method and device for the manufacture of two parallel längsstäben and sprossenartig zwischengeschweißten querverbindern existing components made of steel

摘要

The invention relates to the welding of transverse rungs between longitudinal rods to form steel reinforcement, for concrete, known as "Bi-Steel." The rods are fed convergently and continuously through a resistance welding machine, the transverse rungs being successively positioned between the rods. A pair of welding electrodes are thrust from opposite sides against the rods to clamp each successive rung in position during welding by sequential spot welding. Each electrode travels around a closed path such that the electrode travels along with the rods when in contact therewith. The contact between the electrodes and the rods is preferably rolling contact so that any discrepancy between the speeds of the rods and of the electrodes causes rolling rather than sliding of the electrodes along the rods.