Welding machine burn resistors

Hi there thanks for accepting me in the forum

A friend bring me a welding machine (brand profi) yesterday when open the switch the machine start smoking and stop I disassemble and find that had burn 6 of 10 mosfet irfp460 and the 7 resistors of 15ohm 1/2 I replace them all when I power on in seconds blow up one resistor shut down I replace the resistor but the same thing not in the same but in other place I change 5 resistance but still the same I can see anything else be burned any ideas what happen ? need to replace the resistor with 15ohm 1w?

I appreciate any help

Looks as though the machine should still function. looks like the gate load resistor. you'll probally have to replace the transistor and the resistor.