Welding position affects everything — the difficulty of the weld, the parameters you use, and what your qualification covers. A 6G test qualifies all groove positions. A 1G test only qualifies flat. Understanding these relationships is essential for managing welder qualifications efficiently.
What Are the Groove Weld Positions for Plate?
Plate groove positions run from 1G (flat) to 4G (overhead). Each position changes how gravity affects the weld puddle, increasing difficulty as you move from flat to overhead.
| Position | Name | Description | Difficulty |
|---|---|---|---|
| 1G | Flat | Plate is horizontal, you weld on top. Gravity works with you. | Easiest |
| 2G | Horizontal | Plate is vertical, weld runs horizontally. Gravity pulls the puddle down. | Moderate |
| 3G | Vertical | Plate is vertical, weld runs up or down (vertical-up or vertical-down). | Hard |
| 4G | Overhead | Plate is horizontal above you, you weld looking up. | Hardest (plate) |
These positions apply to any plate groove weld regardless of process. Your WPS must specify which positions it covers, and the welder must be qualified in each position used in production.
What Are the Groove Weld Positions for Pipe?
Pipe adds 5G and 6G to the mix. The key difference from plate: pipe positions often combine multiple orientations in a single joint since you weld around the circumference.
| Position | Name | Description | Difficulty |
|---|---|---|---|
| 1G | Flat Rotated | Pipe is horizontal and rotated as you weld. Always welding in flat position. | Easiest |
| 2G | Horizontal | Pipe is vertical, you weld around it horizontally. | Moderate |
| 5G | Horizontal Fixed | Pipe is horizontal and fixed. You weld all the way around — top, sides, bottom. | Hard |
| 6G | 45-Degree Fixed | Pipe is at a 45-degree angle and fixed. Combines all positions in one joint. | Hardest |
| 6GR | 6G Restricted | Same as 6G but with a restriction ring that blocks access. | Ultimate test |
The 6G test is the gold standard because it forces the welder through flat, horizontal, vertical, and overhead in a single joint. Passing a 6G qualifies all other groove positions — which is why many shops use it as their default performance qualification test.
What Are the Fillet Weld Positions?
Fillet positions use an "F" suffix instead of "G." They follow the same flat-to-overhead progression as groove positions but apply to T-joints, lap joints, and corner joints rather than butt joints.
| Position | Name | Description |
|---|---|---|
| 1F | Flat fillet | Joint tilted 45 degrees, weld deposited from above |
| 2F | Horizontal fillet | One plate horizontal, one vertical — weld on the horizontal plate |
| 3F | Vertical fillet | Both plates vertical, weld runs vertically up or down |
| 4F | Overhead fillet | Joint above you, weld deposited upward |
| 5F | Pipe fillet (horizontal fixed) | Pipe horizontal and fixed, fillet weld around the circumference |
Which Test Position Qualifies Which Production Positions?
Testing in a harder position qualifies you for easier positions. A single 6G test qualifies all groove positions and all fillet positions. This is the most critical relationship for managing welder qualifications.
| Test Position | Groove Positions Qualified | Fillet Positions Qualified |
|---|---|---|
| 1G | 1G only | 1F |
| 2G | 1G, 2G | 1F, 2F |
| 3G | 1G, 3G | 1F, 3F |
| 4G | 1G, 4G | 1F, 4F |
| 3G + 4G | 1G, 2G, 3G, 4G (all plate) | 1F, 2F, 3F, 4F (all plate) |
| 5G | 1G, 2G, 3G, 4G, 5G | 1F, 2F, 3F, 4F, 5F |
| 6G | All groove positions | All fillet positions |
| 6GR | All groove positions | All fillet positions |
Key rule: Groove qualifies fillet, but fillet does NOT qualify groove. You cannot weld groove joints based on a fillet weld test. This distinction matters when planning your WPS qualification strategy — one well-chosen groove test can eliminate the need for separate fillet qualifications. For example, a single 6G groove test qualifies the welder for every production position and joint type, saving the cost and time of multiple separate tests.
Why Does Vertical Progression Matter?
Whether you weld vertical-up or vertical-down is an essential variable. Testing vertical-up qualifies vertical-up only. Testing vertical-down qualifies vertical-down only.
Under AWS D1.1, vertical-up may qualify vertical-down but not the reverse — check your specific code edition. This matters especially for GMAW short-circuit transfer, which D1.1 limits to vertical-down on material 3/16" and thinner per Clause 5.22. If your welder's continuity lapses on a vertical process, they lose that progression qualification and must retest. Shops running both vertical-up and vertical-down need to track each progression separately during audits. ASME IX (QW-405.2) treats uphill and downhill as supplementary essential variables, meaning a change in progression direction requires a new PQR if impact testing is required.
Frequently Asked Questions
Does a 6G qualification cover all welding positions?
Yes. A 6G pipe test qualifies a welder for all groove positions — 1G, 2G, 3G, 4G, and 5G — because the 45-degree fixed pipe combines flat, horizontal, vertical, and overhead welding in a single joint. It also qualifies fillet welds in all positions. This is why 6G is the standard qualification test for most shops.
Does a groove weld qualification cover fillet welds?
Yes. Under both ASME IX and AWS D1.1, a groove weld test in a given position qualifies the welder for fillet welds in the same and lower positions. However, a fillet weld test does NOT qualify the welder for groove welds. Groove joints require their own groove weld performance test.
What is the difference between vertical-up and vertical-down qualification?
Vertical progression is an essential variable. Testing vertical-up qualifies you for vertical-up only. Testing vertical-down qualifies vertical-down only. Under AWS D1.1, uphill may qualify downhill but not the reverse. GMAW short-circuit vertical-down is limited to material 3/16 inch and thinner per D1.1.
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