I have some welding to do on 3mm mild steel square tubing. It's not a structural weld, but it does support some fairly hefty steel mudguards. I'll be using a Clark 165tn turbo with 2.4mm 6013 rods. But not sure on what amperage to start with as a rough setting, I haven't welded in years and never had any formal training, so any advice is helpful If the pictures show, I have put up a quick snap of the bit I'll be welding. It's a repair job on a fracture due to vibration.