鋼の電弧熔接用電極棒被覆劑の研究(第 5 報) : 市販軟鋼用電極棒の被覆量と熔着鋼の機械的諸性質との關係

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Using 55 kinds of electrodes of mild steels of home and foreign make, the single V butt joints of mild steel plates were made by an alternating current welding machine, and the effects of quantity, thickness and ignition loss of the e'ectrode-coating on the mechanical properties of the deposited metals were investigated. The welding properties of the electrodes were at first observed and terminal voltages of the machine and melting times of the electrodes of constant length were also measured. After a radiographic examination of the welded part was made, apparent specific gravity, nitrogen content and mechanical properties of the deposited metal were measured. Microscopic examination was also made. From these experiments the following conclusions were drawn statistically. (1) As the quantity or thickness of coating increases, (a) terminal voltage of the machine and electric energy to melt a constant length of electrode increase, and (b) tensilc strength and yielding point of the deposited metal are nearly constant, while its elongation and shock value increase. (2) If the quantity of coating is constant, the elongation and shock value of the deposited metal increase as the ignition loss increases. The conclusions of (1,b) and (2) are mainly attributed to the amount of nitrogen and blow holes in the deposited matal, which depend upon the quantity or thickness of electrode-coating.
社団法人溶接学会の論文
1938-09-25