A welder can run vertical beads on plate for years, but without a documented AWS D1.1 3G SMAW test record, contractors hiring for welding jobs in structural construction and manufacturing have no proof the work meets code. The gap is not skill; it is verification.
Structural steel continues to demand certified welders who can pass visual inspection and guided bend tests, not just make a weld that looks acceptable. Passing the 3G vertical groove test is the first half of the AWS D1.1 3G/4G combination qualification, covering flat, horizontal, and vertical positions. For many contractors, that test record is the difference between being dispatched and being sent home.
What Is the 3G SMAW Welding Certification?
What exactly is a 3G SMAW welding certification, and what does it qualify you to weld? In short, it is a practical test that proves you can deposit sound welds in the vertical groove position on plate using the shielded metal arc welding process, commonly called stick welding.
The 3G Position, Defined
In AWS D1.1 structural welding terms, "3G" refers to a groove weld made in the vertical position. The plate stands upright, and you weld from the bottom upward or the top downward, depending on the procedure. For certification tests, vertical-up is nearly always required because it produces deeper penetration and better root fusion than vertical-down on thick structural plate. The "G" stands for groove, as opposed to fillet, so you are welding between two beveled plate edges, not a lap or T-joint.
Why Stick Welding for Structural Certification?
SMAW is widely used for structural certification because it is field-portable, forgiving of wind and rust, and accepted across steel construction, pipe, and repair work. Unlike MIG or TIG, stick welding does not need an external shielding gas cylinder, which makes it the default process on job sites, bridges, and industrial maintenance crews. Passing a 3G SMAW test shows an employer that you can manage electrode angle, arc length, and travel speed in a position where gravity constantly tries to pull molten metal out of the joint.
What the 3G Test Covers
A 3G qualification on plate typically covers the flat, horizontal, and vertical groove positions. Under AWS D1.1, the positions qualified by a 3G test include:
- Flat groove welds: 1G position.
- Horizontal groove welds: 2G position.
- Vertical groove welds: 3G position.
It does not qualify you for overhead groove welding, which is a separate 4G welding certification test. That is why many welders take the 3G and 4G combination test when they want full plate coverage.
Why Career-Changers Pursue This Credential
For someone entering the trade, the 3G SMAW welder certification is a portable, proof-of-skill credential. It travels with you from employer to employer because it is tied to a national code, not a company procedure. Many structural and shipyard employers list a 3G SMAW qualification as a minimum hiring requirement, and holding it can lead to better-paying field work, shutdowns, and maintenance roles. Even if the test feels intimidating at first, it is a manageable first structural certification and a concrete way to show you can weld in a position that appears on almost every steel structure.
AWS D1.1 3G Test Specifications and Coupon Preparation
The 3G SMAW certification test follows AWS D1.1/D1.1M:2025-AMD1. The table lists the primary plate, backing, root opening, tacking, and temperature requirements for the vertical plate test. Bevel angle is not included in the available reference data, so confirm it against the governing welding procedure specification before cutting and fitting.
| Parameter | Requirement |
|---|---|
| Governing code | AWS D1.1/D1.1M:2025-AMD1 |
| Test plate thickness | 3/8 in (10 mm) |
| Backing bar thickness | Minimum 1/4 in (6 mm) to maximum 3/8 in (10 mm) |
| Root opening with backing | 1/4 in; set using two 1/8 in electrodes |
| Tacking | Tack from the back and center of the plate after setting the root opening |
| Minimum preheat and interpass temperature for 3/8 in plate | 32°F (0°C); if base metal is below 32°F, preheat to at least 70°F (20°C) |
SMAW Machine Settings and Electrode Selection for 3G
Choosing the right electrode and amperage keeps the 3G vertical-up test controllable. E6010 is a deep-penetrating cellulose electrode used for the root pass on DC electrode positive (DCEP), while E7018 is a low-hydrogen electrode used for fill and cap passes on AC or DCEP. In vertical-up, set amperage about 10 to 15 percent below flat position settings to avoid undercut and weld metal dripping.
