| 摘要 |
A method for flash butt welding of annular workpieces, particularly chain links, in which the ends of the workpiece to be welded together, are preheated before flashing and upsetting by controlling the feeding force for the upsetting slide in several successive preheat time cycles. The feeding force during the first preheat time cycle is minimized during the first preheat time cycle and progressively increased during advancing preheat time cycles, dependent on the increase in force required for workpiece deformation. The feeding force may have a decreasing increment during advancing preheat time cycles. The feeding force may also have a stepwise increase per preheat time cycle. The feeding force may, moreover, have a continuous increase. |
