Need help for my project
Whereas welding with a microwave is possible, the results will neither be uniform nor reliable unless a 'puddle' is the desired result. Microwaves lend themselves much more towards smelting and alloying of various metals.
Under normal conditions - that is, unless very specific conditions are developed deliberately - a microwave will not create X-rays as the energy levels are simply too low. But that is not to suggest that large amounts of metal in a microwave will not do serious damage to the device itself, or possibly send molten splatter far and wide. Put something solid between you and the unit when you are doing your experiments.
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