Position In Welding Updated — Horizontal

“Flat, of course,” Marco said, pointing to the top of the pipe. “The bracket goes here.”

Lou nodded slowly. “And the pipe is horizontal?” horizontal position in welding

The lesson Marco never forgot: Welding on top of a horizontal pipe is horizontal position welding (per AWS: 2F for fillet, 2G for groove)—and it requires deliberate technique to manage gravity’s sideways pull. Ignore that, and your weld will sag, undercut, or fail when it matters most. Takeaway for your own work: When you see a horizontal joint (the weld’s length runs left-to-right), always remember—gravity is not your friend. Aim slightly upward, keep a tight arc, and watch the puddle’s lower edge like a hawk. That small adjustment separates a pretty weld from a safe weld. “Flat, of course,” Marco said, pointing to the

Here’s a useful story that illustrates the importance of the in welding, specifically for safety and quality. Title: The Pipe that Almost Rolled Ignore that, and your weld will sag, undercut,

Marco ground out his mess and tried again. This time, he tilted the electrode 5–10 degrees upward, kept a tight arc, and moved steadily. He watched the puddle solidify like a tiny shelf, each ripple locking in place before the next. The weld was flat on top, slightly convex on the bottom face, and fully fused.

“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.’”

Within three inches, his molten puddle sagged. The top bead looked fine, but the toe on the lower side was jagged—metal had dripped downward before solidifying. He tried speeding up, but that just created cold lap. Frustrated, he chipped off the slag and saw the truth: a weak, uneven weld with undercut along the bottom edge.