Flash butt welding machine - with sensors for all parameters affecting weld quality (OE 15.6.80)

摘要

A butt welding machine is equipped with a minicomputer for the automatic control of the start of the upsetting operation and the upsetting distance. A sensor at the output of the current transformer for the input to the primary winding of a welding transformer indicates the short-circuit duration. Another pair of sensors detect any slip of the workpieces in the clamps. Third sensor responds to the displacement of the servo valve rod (which controls the hydraulic clamp moving mechanism) relative to its housing. A command shaper is controlled by the minicomputer output. The presence of sensors for all possible defects ensures a consistent high quality of the butt welded joints produced by this machine.