Right looks like i might go down to my steel stockist and get some 1.6mm steel bar and have a practise. Someone on the mig welding forum has shown me a pic of where he's welded 1.6mm tube together using the 2.5mm rods im using so looks like i might just go down that route.
Im still curious as to why ERW is better though, what is it other than the corner profiles that makes it so much better.
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