Ok here are the photos..
MY RV 50 amp receptacle.... compare the range plug to the RV receptacle.
Range cord - welder pigtail.
Range cord is 2 hot wires, 1 neutral, 1 ground.
Welder plug is 2 hot wires, 1 neutral, no ground.
Hot wires 8 awg, neutral/ground 10 awg. This may not be heavy enough for certain RV applications.