This is the gold standard for plate. One test — two positions — and you're qualified for everything. All groove positions, all fillet positions, unlimited thickness. If your welders are going to work structural steel, this is where you want them.
Running a 3G and a 4G together in a single session qualifies the welder for every groove weld position (1G through 4G) and every fillet position (1F through 4F) on plate — and with a 1" test plate, you get unlimited thickness range. That's the full package.
The alternative is running individual position tests as you need them, which costs more in the long run and leaves gaps. Most structural steel contractors and fabricators want their welders carrying a 3G+4G for exactly this reason: maximum versatility, minimum re-testing.
| Category | Positions Covered |
|---|---|
| Groove Welds (CJP) | 1G, 2G, 3G, 4G — all positions |
| Groove Welds (PJP) | All positions |
| Fillet Welds | 1F, 2F, 3F, 4F — all positions |
| Thickness (1" test plate) | 1/8" to unlimited |
The welder runs two separate test plates — one in vertical uphill (3G) and one overhead (4G). Both use the standard 45° CJP groove with ¼" backing. Both plates must pass visual and soundness testing. If one fails, only the failed position needs to be retested.
Both plates are inspected by our CWI. Visual first, then bend tests or RT depending on the process. GMAW short-circuit still requires bends, not RT. Both plates passing = WPQ issued for all positions.
Run the 3G plate with controlled vertical-uphill progression. Take your time on the root — that's where most 3G failures happen. Then the 4G: shorter arc, lower amps, faster travel. Both are skill tests. Practice before you ship.
If your welder hasn't done overhead recently, do some practice runs first. The test isn't the place to find out whether overhead works for them.
Get a Quote — 3G/4G