60kg/(mm)^2 高張力鋼のエレクトロガス溶接(第 1 報)

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It is presumed that weld joint properties of quenched and tempered high strength steel of 60kg/(mm)^2 by electro-gas arc welding seem to present some problems as to the proper result since the process induces enormous heat input of 130,000 to 300,000 joule/cm and slow cooling speed. The tppical seven plates of Japanese manufactured quenched and tempered high strength steel of 60kg/(mm)^2 and the Arcos Vertomatic-G for electro-gas arc process have been used. The wire was flux cored type. The groove preparations was square groove. Respectively general technical tests on the weld efficiency and various studies by small size specimen on the heat-affected zone have been made. The result of the former test was satisfactory. The later test showed following : Decrease the strength and yield ratio in the coarsened zone of the refined zone side. The 2mmV notched charpy impact energy indicated minimum in the coarsened zone of the weld metal side. And the hardness decreased toward coarsened zone of the refined zone side and refined zone. However there is no difinite relation of maximum and minimum test value on different zone relative to the heat-affected result. To improve the notch toughness of weld metal, five kinds of wire have been tested, namely Mn-Si-Ni-Cr-Mo type, Mn-Si-3 Ni-Mo type, Mn-Si-Ni-Mo type and Mn-Si-Mo type. There has been slightly effective increase possible by alloy elements however not quite satisfactory. The fusion parts are greatly affected by the base metal. Good results can be achieved on both heataffected zone and weld metal with less heat input and V or Y groove preparations is prooved to be one of the offective design.
社団法人溶接学会の論文
1965-10-25

60kg/(mm)^2 高張力鋼のエレクトロガス溶接(第 1 報)

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