1G, 2G, 3G, 4G Welding Positions Explained: Plate Test Guide
1G through 4G plate welding positions explained. Technique adjustments for flat, horizontal, vertical, and overhead. Test plate dimensions and certification scope.
Welding Positions Explained
Welding positions explained: 1G through 6G for plate and pipe. Technique adjustments, amperage changes, and pass sequence for flat, horizontal, vertical, and overhead positions.
Welding position determines how gravity affects the molten puddle, and gravity is either your friend or your enemy depending on technique. Flat position lets the puddle sit in the joint. Overhead position tries to drip it on your neck. Every position change requires adjustments to amperage, travel speed, electrode angle, and manipulation pattern.
The AWS position system uses numbers for orientation and letters for joint type. 1G/1F is flat. 2G/2F is horizontal. 3G/3F is vertical. 4G/4F is overhead. The “G” designates groove welds (butt joints), and “F” designates fillet welds (tee and lap joints). Pipe welding adds 5G (pipe horizontal, welder moves around it) and 6G (pipe at 45 degrees, fixed position).
Flat position (1G/1F) is where everyone starts. Gravity holds the puddle in place, and you can use higher heat and faster travel speed. This is the position for maximum deposition rate in production welding. Most training programs keep students on flat work until bead consistency and width control are solid.
Horizontal position (2G/2F) introduces the first gravity challenge. The puddle wants to sag to the bottom toe. Angle the electrode or gun slightly upward (5-10 degrees), reduce amperage by about 10%, and watch the bottom toe for undercut. On fillet welds, the common mistake is building up the top leg while starving the bottom.
Vertical position (3G/3F) splits into vertical up and vertical down. Vertical up is the structural standard because it provides full penetration and a solid tie-in. Use a slight weave or triangle pattern, pausing at each toe to let the puddle fill. Vertical down moves faster but produces shallower penetration, useful only on thin material or non-structural work.
Overhead (4G/4F) demands the lowest heat settings and tightest arc length. Keep the puddle small, move steadily, and wear proper protection because sparks and spatter fall directly on you. Short stringer beads work better than weaving in overhead.
The guides below cover technique details, amperage adjustments, and practice drills for each position.