Thursday, September 4, 2014

Steel tube temperature control

Straight seam welded steel pipe secondary effects of high frequency eddy current temperature by thermal power, according to the formula, the impact of high-frequency eddy current frequency by secondary thermal power, thermal power and eddy current is proportional to the square of the frequency of encouragement; and encourage current frequency but also by encourage the voltage, current and capacitance, inductance. Frequency straight seam steel encouragement and encouragement circuit capacitance, inductance is proportional to the square root, perhaps with the square root of the voltage, current, just change the circuit capacitance, inductance, or voltage, current, frequency can be altered to encourage the size, in order to reach control means soldering temperatures. On low-carbon steel, welding temperature control in 1250 ~ 1460 ℃, can be satisfied with the tube wall thickness 3 ~ 5mm penetration request. In addition, the soldering temperature welding speed can also be achieved through conditioning. Straight pipe joints should be fixed as close to the high-frequency induction loop squeeze roll position. If the squeeze roll farther away from the induction coil, ineffective heating work longer, wider heat-affected zone, weld strength landing; conversely, lack of weld edge heating, extrusion molding after bad. High-frequency straight seam steel pipe welded pipe unit into the strip, the multi-channel roll rolling, and gradually rolled strip steel, round tube there is ashamed constitute gap adjustment reduction squeeze rollers, so that the weld gap rests in the 1 ~ 3mm, and weld the ends flush.

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