moonlight machine
Diamond
- Joined
- Nov 19, 2007
- Location
- marysville ohio
When I weld header tubes together I have always purge welded them. I have some caps made up with a hole in one for the purge hose and the other with a grid of .050 holes. I set the purge flow meter to 8 wait a minute reduce flow to 3 and weld. For no reason I got to thinking about what is going on inside the tube. Does the air and argon mix and eventually become all argon as more argon flows in and the excess flows out the vented cap or does it stay separate? Argon on bottom/ air on top? Air on bottom Argon on top? What say you all?