ELECTRIC RESISTANCE WELDING MACHINE

摘要

A machine for the intermittent electric resistance welding of a workpiece which advances continuously during the welding process between one or more pairs of welding electrodes. Of the two electrodes forming each pair at least one is mounted on a drive shaft extending parallel to the surface of an advancing workpiece perpendicular to its direction of advance. This electrode has two or more electric contact surfaces for application to the workpiece spaced apart equiangularly around the periphery of the electrode. The drive shaft is driven through a gear system which gives the drive shaft a complex rotational movement whereby each working contact surface of the electrode follows the trochoidal path including a substantially straight part alongside the path of advancement of the workpiece. Welding takes place at each contact surface while the contact surface is moving along this part of its trochoidal path in contact with the workpiece.