Choosing a power supply, breaker amperage and wire size for a 220V welder
US Power grid?

Is it correct to plug it into a 15A circuit is easily answered by the manual. 

What is the input current listed in the manual or on the Welder dataplate?

And 220V will only come from a 15A circuit if your house has one wired (NEMA 6-15 or L6-15 Socket) to an appropriate ganged circuit breaker and the welder has that plug installed. 

DO NOT CHANGE THE PLUG ON THE WELDER!!!

Have the appropriate circuit installed to match to what the welder expects for input voltage and current if you do not already have it available.

Given past experience, it will be 220V and a 30A or higher circuit with appropriately sized wire for current and distance to the socket and matching ganged 220V circuit breakers. Ampacity charts need to be consulted.

NEMA power sockets to help identify what your SMAW welder is expecting for input current.



NOTE: While the NEMA 6-15 and NEMA 6-30 look similar, the 30A plug is larger in diameter.