Abstract
Eight kinds of Si-Mn steel electrodes and high-Al steel electrodes were manufactured for testing. High-Al and high-Si-Mn electrodes produced sound welds on semi-killed steel plates using carbon dioxide gas. Oxygen content of all weld metals obtained from high-Al electrodes were lower than that obtained from Si-Mn electrods. The mechanical properties of all weld metals were as follows. Tensile strength: 55.9-62.5 kg/mm2, Yield strength: 44.6-51.1 kg/mm2, Elongation: 23.8-32.0%, Tr15:<-60--40°C By using two kinds of high-Al electrodes, it was possible to make quality welds on 12 mm semi-killed steel plate with three kinds of joint preparation.
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