I agree with David to an extent. MIG is def. the most difficult process to set-up. Few people set machine correctly and have mastered fine trimming of parameters. However if you have someone to set the machine or one of the new funky machines that set themselves (well trim themselves for optimum transfer) it is by far the easiest process in terms of manual dexterity required. I have seen many a so called 'Coded' welder that cant trim welding parameters on a MIG set because it has always been done for them in terms of preset programs or via a welding engineer.
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