Butt welding machine

Details Butt welding machine Butt welding machine

B - Operations, Transporting

23

K

327/97

B23K 11/00 (2006.01) B23D 65/00 (2006.01) B23K 11/04 (2006.01) B23K 11/24 (2006.01)

Patent

CA 1246689

-22- ABSTRACT OF THE DISCLOSURE Flash-butt welder in which the piston rod of a pneumatic cylinder is connected to one end of a pivotable lever arm. A pneumatic system sequentially supplies air at two different pressures to the cylinder. Fixed and movable platens, each with a work piece clamping jaw, are fitted onto a unitary shaft which is mounted in laterally spaced and generally parallel relationship with the pneu- matic cylinder. The movable platen is moved by the oppo- site end of the lever arm along the shaft toward the fixed platen. The movable planten includes a laterally extend- ing arm portion-for angular orientation of the platen on the shaft. A switch is disposed to be actuated by the lever arm as it advances to a predetermined position which energizes a solenoid valve to supply substantially higher pressure air to the cylinder. An hydraulic cylinder, dis- posed in spaced parallel relation to the shaft, includes a piston rod engaged with a pivotable linkage carried by the arm portion of the movable platen. The hydraulic cylinder controls the speed of movement of the movable platen toward the fixed platen during flash welding of the work piece. A pivotable latch mechanism is disposed for re- leasably retaining the linkage in a fixed angular position and to release the same so that the controlling effect of

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