| 摘要 |
Multiple upset, cold pressure, welding apparatus including (Fig. 2) a welding die set having two pairs of die halves (2) each formed with a longitudinal groove (4) in a split line face (8) providing a bore for effecting gripping of end portions (12) of first and second workpieces and reciprocable between the closed position in which the associated portion of the workpiece is gripped and an open position in which the associated portion of the workpiece is released and also being reciprocable in a direction parallel to the longitudinal axis of the workpiece to apply or relax a welding pressure across abutting faces of the end portions of the workpieces, each die being formed with a longitudinal groove (4) having outwardly diverging flanks terminating in a linear knife edge (6) bounding a recess (10) extending longitudinally parallel to the groove (4) in the split line face (8) of the die. Since, during clamping of the workpiece, any excess material deforms as flash (14), workpieces with end portions (12) of over-size or mis-shapen form may be clamped within the groove (4) without inhibiting the clamping effect or producing an unacceptable bursting force on the die halves. A satisfactory clamping effect is obtained over a larger tolerance band of workpiece dimensions than hitherto, thereby enhancing the versatility of a set of dies in respect of the range of workpieces which may be accommodated. |
