Straight seam welded steel pipe temperature is mainly affected by the impact of high-frequency eddy current heating power, according to the formula, high-frequency eddy current heating power by the frequency of the secondary effects of eddy current heating power with frequency proportional to the square encouraged; while encouraging current frequency but also by encouraging voltage, current and capacitance, inductance. Straight pipe joints and encouragement to encourage frequency circuit of the capacitance and inductance is proportional to the square root, perhaps with the voltage and current proportional to the square, just change the circuit capacitance, inductance, or voltage and current to change the size to encourage frequency, so as to achieve control of welding temperature. About low carbon steel, welding temperature control in 1250 ~ 1460 ℃, can reach 3 ~ 5mm wall thickness penetration requirements. In addition, the soldering temperature welding speed can also be done through conditioning.
High-frequency welding straight seam welded steel pipe will strip into the unit, the multi-channel roll rolling, strip and gradually rolled to form a gap ashamed round tube, adjust the amount of reduction squeeze rollers, so that the weld gap lies in the 1 ~ 3mm, make weld ends flush. Straight seam steel pipe should be as close to the high-frequency induction loop squeeze roller position. If the induction coil is farther away from the squeeze rollers, ineffective heating time is longer, wider heat-affected zone, weld strength landing; Conversely, lack of weld edge heating, extrusion molding bad.
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