Porosity Caused by Hydrogen in Horizontal Fillet Welding

概要

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In order to investigate the behavior of porosity caused by hydrogen in horizontal fillet welding, the growth and the distribution of porosity, were studied using flux coated electrodes with various water contents. 1. Growth of porosity The growth of porosity becomes most remarkable when the hydrogen content of the weld is in a certain value, i.e. 15-17 cc/100 gr diffusible hydrogen content. At higher hydrogen content, the pores become smaller. 2. Distribution of porosity According to the measurements of length diameter of pore, pores in a weld may be classified into following types : A. Pores with length shorter than l_1 (≈1.2 mm) B. Pores with length longer than l_2 (l_2<l_1) And the pores with length l_1-l_2 are very few. These phenomena were investigated assuming a growth mechanism which was obtained by the relationship between tendency of porosity formation and behavior of molten metal.
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