Mig is the easiest, fastest and most versatile of all the welding methods, especially for a beginner. Tig is more suited to bench welding. It is a process that calls for being in a comfortable and steady position........that happens rarely under a car on your back or knees. Tig also takes many, many more hours of practise. I know guys who Mig and Stick for years and still can't Tig.
If you can learn Tig as well though, you can hammer weld and shape the panels somewhat as you go........it is HOT!........like gas. Can't do that with Mig. Colder process and harder weld bead generally.
In comparison to what you guys do with Cits.......I don't think you have much to fear with Mig Welding.
It is not common for welding to break or give way really. I remember when building a Seven from scratch many years ago. The wishbones were hand made and some guys posted up picks of accidents where wishbones were bent like hairpins,
Some of the welds were quite rough to say the least, but they never gave way. Needless to say I still root and cap welded mine ,but it was intriguing. A good tack weld can hold a ton.
On old cars it is cutting to sound metal and cleaning it to bright that is key. You want enough power to transfer through the metal showing a facsimile of your weld. but without burning holes. That is your penetration and it is done with the settings of your amps and suitable wire speed and torch movement.
I am pure amateur and I know you guys are gonna love your welding and tin bashing.
