Originally Posted by conpewter
Kick I don't want to steal your thread, but also wanted to ask if TIG is the best way to go for a beginning weldor? Looking to do stainless and some mild steel related to motorcycles and maybe my truck.
For small diameter tubing and making short welds, tig would be the process to use, even for a beginner.
Mig was invented for production, laying down weld very fast. When welding small diameter tube and pipe it just lays down too fast to manage and make nice looking welds.
And at low currents you're welding with a short circuiting arc that tends to be a little on the cold side making your welds look excessively convex, and tends to create a lot of spatter.
Globular transfer makes a better penetrating, smoother weld but is usually too hot for small diameter, thin walled tubing.
Spray transfer makes the nicest welds, with virtually no spatter, and excellent penetration, but requires even more current than globular transfer.
Spray transfer is suited for heavy weldments that require high amounts of weld deposited at a fast rate.
Don't get the wrong idea about what I'm saying. Mig does a great job at doing square tubing, but but tig is better suited on small rounds.
The reason is when welding round tubing your hand position is constantly changing as you progress around the tubing at the same time mig wire is constantly feeding out of the gun. You cannot change the rate at which the wire feeds while your welding. This also results in different weld profiles as your position changes while making the weld.
When tig welding you have total control over the rate at which you deposit metal, and your weld profile tends to remain the same as you progress.
The biggest obstacle for beginners is the coordination of working a foot control, torch, and filler metal all at the same time and making it all work together.