| Electrode | Pass Type | Polarity | Amperage Range |
|---|---|---|---|
| E6010 1/8 in. | 3G vertical-up root | DCEP (DC electrode positive) | 75-100 A |
| E6010 3/32 in. | 3G vertical-up root | DCEP (DC electrode positive) | 45-70 A |
| E7018 1/8 in. | 3G vertical-up fill | AC or DCEP | 110-130 A |
| E7018 3/32 in. | 3G vertical-up cap | AC or DCEP | 70-95 A |
Step-By-Step Welding Technique: Root, Fill, and Cap Passes
With your coupon beveled, tacked, and clamped in the vertical position, the actual welding breaks into three phases. Each pass has its own electrode, technique, and inspection checkpoint. Rush any one of them and the bend test will find your mistake.
Root Pass with E6010
Run the root with a 1/8 in E6010 on DCEP. This fast-freeze electrode digs in and gives you the penetration the code wants at the joint root. Establish your arc at the bottom of the groove and work vertical-up, keeping a tight arc length (nearly touching the work). A whip-and-pause or slight upward drag motion helps the puddle keep pace without drooping.
Watch the keyhole. A small, consistent keyhole tells you the root is fusing to both bevel faces and the backing bar. If it grows too large, you are burning through; speed up slightly. If it closes, you have lost penetration; pause a beat longer at the leading edge. Hold a steady travel speed rather than chasing the puddle. Chip and wire-brush the root completely before moving on.
Fill Passes with E7018
Switch to 1/8 in E7018 for the fill, depending on your machine and comfort. This low-hydrogen rod runs smoother and lays down more metal per pass. You can run tight stringers or a controlled side-to-side weave; stringers give beginners more control and reduce the risk of trapping slag in the corners.
Interpass cleaning is where most tests are quietly lost. Between every fill pass, chip the slag and wire-brush the bead until it shines. Slag left in a toe or crater becomes a slag inclusion that shows up on the bend coupon during Destructive Weld Testing. Pause slightly at each side of the weave to tie into the groove walls and avoid cold lap. Keep the joint filled evenly so the cap has a flat foundation to sit on.
Cap Pass and Puddle Control
Cap the joint with 3/32 in E7018 using proven Cap Welding Techniques. Set a weave width that covers the groove and ties in about 1/16 in past each bevel edge, then hold that width consistently the whole way up. A wandering weave produces a ropey, uneven cap that fails on appearance before it ever reaches the bend fixture.
The two cap-killers are undercut and lack of fusion at the toes. Pause at each side of the weave long enough to fill the toe, then move across the face quickly so you do not pile up the center. Aim for a slightly convex weld face, not flat and not piled high. Reinforcement that sits proud of the base metal by roughly 1/16 in is safe; excess crown gets ground off and can dig into the plate.
Throughout all three phases, keep the puddle under control. Read it constantly, adjust travel speed before the bead tells on you, and never trade a clean pass for a fast one. A steady hand and disciplined cleaning beat raw speed every time on a 3G test.
How a 3G SMAW Weld Is Built From Root to Cap
The 3G vertical-up test moves from root to fill to cap, and each pass has a distinct job. Keep the arc moving uphill and control the weave so slag rolls behind the puddle instead of getting trapped.
Post-Weld Inspection and Guided Bend Testing
After welding, the 3G coupon is inspected visually and then cut for guided bend testing. Visual acceptance criteria catch surface discontinuities before bending, and bend specimens reveal deeper defects under strain. Use these AWS D1.1 thresholds as the pass/fail reference.
