220VAC generator & 220VAC welder

Are you saying the welder is rated at 50 amps input from the supply or

50 amps output to the work?

I do not know the answer to that question. I assume the plug is capable of

50 amps but also the welder has a huge duty cycle slider I can control.

Obviously I'm not a welder so it's likely I can experiment to keep the duty cycle such that the main panel 30 amp circuit breaker won't blow.

I would have expected a welder described as "XXX Amps" to give XXX Amps on the output, but 50 amps seems a ridiculously low output for a welder that could be used on anything bigger than jewellery.

The duty cycle would have to be pulsed at a rate which is faster than the delay time of the circuit breaker. This might be possible if the pulsing is electronic but a human welder would find it very difficult to keep starting and stopping. With a 'stick' welder (coated rods) this would result in a totally unsatisfactory weld but with MIG or TIG it might be possible to make something with thin sheet that stays together.

On Thu, 20 Feb 2025 08:40:42 +0000, Liz Tuddenham snipped-for-privacy@poppyrecords.invalid.invalid> wrote

It's only 30 amps according to the Amazon listing but I wonder if this adapter does do almost exactly what the OP asks for it to do?

Can he plug the welder male (NEMA 6-50P) into the female (NEMA 6-50R) of the adapter, and then the male (NEMA L14-30P) of the adapter into the female (NEMA L14-30R) of the generator?

I see two potential issues that I'm not the one to explain.

1. There are 4 wires on one side but only 3 wires on the other side
2. There is a potential for 50 amps on one side but only 30 on the other

The amperage can probably be controlled. But can the wires be controlled? I have no idea. It seems dangerous to me. What's the other wire doing?

Since one side is four wires and the other side is only 3 wires, what do you think they did with the fourth wire? Connect it to ground?

I don't know how it's wired internally though but it's UL listed. I guess that means it's perfectly safe (it's ETL listed also).

[Welder Adapter Cord] NEMA L14-30P male plug to NEMA 6-50R female plug, Supports up to 30 amps, 125/250 volts, 7500 watts max [Male Plug] 4 Prong 30 Amp 125/250 Volts, NEMA L14-30P male plug for L14-30 generator power receptacle [Female Receptacle] NEMA 6-50R, 50 Amp, 3 Prong Female Connector with handle. Suitable for welder , plasma cutters, dryers, electric vehicles and so on, with a NEMA 6-50 plug to receive power [Widely Application]This 30 Amp welder adapter cord helps you connect welder from a portable generator, it is widely use for dryers, recreational vehicles, electric vehicles, dishwashers and so on [Safety and Durability] 10/4 AWG, Pure copper wiring coated with a Heavy Duty flame retardant, heat resistant, UV resistant PVC , Suitable for various harsh environments, ETL-listed