Al 鋼溶接棒(複合心線)に関する研究(第 1 報) : 溶着金属の性質におよぼす Al 量の影響

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In this paper, authers describe the results of some experiments on Al-steel electrode made of composite core wire, which is composed of mild steel tube and Al wire folded up in it. We deal with the following items, that is, melting behavior of composite core wire, chemical reactions between the coating materials and molten metal at elevated temperature, scaling and cracking test of weld metals. Conclusions were summerized as follows; (1) Al and steel in the composite core wire melt uniformly and make the homogeneous Fe-Al alloy in spite of their difference of M. P.. (2) The higher the coating percentage of lime-fluorite type electrode is, the higher Si and C in deposit metal are reduced from coating, and Al is oxidized, while Mn is not affected. (3) When Al content of deposit metal is less than 2%, oxidation resistance at high temperature is the same as mild steel, but at 4 to 7%, it equals to 18Cr-or 13 Cr- steel and upward 10%, it is more excellent to 18 Cr-8 Ni- steel. (4) Cracking tendency of welds is reduced with increase of Al content. The weld metal of higher Al content cracks at about 400 to 500℃, but that of the lower Al cracks even at room temperature.
社団法人溶接学会の論文
1961-12-25