二,三の冷間圧延鋼板のスポット溶接継手の比較について
1978 年 47 巻 2 号 p. 109-114
詳細
1978 年 47 巻 2 号 p. 109-114
The results of U-tensile tests of the welded joints of the carbon steel sheets containing more than 0.055 per cent carbon are reported in IIW Doc. III-481-73. The purpose of this investigation is to examine the characteristics of the cross-tensile test of the spot welded joints of three kinds of low carbon steel sheets containing less than 0.06 per cent carbon. The specimens to be welded are of 1.0 mm thickness and welded under the conditions of class A recomended from RWMA except for welding duration and the following results are obtained.
(1) There are several differences of the fracture characteristics at the cross-tensile test of spot welded joints of some carbon steel sheets, which correspond to the qualities of sheet according to JIS G 3141.
(2) The fracture modes, flat or button fracture, of spot welded joints are mainly dicided on the kinds of carbon steel sheets and the welding duration.
(3) The flat fracture of the spot welded joint results from the formation of the martensitic structure or the plana growth of nugget during the welding.
