The squeeze rollers the synthetic steel pipe pressure welding with a high-frequency current skin effect and proximity effect www.hbmeide.com. ERW contact welded straight-seam pipe is the use of two electrodes or welding foot respectively in contact with the edge of the tube has been molded, using a high-frequency current generating skin effect and proximity effect of the welding current is concentrated in the V-notch, the V-shaped notch at metal instantly heated to welding temperature, a synthetic steel pipe welding pressure by squeeze rollers; ERW induction welding is the first hot-rolled coil by forming unit forming the tube when the tube from the induction coil (high-frequency The welder of the induction coil for generating a high frequency magnetic field through the high-frequency current), the tube will produce a high frequency induced eddy currents, the role of the re-use of high-frequency eddy current skin effect and proximity effect, so that the eddy current-intensive on the edge of the tube passing www.chaoyuegg.com