At first reading, it sounds like mig is the way to go, but I'd really suggest
that you use a quality machine. I've had many machines in my shop over the
years and use all methods still to this day (even gas and stick). Proper fit
up is essential but must be darn near perfect with tig. As mentioned, it can
be tough to tig in tight spaces or when welding parts in situ. To tig
correctly you also need to understand cup/lens/shielding/filler requirements.
A quality mig machine with an experienced operator can produce welds that rival
tig welds in quality and appearence and is much easier/faster.
That said, all critical work done on our race cars is ... tigged! We've four
tig machines (including an inverter type), all between 205-300 amps and love
them. However, our mig machines are the workhorses and are far more
productive, versatile and convenvient. If you've easy access to your work,
patience and the the ability to provide a perfect fit up tig is super.
The key to any process is quality of prep, understanding the method and using
quality equipment and consumables. If I had to choose only one general purpose
machine between mig and tig I'd go for a high quality mig without doubt.
Happy to add to the confusion, Charlie (welding daily for too many years)
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