Electroslag rectification of defects - in castings or interrupted electroslag welds

摘要

Electroslag welding starting and/or restarting free from defects, generally for use with thick walled workpieces, by (a) treating the workpiece at a starting position in such a way that a cavity is produced free from defects and with a rounded and more or less smooth surface, (b) filling this cavity with slag which is then heated to such a high temp. that the material of the workpiece on the inner surface of the cavity melts in the slag, (c) introducing a fusible electrode of the same material as the workpiece into the slag, and (d) filling the cavity with the material of the fusible electrode, while passing current through this, whereby a continuous metallic transition results between the added material and the workpiece. Eliminates the rejection of castings with shrinkage cavities or welds with defective zones arising from interruption of the electroslag welding and the subsequent re-starting.