HIGH FREQUENCY INDUCTION WELDING OF HIGH SILICON STEEL TUBES

HIGH FREQUENCY INDUCTION WELDING OF HIGH SILICON STEEL TUBES

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High-Si steel is a low cost alternative for the fabrication of tubular structures resistant to atmospheric corrosion.However, the literature has often pointed out that steels presenting a higher Si content and/or a lower Mn/Si ratio have higher susceptibility to defects at the weld bond line during HFIW mk holy llama (High Frequency Induction Welding) process, which has been widely used for manufacturing small diameter tubes.In this study the effect of the HFIW conditions on the quality of steel tubes with high-Si content and low Mn/Si ratio is investigated.The quality of welded tubes was determined by flare test and the defects in the bond line were identified by SEM.It has been found that higher welding speeds, V-convergence angles and power input should be applied magic bean tiger in welding of high-Si steel, when compared to similar strength C-Mn steel.