All of the pipes I have butt welded for my turbo piping, I have used JC whitney, heartthrob manderel bent pipes in 2.5", butt welded w/ 60/13 stick, using a 110 arc welder, on 100 amp. welds get good penetration, and look decent and fairly uniform, but when I test them w/ water, they always seem to seep out water, like the welds just get wet. what can I do to prevent this? it's going to be under 8 PSI and I'd rather not have preassure drop.