A portable resistance welding gun was used frequently in the past but has seen less use with the introduction of the robot transgun. The portable gun is suspended from an overhead trolley by cables which carry most of the weight. The gun consists of the electrodes and force system. The portable gun transformer is located generally overhead and the power is transmitted by kickless cables (low impedance/water cooled) to the gun. These systems are still in use for respot/rework, remote robot and manual guns.
PORTABLE GUN & TRANSFORMER
PORTABLE GUN TRANSFORMER
Portable gun transformers are AC and available in sizes from 50 to 200 KVA (rated at 50% duty cycle)
Primary Voltages of 480 & 575V @ 60 Hz are normal
Secondary connections are to designed to accept low reactance (kickless) welding cables
The transformer comes with Parallel bars installed but series bars are included
The transformer is prepared for overhead mounting
They are fully encapsulated for long life.
Reference: RWMA Resistance Welding Manual- 4th Edition
Roman Manufacturing Inc.