Will a 230 v welder work with 2 30 amp fuses?

That depends entirely on the current draw of the welder.

A small welder will work fine with 30 amp fuses, but make certain that the house wire is at least 10 Ga if you'll be running 30 amps through it.

If you're putting 30 amps through any wire smaller than 10 Ga, you run a very high risk of burning your house down.

If you aren't completely conversant with electrical codes and applications, you should consult with a qualified electrician or handyman (although some would argue about the handyman)

You may THINK that contracting out electrical work is expensive, but having your house burn down is FAR MORE expensive.