Reddit reviews Kohree 50 Amp to 30 Amp RV Plug Adapter Heavy Duty Dogbone Electrical Power Adapter with Grip Handle, 50M/30F 125V/3750W 18
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【Heavy duty Electrical power adapter】-50AMP (TT-30P) male to 30AMP (14-50R) female adapter for all RVs running 50 amps, perfect power conversion for those RV Parks only have 50 amp service,maximum loading at 125V/3750-Watt.【Well constructed】Adapter cord is constructed in 100% copper and coated with a heavy duty flame retardant, heat resistant PVC sleeve well protect it from outdoor elements, wear and tear.【Grip Handle Design】-Both ends of power adapter are designed with ergonomic Grip handles, make removal from a plug or outlet much easier, effectively saving physical strength.【Longer Adapter, More Flexible】The whole adapter is 18’’,more flexible to use.The power cord can be 180 degree bent from male end to female end.【Satisfactory warranty】Kohree stands behind all of its products 100%. if you aren't happy with your light for ANY reason, feel free to contact us for help.
You can connect small devices to large circuits but you can't connect large devices to small circuits. If your welder was 50a and your garage circuits were 30a, you'd have to run new circuits.
A quick Amazon search yields a bunch of results for premade adapters.
https://www.amazon.com/Kohree-50-30-Amp-Plug-Adapter/dp/B07G55Y53V/ref=mp_s_a_1_1_sspa?keywords=50+amp+to+30+amp+adapter&qid=1564506827&s=gateway&sr=8-1-spons&psc=1
You could also buy all the necessary components at Home Depot if you're in a hurry. You'll need some basic electrical skills. If you go this route, you'll need to use at least #10 wire. If it were me, I'd use #8 extension cord type wire, I think it's called SO cable.
Good luck!!