The Tack - welding is a machine that is used to generate weld points on the perimeter of the pieces of pipes to be joined after the bending phase. The machine can work with two variants: spot welding, with interruptions, or continuous welding. The diameter of the pipes can vary from 8" to 72" and thicknesses of up to 70 mm. NRCM S.r.l. also manufactures a semi-automatic tack - welding machine forsmaller sizes and limited production.