This study proposes induction heating as a new method to mitigate longitudinal bending distortion due to fillet welding during manufacturing built-up beams. With this method, longitudinal bending distortion can he controlled simultaneously with fillet welding, resulting in improvement of00 productivity and the quality of block assembly. Also, this study describes the mechanism of the longitudinal bending distortion and the effects of induction heating parameters on longitudinal bending distortion through numerical analysis and experimental results. The following results are obtained: 1. Based on the results from threedimensional thermal elastic-plastic analysis, the longitudinal bending distortion is produced by the welding moment (Mw), which can be obtained by multiplying the shrinkage force P(Qw) in the welded part by the distance (Nw) from the neutral axis on a cross section of the built-up beam to the welding heat source. Also, the magnitude of the longitudinal bending distortion increases as the shrinkage force and distance from the neutral axis to the welding heat source increase. 2. The longitudinal bending distortion induced by the bending moment due to welding can be mitigated by generating an induction moment (Mi) with the same magnitude as the bending moment, and orientating it in the opposite direction of the bending moment. Then, the induction moment (Mi) is generated by controlling the intensity of induction heat input and the distance (Ni) fiom the neutral axis to the induction heating source. 3. From the experiments performed to investigate the effects of intensity of induction heat input and its location on the longitudinal bending distortion, it is found that longitudinal bending distortion decreases as the temperature of induction heating becomes higher and the distance from the neutral axis to induction heating source increases. But there is a possibility of providing too much induction moment and in effect ending up with more distortion in the opposite direction. 4. By applying the temperature and location of induction heating obtained from the numerical analysis and experimental results to large T-section structures, it is concluded that longitudinal bending distortion can be controlled by the temperature and the location of induction heating for large T-section structures with dimensional changes.
Control of longitudinal bending distortion of built-up beams by hygh-frequency induction heating
Welding Journal, New York ; 88 , 2 ; 29s-34s
2009
5 Seiten, 14 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
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