“Yeah.”
Lou nodded slowly. “And the pipe is horizontal?” horizontal position in welding
“So the weld’s axis is horizontal,” Lou said. “Even though you’re welding on top, that’s not a flat position weld. That’s horizontal position—because the pipe’s centerline runs side to side. If you weld it like a flat plate, gravity’s going to pull your puddle down the side before you can say ‘undercut.’” “Yeah