| Discontinuity / Check | Acceptance Criteria | Auto-Fail? |
|---|---|---|
| Visual: Undercut | ≤ 1/32 in (0.8 mm) for welds in primary members transverse to applied stress; up to 1/16 in (1.6 mm) in other locations | Fails when undercut exceeds the applicable depth limit |
| Visual: Porosity | For fillet welds, no visible piping porosity. For groove welds in tension, the sum of visible piping-porosity diameters is ≤ 3/8 in in any 12 in length | Fails when porosity limits are exceeded |
| Visual: Weld reinforcement and profile | Convexity, reinforcement, and profile are governed by AWS D1.1 Figure 5.4 acceptable and unacceptable weld profiles; the source does not state a numerical reinforcement limit | Fails when the weld profile is unacceptable per Figure 5.4 |
| Guided bend: Open discontinuities on convex side | No single open discontinuity may exceed 3/16 in (5 mm) in any direction on the convex side of the bent specimen; includes surface-opening porosity, cracks, lack of fusion, slag tears, and other open discontinuities | Fails when a single open discontinuity exceeds 3/16 in (5 mm) |
| Guided bend: Corner cracks | Maximum corner crack is 1/4 in; if the corner crack results from visible slag inclusion or another fusion-type discontinuity, the 1/8 in maximum applies. A corner crack exceeding 1/4 in with no evidence of slag inclusion or another fusion-type discontinuity is disregarded, and a replacement specimen from the original weldment is tested | Fails when corner crack exceeds 1/4 in, or exceeds 1/8 in if caused by visible slag inclusion or fusion-type discontinuity |
| Specimen preparation and side-bend orientation | Standard guided-bend specimens are 1-3/8 in wide; length is sufficient to seat in the die with the weld centered. Side-bend specimens are 3/8 in thick and cut transverse to the weld. Machine-cut or grind specimens to remove heat-affected surface; dress flame-cut edges to bright metal | N/A (preparation requirement) |
Vertical-Up vs Vertical-Down Welding: What the Code Says
New welders often ask why the test proctor insists on uphill when they have seen production crews run beads downhill all day. The answer is that AWS D1.1 treats direction of vertical progression as a qualification variable, not a matter of preference.1 Your 3G test paper says what it says, and it does not quietly cover the opposite direction.
Under AWS D1.1, Direction Is a Separate Qualification
D1.1 handles uphill and downhill as distinct essential variables for both the welding procedure (WPS/PQR) and for welder performance qualification.1 A single plate test does not buy you both directions.2 Qualify 3G uphill and you are certified for 3G uphill; qualify 3G downhill and your range covers downhill only. If the shop wants you running the other direction on code work, that generally requires separate qualification support.2
For vertical position welding, D1.1 sets upward progression as the default for all passes. The one narrow allowance in the code is repairing undercut vertically downward, and only when preheat requirements are satisfied.3 That is a repair provision, not blanket permission to run downhill production groove welds.
Where Vertical-Down Is Actually Permitted
Downhill travel does appear in structural work, but the applications are limited:
- Fillet welds and flare groove welds: the recurring exception where downhill progression shows up in practice.4
- MIG welding techniques (GMAW short-circuit transfer): commonly restricted to thinner material, with guidance citing roughly 3/16 in and under.4
- CJP groove welds: the prequalified route requires uphill. Running a complete joint penetration groove weld downhill means giving up prequalified status and supporting the procedure with a PQR instead.5
That last point matters for anyone reading a shop WPS. Downhill on a CJP groove is not forbidden outright, but it has to be qualified by test rather than assumed.
Other Codes, Especially Pipeline Work
Pipe welding is where the culture flips. API 1104 is generally more permissive of vertical-down progression than AWS D1.1, and downhill stringers with cellulosic electrodes are standard practice on cross-country line work.6 The qualification path and process still govern what you are allowed to run, so the difference is one of emphasis rather than a free pass.
What to Verify Before You Strike an Arc
Check the edition of the code in force on your job, then read the actual WPS and your own welder qualification record. Under D1.1 the safe assumption in 2026 is that uphill and downhill are separate certifications, and downhill is the exception.2 If someone tells you a 3G uphill ticket covers downhill production welds, ask to see the paperwork that says so.
3G Certification Scope, Limits, and Retest Rules
A passed 3G plate test under the AWS D1.1 Structural Welding Code , Steel qualifies a welder for flat, horizontal, and vertical groove welds (1G, 2G, 3G) plus flat, horizontal, and vertical fillet positions (1F, 2F, 3F).1 It does not extend to overhead work: 4G and 4F remain outside the scope of a 3G-only qualification. That's exactly why 3G is treated as the first half of the 3G/4G combo covered in the companion guide to the 4G overhead certification: pair the two and you cover every plate position AWS D1.1 recognizes.
