Hi All, My name is Mel and I am new to welding. I own a Starweld 190 Arc welder and i wish to build myself a motorcycle work bench from box section steel. My queries are: my Starweld has 48v and 70v; which one do I use for welding 3/4mm box section? what is the other one used for? and what would be the best rods to use for this project? Any advice would be much appreciated. Best regards Mel