ON THE ISSUE OF CALCULATING THE POWER REQUIRED TO HEAT THE EDGES OF THE PIPE BILLET TO THE WELDING TEMPERATURE
DOI:
https://doi.org/10.5281/zenodo.18062827Keywords:
roll calibration, continuous pipe welding mills, high-frequency welding, pipe blank forming, single-radius calibration, double-radius calibration, oval calibration, edge pre-forming, corrugation, welded seam, electric-welded pipesAbstract
The article proposes a methodology for calculating the power required to heat the edges of a pipe billet to the
welding temperature during high-frequency welding of longitudinally welded pipes made from low-carbon and low-alloy
steels. The contact and induction methods of energy supply are considered, and the influence of the distance from
the inductor (or contacts) to the edge convergence point, as well as the configuration of magnetic cores, on energy
consumption and welding speed is analyzed.
The authors introduce power increase factors k_P1 (maximum) and k_P2 (minimum), which account for the uneven
distribution of surface current density along the edges, including cases of sharp and rounded edges, and the presence of
one or two magnetic cores. A formula is proposed for determining the average factor k_P as the half-sum of the extreme
values, as well as for calculating the required power P_кр, taking into account the variation of specific power along the
heating zone.
It has been established that the gap between the edges (and, accordingly, the angle of their convergence) significantly
affects the consumed power. It is shown that placing internal and external magnetic cores allows reducing the power at
minimal convergence angles of the edges; however, their effectiveness decreases in the zone of very small gaps.
The results of the work can be used in the design and optimization of equipment for high-frequency welding of pipes at
pipe mills.
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