... the force of squeeze roller.And it uses induction welding to heat the longitudinal seam.That is ,feed ... → un-coiler → shearing and butt-welding → material accumulating → non-power leveling →mill-forming → high-frequency welding → removing burrs outside of weld seam ... saw,straightener,end milling equipment,hydrostatic testing machine,charge table,sack&bale machine,high frequency DC drag,product line ...