Method of cutting out part with making partially welded spots in wire-cut electrical discharge machining

A method of cutting out a part with making partially welded spots in wire electrical discharge machining comprising

• a wire electrode unwound from a source bobbin is threaded through a workpiece lying below an upper head and further a lower head lying below the workpiece in opposition to the upper head, and
• then the wire electrode is fed through a guide member lying downstream of the lower head towards a waste-wire hopper;
• comprising the steps of,
• changing electrical processing condition applied across the wire electrode and the workpiece from a cutting phase to a welding phase at more than one spot of a plurality of spots in a cutting path or kerf of a predetermined contour on the workpiece to fuse partially the wire electrode at the spots, and
• welding together the workpiece and the part cut out from the workpiece at the spots with using the fused wire electrode to make a coalescence,
• thereby keeping the cut-out part at the spots against falling away apart from the workpiece.