1) Does the metal need to be preheated? If so how - with a propane torch or something?
2) Do i use 4043 or 5356 aluminum. Whats the real differences with the two. Can i mix and match the two. If i have a spool of 5356, can it be used on a piece of 4043?
3) What does push/pull mean. I read alot about it but cant find out what it means. Is the push/pull gun the spoolgun?
4) And finally when welding aluminum, do i go from left to right, or right to left? Do i keep the arc in the puddle or away from it, thanks.