Edgar;

The gentlemen have a point regarding the number of phases, single or three phase input.

Check the nameplate of the machine to verify the input requirements pertaining to single or three phase.

If you have a three phase machine, you can't use it with single phase input, i.e., residential power. However, if you have a single phase welder, it can be used with either single phase or three phase power supplies.

Also check your power leads. Judging by what looks like scorch marks, they appear to have overheated at some point. It might be a good idea to pay an electrician to check the machine and swap it over to the new voltage. Judging by your question, you are not familiar with wiring diagrams and you haven't played with switching the bars. If you don't know what you're doing, the machine can suffer and you as well when you fire it up for the first time. There's nothing wrong with asking and paying for help from a professional.

Best regards - Al