| 摘要 |
PURPOSE:To make heat amt. and inner length dimension constant by adjusting an upsetting pressure in two stages strong and weak, executing an upset welding in a short time, utilizing the inner length dimension of a ink being contracted by forming a welding crest and cutting a heating power source with a limit switch prior to the completion of welding. CONSTITUTION:A pair of electrodes 15, 17 interposing both sides of the weld zone of an alloy steel made link 35, the cylinder 21 pressurizing the link from the side and the electric power conductor 23 heating the weld zone with electrification are owned. A cylinder 14 and the cylinder 21 for upsetting are driven via a pressure reducing valve 6 from an air source 1 and solenoid valve 10. In the welding equipment equipped with the limit switch 22 worked by the front and back movements of the cylinder an electric power conductor 23 is connected to a secondary side of a welding transformer 25 and a flashing circuit 27 is connected to a primary side via a thyristor switch 26. The variable resisters 30, 31 adjusting the secondary side current in strong and weak two stages are connected to this flashing circuit 27 and the pressure to the weld zone by the cylinder is pressurized in two stages strong and weak to execute upsetting welding in short time. The control of these circuits are executed by a sequence circuit.
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