when i started my trade in 1963 first welding taught was gas welding , mig was,nt around yet,stick , sub arc fuse, so oxy/acet was used widely, i not seen it used in 30 years ,some brazing and silver soldering, to use oxy on airframes now is very old school, tig is widely used and some mig, i weld my chrome ally parts with ss arc rods, easy and very strong, some post heat used , look at most lsa aircraft from o/s and they tig most components very fine welding (my eyes not good enough for fine work) and very thin walled, rivets are a quick and easy way to assemble airframes thats the way i am useing on my airframe ,only welding is in noseweheel components,undercarraige and safety cage, for the homebuilt guys who dont weld rivets are the way to go