This may be a bit long winded but to get my point across it may be necessary Prior to getting our MIG welder installed where I work, I would stick weld this dummy end bobbin into the 4” tube with a wall thickness of 1.5mm approx. Which wasn’t a problem. The bobbin has to be set back from the opening by 5-10mm for clearance reasons. Is the any tips tricks or just any advice I can get to make my MIG welds in this application more consistent. Just for note if it makes visualising the application easier this is a bobbin for a tube motor in the roller shutter industry.