Fatigue Properties of Fillet Welded Joints in Piping System
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概要
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Fatigue tests have been perfomed on fillet welded joints between piping and sockets to investigate the effective factors such as welding methods and leg length of welds. The materials used were carbon steel for machine structural use (S25C) and carbon steel pipes for pressure service (STPG 38). The applied welding methods were GTAW and SMAW. Two types of covered electrodes were used such as low hydrogen type and ilminite type for SMAW. The conclusions obtained in this study are as follows: (1) As a matter of course, the fatigue strength of the joints by GTAW was higher than that of the joints by SMAW. In addition, the fatigue strength of the joints with low hydrogen type covered electrode was higher than that of the joints with ilminite type. (2) The critical size S/T (S: leg length, T: thickness of base metal) was about 1.2. (3) When the maximum tensile stress of the welded joints exceeds 147 MPa, it is better to select butt joints instead of fillet joints.
- 1993-10-01