Stick Welding 3G – Master Vertical Up Positions For Stronger
Stick welding 3G refers to a vertical position welding test performed on plate steel, typically moving from the bottom to the top (vertical up). This technique is essential for structural integrity as it ensures deep penetration and a strong bond between thick metal plates.
Success in this position requires maintaining a tight arc, managing a “molten shelf,” and using specific rod manipulation like the “Z-weave” to prevent the metal from sagging or creating undercuts.
Most DIY welders feel comfortable working on a flat workbench where gravity helps the puddle stay put. However, once you move your projects to the wall or a vertical frame, gravity becomes your biggest enemy. Mastering stick welding 3g is the moment you transition from a casual hobbyist to a skilled fabricator capable of building structural-grade projects.
I promise that by understanding the mechanics of the vertical-up position, you will stop fighting the molten metal and start controlling it. This guide will break down the exact settings, rod angles, and movements you need to produce professional-quality welds. We will cover everything from the initial root pass to the final decorative cap so you can tackle your next garage project with total confidence.
In the following sections, we will explore the essential tools, the “shelf” technique, and how to troubleshoot the most common vertical welding mistakes. Whether you are prepping for a certification or just want your utility trailer to hold together, this deep dive into stick welding 3g has you covered.
Understanding the Fundamentals of the Stick Welding 3G Position
In the world of welding certifications, “3G” is a specific designation that refers to a vertical groove weld on a plate. Unlike the 1G (flat) or 2G (horizontal) positions, the 3G position requires you to move the electrode vertically along the joint. While you can weld “vertical down” for thin sheet metal, true structural work almost always demands “vertical up” progression.
The primary challenge of this position is managing the molten puddle as gravity tries to pull it toward the floor. To succeed, you must learn to create a “shelf” of solidified metal. Each movement of your rod builds upon the previous layer, effectively stacking the weld beads like bricks in a wall.
The Difference Between Vertical Up and Vertical Down
Vertical down welding is fast and produces less heat, making it great for thin materials like auto body panels. However, it lacks the deep penetration required for structural steel. If you try to weld a thick plate vertically down, the molten slag often outruns the puddle, leading to slag inclusions and a weak joint.
Vertical up welding, which is the standard for stick welding 3g, provides much deeper penetration. Because you are fighting gravity, you move slower, which allows the arc to dig deep into the base metal. This results in a weld that is significantly stronger and more reliable for load-bearing structures.
Why This Skill Matters for DIYers
You might wonder why a backyard tinkerer needs to learn a professional certification technique. The answer is simple: versatility. If you are repairing a tractor, building a heavy-duty storage rack, or fixing a gate post, you cannot always flip the workpiece onto a table. Learning to weld in place allows you to handle repairs that would otherwise be impossible.
Essential Gear and Material Preparation
Before you strike an arc, you need the right setup. Vertical welding is messy because sparks and molten “berries” fall straight down. Ensure you are wearing a leather welding jacket or at least heavy-duty leather sleeves. A welding cap under your helmet is also non-negotiable to prevent hot sparks from landing in your hair or ears.
Choosing the Right Electrodes
For a standard 3G test or project, you will typically use two types of rods: E6010 and E7018. The 6010 is a “fast-freeze” rod, meaning the puddle solidifies almost instantly. This makes it perfect for the root pass, where you need to bridge a gap without the metal falling through.
The E7018 is a low-hydrogen rod known for producing incredibly strong welds with a smooth finish. It is the gold standard for the “fill” and “cap” passes in stick welding 3g. Unlike the 6010, the 7018 produces a lot of slag, so you must be careful to keep your arc tight to prevent trapping that slag inside the weld.
Preparing the V-Groove Joint
Preparation is 90% of the job in welding. For a 3G plate, you should bevel the edges of your steel to a 37.5-degree angle, creating a total 75-degree included angle when the plates are joined. Leave a small flat area at the bottom of the bevel, known as the root land, about the thickness of a nickel.
Clean the metal thoroughly using an angle grinder with a flap disc or wire wheel. Remove all mill scale, rust, and oil at least one inch back from the weld zone. Any contamination will cause porosity, which is especially problematic in vertical welds where the puddle is already difficult to manage.
Setting Up Your Welding Machine
Your machine settings will make or break your vertical weld. If the amperage is too high, the metal will become too fluid and “drip” out of the joint. If it is too low, the rod will stick, and you will struggle with cold lap, where the weld sits on top of the metal instead of fusing with it.
Amperage Ranges for Vertical Up
For a 1/8-inch E7018 rod, a good starting point is between 110 and 120 amps on DCEP (Direct Current Electrode Positive). When moving from flat to vertical, you generally want to drop your amperage by about 10% to 15%. This slight reduction gives you more control over the puddle’s fluidity.
