COLD PRESSURE WELDING METHOD AND MACHINE

摘要

The machine is provided with a set of two pairs of die halves (60, 62) mounted in a framework on hydraulically actuated piston and cylinder assemblies. The die halves (60 and 62) of each pair are relatively radially reciprocable to grip or release a workpiece (102, 104) and the two pairs of die halves are relatively axially reciprocable to effect cold pressure welding together of end portions of the workpieces (102, 104). Adjoining end faces of the die halves are formed with nose portions (100) having inner anvil edges for effecting welding flash removal from the workpieces. In operation, the die halves are moved in sequence to grip the workpieces; to urge the ends of the workpieces together to form a cold pressure weld upset zone; to release the workpieces; to grip one of the workpieces; to urge the gripped workpiece axially relative to a pair of anvil edges to clear flash material from the upset to maintain the cross-sectional area at the weld upset zone substantially constant; and to re-position the upset weld zone centrally of the nose portions to repeat the sequence. Removal of the flash material intermediate consecutive weld upsets is effected in alternate directions. The anvil edges may be staggered, angled or of helical form to enhance the shearing effect to clear the flash material from the upset weld zone.