Quote Originally Posted by biketrialsdave View Post
Just pulled it out the garage, its the one in the link below. Very cheap and cheerful. Only a 100A output.. What sort of thickness steel box section would be best to use? 3/4mm?

http://www.metals4u.co.uk/welding/we...sp?prd_id=3124
4mm will be better than 3mm but either will work. With 100A you'll be limited to 2.5mm rods which will be better suited to 3mm.