A #10 copper conductor with an insulation factor of 75 or 90 degrees C are both rated at 30 amps.
A #8 aluminium wire with an insulation factor of 90 degrees C is rated at 45 amps.
Technically no. In the USA the NFPA electrical code requires a separate circuit for each large appliance receptacle- there are a few exceptions (such as a heater and AC on same circuit) - I don't think the welder is one of the exceptions. In practice, as long as only one receptacle is used at a time, it will work fine Make sure that the wire size is correct for the current (amp) draw. This is taken off of the welder nameplate. Size the breaker to protect the wire size. If more that one welder gets plugged in the breaker will trip.
The size breaker you use is determined by the size wire used in the circuit. If you use AWG #12/2 wire then use a 20 amp breaker. If you use AWG # 14/2 then use a 15 amp breaker.
Normally it is a 20 amp using AWG 12/2 gauge wire. But it really depends on what size wire is on that circuit. If it is white AWG 14 gauge then use a 15 amp breaker. If it is yellow AWG 12 gauge then use a 20 amp breaker.
Depends on the size of the circuit which you did not list.
A #8 aluminium wire with an insulation factor of 90 degrees C is rated at 45 amps.
The recommended wire size for a 30 amp circuit is typically 10 gauge wire.
The recommended wire size for a 60 amp circuit is typically 6-gauge wire.
The appropriate wire size for a 20 amp circuit is typically 12-gauge wire.
For a 25 amp circuit, the appropriate wire size is typically 10 gauge wire.
The appropriate wire size for a 30 amp circuit is typically 10 gauge wire.
The appropriate wire size for a 50 amp circuit is typically 6-gauge wire.
The appropriate wire size for a 60 amp circuit is typically 6-gauge wire.
The recommended wire size for a 20 amp circuit is typically 12-gauge wire.
The recommended wire size for a 35 amp circuit is typically 10 gauge wire.
The recommended wire size for a 50 amp circuit is typically 6-gauge wire.
The recommended wire size for a 220v 20 amp circuit is typically 12-gauge wire.