Machine transformers vary in size from small 20 KVA to large 500 KVA, AC units. These water cooled stacked core transformers are ideal for press, seam and rocker arm welders.
RWMA Size 3 Machine Transformer
These transformers frequently have tap switches to expand the power options.
A press welder with a machine transformer is shown below.
Press Welder with Machine Transformer
Reference: RWMA Manual- Fourth Edition, Chapter 19
Roman Manufacturing Inc.
Taylor Winfield Technologies Inc.