How Long the Qualification Stays Current
A Welder Performance Qualification Record isn't a lifetime credential. AWS D1.1 applies a six-month continuity rule: if a welder goes six consecutive months without using SMAW in production or maintenance welding, that process qualification lapses.2 The rule is process-specific, so a lapse in SMAW doesn't touch a separately qualified process like flux cored arc welding or MIG welding. Some employers track this more tightly than the code requires, logging weld dates per welder per process to flag an approaching lapse before it happens. Others simply rely on the six-month rule as written. Either way, an expired qualification means requalification testing before that welder can be assigned SMAW work again.
When Retesting Is Required
Retesting isn't limited to expired certifications. A failed 3G test requires requalification on the same coupon type before another attempt is credited, and there's no code-mandated cooling-off period, though many shops and test facilities impose their own wait time to allow for additional practice. Requalification can also be demanded at any time, lapse or no lapse, if an employer or engineer finds a pattern of defective welds in production.1 That's the code protecting quality control, not punishing the welder.
Why Employer Rules Can Be Stricter
AWS D1.1 sets the floor, not the ceiling. A 3G qualification earned at a training school or test facility establishes what the code allows, but an employer can narrow that scope further, restricting a welder to specific joint types, material thicknesses, or shop-approved procedures. Many shops also require site-specific retesting even for a welder who already holds a valid, current 3G credential, simply because their welding procedure specification, base material, or joint configuration differs from what the original test covered. Before assuming a 3G ticket travels freely between employers, verify against the current AWS D1.1 edition in use and ask directly what the shop's qualification range requires.
Common Questions About 3G SMAW Certification
Here are answers to the questions welders ask most often when preparing for a 3G SMAW test. Always confirm the specific code edition and employer WPS details, because qualification requirements vary by test administrator.
- What exact plate dimensions and bevel geometry apply to a particular 3G test?
- There is no universal set of numbers. The plate thickness, bevel angle, root face, and root opening are set by the governing code edition and the WPS you test under; a pipe test follows a different prep, as shown in How to Bevel Pipe and Setup a 6G Weld Test. For an AWS D1.1 3G SMAW test, the coupon is vertical plate, but exact dimensions must be taken from the procedure specification before cutting and tacking.1
- Does passing 3G qualify the welder for 3F as well as 1G, 2G, and 3G?
- Qualification range is controlled by AWS D1.1 Table 4.1 and your employer's WPS.2 A 3G vertical groove test generally qualifies a welder for flat and horizontal groove positions (1G and 2G) plus the 3G position itself. For fillet welds, flat and horizontal fillets (1F and 2F) are commonly covered. A 3G groove test includes the vertical fillet position (3F); confirm against the code table and your WPS before relying on it.
- What visual discontinuities cause an automatic failure?
- Cracks, incomplete fusion, incomplete joint penetration, and undercut beyond code limits are automatic visual rejections. Porosity, slag inclusions, overlap, and excessive reinforcement can also fail the visual inspection if they exceed the acceptance criteria in AWS D1.1 or the applicable WPS.
- When is vertical-down welding permitted under AWS D1.1 or another applicable code?
- For a 3G structural plate groove test under AWS D1.1, vertical-down is generally not permitted unless a qualified WPS specifically authorizes it. Some other codes allow vertical-down for thin sheet metal, root passes on pipe, or certain fillet welds, but do not assume this for a 3G structural plate certification.
- How long must I wait to retake a failed 3G SMAW test?
- AWS D1.1 and many employer-administered 3G SMAW tests do not publish a universal waiting period. One program, Canada's 2026 Red Seal Welder Exam, requires a 30-day wait between retakes, but that rule does not automatically apply to every 3G SMAW test. Ask your test administrator, because retest timing, required practice, and fees vary.
- What machine settings should I use for 3G vertical-up SMAW?
- There is no single amperage or polarity for every 3G test. The WPS and electrode manufacturer's recommendations are the controlling references. Vertical-up usually runs cooler than flat welding for the same electrode, so start at the lower end of the recommended range and adjust for puddle control and penetration. Never guess settings on a certification test.