PRODUCTION OF THICKNESS-WIRE CIRCULAR TENSILE TEST PIECE

PURPOSE:To eliminate a burr otherwise left as a ring, by cutting the burr caused by the bonding of a pressure welding rod after the end of the turning of a base material to turn the base material continuously in an opposite direction. CONSTITUTION:First, a base material 1 is taper-turned to avoid the generation of a burr 4 and the resulting ring and then, a horizontal turning is performed in an opposite direction to enable the cutting of a burr 4 if any. This prevents the generation of a burr 4 and the resulting ring during the turning of the base material 1 completely. Combined with this, a subsequent burr turning is started near a bonded part of a pressure welding rod 2 including a turning of the base material part 1 to cut away a burr or an excess bead generated by a friction or weld bonding. This also can prevent a possible ring 5 otherwise generated during the finish turning in the conventional art perfectly.