayashi, Matsushige Nakajima |
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Synopsis : To enable a high-efficiency welding process for heavy section T-joints, welding materials and welding conditions were examined from the viewpoints of penetration depth and weld defects, especially weld metal cracking. The most appropriate submerged arc welding materials and welding method for welding with one pass per side up to a 25-mm-thick web without groove preparation and up to 80-mm-thick web with groove preparation were developed. The maximum allowable carbon content of the base metal for preventing hot cracks was determined by the restraint cracking test to be 0.18 mass% in the case of a 25-mm-thick web without groove preparation and 0.14 mass% in the case of a 80-mm-thick web with groove preparation when low-C wire KW-50 was used. The mechanical properties of the weld metal satisfied the requirements for 490 MPa grade high tensile strength steel, although the weld heat input was much larger than that in the conventional welding method. The T-joints made by the new method with a web thickness of 20 mm without a groove showed higher fatigue strength than conventional welded joints made by the multipass welding method. |
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