Broco portable MIG welder - Designing a portable, high-end, MIG welding system from the ground-up is a daunting task task. The solution; 12V automotive battery power, power/feed controls as in production MIG welders. I was brought into the project at a late stage. The project was at a standstill as a mechanism to achieve a clean weld had been elusive. Images represent my componentry and working test models..