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Use armoured flex, armoured cable (or SWA - Steel wire armoured as it is known) - will be too stiff and the connections at plug and welder will become damaged. Armoured flex is like a normal flex but has fine wire braiding around inside a plastic sleeve (and needs connecting to earth) - you will be as safe as houses with that. Go to City Electrical Factors or somewhere similar who will get it for you. Just got some real heavy stuff recently, and it aint that expensive!