Before diving into specific positions, it is essential to understand the geometry used to define them. Welding positions are determined by two primary variables:
You must keep a very tight arc and a small weld puddle so the surface tension holds the metal in place before it can drip. Understanding the Codes position of welding
This is widely considered the most difficult welding position. The weld is performed from the underside of a joint. Before diving into specific positions, it is essential
| If you are welding... | Position | Tips | | :--- | :--- | :--- | | A trailer hitch on the floor | Flat (1F) | Use maximum amperage. Run hot for deep fusion. | | A handrail post to a baseplate | Horizontal (2F) | Aim 45° into the corner, but tilt 15° up. | | A vertical support beam in a building | Vertical (3F uphill) | Weave a triangle. Count "1-2" on the left, "1-2" on the right. | | A car exhaust under a lift | Overhead (4F) | Drop to 75% of flat amperage. Use short arc length. | | A pipeline in a ditch (fixed) | 5G (Pipe) | Weld the top (flat) first, then the bottom (overhead), then the sides (vertical). | The weld is performed from the underside of a joint
Use a "weaving" motion to help the metal freeze against the pull of gravity. 4. Overhead Position (4F / 4G)
Pipe adds a curve and 360° of varying angles. These are the certification standards.