i was allways under the impression you needed tig to weld alli?am i wrong?hmmmm i will have a go later. as for gas nip down to your local pub and ask them if you can buy a c02 gas bottle off them as they get it for pennys, i paid £20 for a full size c02 bottle, size is 120cm tall x 23 cm diameter, i have had that bottle for well over a year.