| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding rod with which weld metal having not only excellent strength at high temperature but also extremely good toughness and the soundness of a joint as regards the coated arc welding rod which is used for the steel for fire-resisting construction excellent in fire resistance up to 800°C. SOLUTION: By combining a coating material the composition of which is optimized by making Mo, Nb and V indispensable and a steel core wire the component of which is similarly optimized and making into the welding rod the coating rate of the coating material of which is limited to 25-45%, the weld metal having not only the excellent strength at high temperature but also extremely good toughness and the soundness of the joint is obtained. COPYRIGHT: (C)2007,JPO&INPIT
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