Thermamax TSA 400 AC ARC welder

[Toi]

Item: Thermamax TSA 400 AC ARC welder transformer
Age: Unknown
Price: R3000
Warranty: None
Packaging: None, does not include the power plug or any cables
Condition: Well looked after, just dirty from storage
Location: Benoni
Reason: Storage cleanup
Shipping: Too heavy, its massive
Collection: Sure

FYI
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[Toi]

Bump

 

[Skalabala]

But how to make this a step up transformer?