Spot Welding Equipment -
Introduction
Spot welding machines may be classified as follows on the basis of mechanical construction:
1. Rocker-arm Machines,
2. Press-type machines,
3. Portable machines or Guns, and
4. Multiple-electrodes machines.
A standard spot welding machine possesses the following:
Basic Elements:
1. The frame, which is the main body of the machine and houses the transformer and tap switch.
2. An upper arm which is movable and a fixed lower arm.
3. Welding electrodes.
4. The electrical circuit consisting of a step down transformer which reduces the voltage and proportionally increases the current.
5. The different controls that adjust the magnitude of current, length of welding time, the contact period and the flow of cooling water.
