LOW HYDROGEN TYPE COVERED ARC WELDING ROD

• Main Authors: HIDAKA TAKESHI, KITAGAWA YOSHIHIKO
• Format: Patent
• Language: English; Japanese
• Published: 05.01.2017
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a low hydrogen type covered arc welding rod excellent in crack resistance, strength and toughness of welding metal, having excellent welding workability in the whole attitude welding, and excellent in hygroscopicity resistance and fixability of a coating agent, in welding of high tension steel having bearing force of 690 MPa class or more.SOLUTION: In a low hydrogen type covered arc welding rod of coating a coating agent on a steel core wire, and in the coating agent, the content per welding rod total mass is regulated on the sum total of a COconversion value of metal carbonate, an F conversion value of metal fluoride TiO, ZrOand AlO, an Li conversion value of an Li compound, an Na conversion value of an Na compound and a K conversion value of a K compound, and the content per welding rod total mass is regulated on an Si conversion value of the sum total of Mo and Cr and the sum total of C, Si and SiO, and Mn and Ni.SELECTED DRAWING: None 【課題】耐力が６９０ＭＰａ級以上の高張力鋼の溶接において、溶接金属の耐割れ性、強度及び靭性に優れ、全姿勢溶接における良好な溶接作業性を有し、被覆剤の耐吸湿性及び固着性に優れた低水素系被覆アーク溶接棒を提供する。【解決手段】鋼心線に被覆剤が塗布されている低水素系被覆アーク溶接棒において、被覆剤において、金属炭酸塩のＣＯ２換算値、金属フッ化物のＦ換算値、ＴｉＯ２、ＺｒＯ２、Ａｌ２Ｏ３、Ｌｉ化合物のＬｉ換算値、Ｎａ化合物のＮａ換算値とＫ化合物のＫ換算値との合計についての溶接棒全質量あたりの含有量を規定し、被覆アーク溶接棒全体において、ＭｏとＣｒとの合計、Ｃ、ＳｉとＳｉＯ２との合計のＳｉ換算値、Ｍｎ、Ｎｉについての溶接棒全質量あたりの含有量を規定することを特徴とする。【選択図】なし