Polarity and Arc Force
Ensure your machine is set to DCEP (Reverse Polarity). This setting puts more heat into the electrode, which helps with the “stacking” action required for vertical work. If your machine has a “Dig” or “Arc Force” setting, turning it up slightly can help prevent the rod from sticking when you maintain a very tight arc length.
The Core Technique: Mastering the Vertical Up Motion
Once your plates are tacked and your machine is set, it is time to weld. The secret to stick welding 3g is the rod angle. You want a slight “lead” angle, pointing the rod up at about 5 to 10 degrees. This helps the arc force push the molten metal upward, resisting the pull of gravity.
Executing the Root Pass with E6010
Start at the bottom of the joint. Use a “whip and pause” motion. Strike the arc, push it into the root gap to create a keyhole (a small circular hole indicating full penetration), then whip the rod slightly up and out of the puddle. As the metal solidifies, bring the rod back into the puddle to add more filler.
The Fill and Cap with E7018
The fill passes are where you build the bulk of the weld. Use a “Z-weave” or a slight side-to-side oscillation. The most important rule is to pause at the sides. Count “one-one-thousand” at each edge of the bevel before moving across the center.
The center of the weld will naturally stay hot and fill up. If you do not pause at the sides, the edges will remain thin, creating a groove called undercut. Undercut is a major structural defect that can cause the weld to crack under stress. By pausing at the edges, you allow the filler metal to fill in that “dug out” area.
Common Challenges in Stick Welding 3G
Even experienced welders struggle with the vertical position occasionally. The most common issue is the “grapes” or “berries” effect, where large blobs of metal fall out of the joint. This usually happens because the puddle got too hot. If this happens, stop, let the metal cool, and slightly lower your amperage.
Managing Heat Soak
As you move up the plate, the metal absorbs heat. By the time you reach the top three inches, the plate might be so hot that the weld starts to sag. To combat this, you can either increase your travel speed or stop briefly to let the plate cool. In a professional setting, we call this managing interpass temperature.
Maintaining a Tight Arc
In flat welding, you can get away with a slightly long arc. In vertical welding, a long arc is a recipe for disaster. It creates excess heat and makes the puddle uncontrollable. Keep your rod tip as close to the metal as possible without sticking it. A tight arc concentrates the heat exactly where you need it.
Safety Practices for Vertical Welding
Vertical welding poses unique risks. Because you are looking up, gravity pulls sparks directly toward your face and chest. Always ensure your helmet’s protective lens is clean so you can see the puddle clearly without leaning in too close.
- Leather protection: Use a full leather apron or jacket to protect your torso from falling slag.
- Boot safety: Ensure your pants cover the tops of your boots so sparks don’t fall inside.
- Ventilation: Vertical welding often produces more concentrated fumes; always work in a well-ventilated area or use a respirator.
Frequently Asked Questions About Stick Welding 3G
What does the “3” and “G” stand for?
The “3” represents the vertical position, and the “G” stands for a groove weld (as opposed to an “F” for a fillet weld). This is a standard classification used by the American Welding Society (AWS).
Can I use E6011 instead of E6010?
Yes. E6011 is the AC-compatible version of E6010. It behaves very similarly and is an excellent choice for DIYers using smaller “cracker box” style welders that only output AC current.
How do I prevent undercut on my final cap?
The best way to prevent undercut is to reduce your arc length and ensure you are pausing long enough on the edges of your weave. If you see a “valley” at the edge of your weld, you need to slow down your side-to-side movement.
Why is my slag so hard to remove?
If your 7018 slag doesn’t “peel” off easily, it usually means your amperage is too low or your travel speed is inconsistent. A well-run 7018 bead in the vertical position should have slag that almost lifts off by itself once it cools.
Final Thoughts on Mastering the Vertical Position
Mastering stick welding 3g is a rite of passage for any serious metalworker. It requires a blend of patience, steady hands, and a deep understanding of how heat affects metal. Don’t be discouraged if your first few attempts look like a mess of melted candles. It takes practice to find the rhythm of the “Z-weave” and the perfect pause at the edges.
Start with scrap pieces of 3/8-inch plate. Practice your root passes until you can consistently see that keyhole forming, then move on to stacking your 7018 fill beads. Once you can control the puddle in a vertical climb, you will find that almost every other welding position becomes significantly easier.
Remember, the goal is structural integrity. A pretty weld is nice, but a weld with deep penetration and zero undercut is what keeps your projects safe and durable. Keep your arc tight, watch your rod angles, and keep practicing. You’ll be amazed at how quickly your skills progress when you stop fearing gravity and start using it to your advantage. Happy welding from The Jim BoSlice Workshop!
