Welding 7018 Vertical Up – Mastering The 3G Position For Stronger
To successfully weld 7018 vertical up, set your amperage 10-15% lower than your flat welding settings and maintain a tight arc length. Focus on building a “shelf” of molten metal and pausing briefly at the edges of the joint to prevent undercut and ensure a flat bead profile.
Keep your rod at a 5 to 10-degree upward travel angle and use a slight side-to-side weave to help the puddle freeze across the joint width. This technique ensures deep penetration and structural integrity for critical vertical repairs and fabrications.
Most welders agree that moving from flat bench work to vertical positions feels like learning to weld all over again. Gravity becomes your primary opponent, constantly trying to pull your molten puddle down toward your boots. However, learning the art of welding 7018 vertical up is a rite of passage that separates the weekend hobbyists from the true metalworkers.
I promise that once you understand how to manipulate the puddle and build a physical “shelf” for your metal to sit on, your confidence will skyrocket. You will stop fearing structural repairs and start looking for reasons to build taller, stronger projects in your shop.
In this guide, we will explore the exact machine settings, rod angles, and hand movements required to master the 3G position. We will cover everything from rod storage to troubleshooting common defects like undercut and slag inclusion. Let’s get that welder fired up and dive into the mechanics of vertical progression.
Mastering the Fundamentals of welding 7018 vertical up
The 7018 electrode is a low-hydrogen, basic-coated rod designed for high-strength structural applications. When you are welding 7018 vertical up, you are taking advantage of the rod’s fast-freezing slag and deep penetration characteristics. This position is often referred to as the 3G position in welding certifications, and it is the gold standard for structural integrity.
Gravity works against you in this orientation, but it also helps you see the puddle more clearly. By moving upward, you allow the heat to rise, which preheats the metal ahead of the arc. This creates a very fluid puddle that requires careful management to prevent it from spilling over or “dripping” out of the joint.
To succeed, you must change your mindset from “laying a bead” to “building a structure.” You are essentially stacking thin layers of molten steel on top of one another. Every movement must be deliberate, and every pause must be timed to allow the molten metal to solidify just enough to support the next layer.
Essential Equipment and Machine Settings
Before you strike an arc, you need to ensure your machine is dialed in correctly. Most beginners make the mistake of running their vertical beads too hot. While 125 amps might work perfectly for a 1/8-inch 7018 rod on a flat plate, it will likely cause your vertical puddle to sag and create a mess.
Choosing the Right Amperage
For 1/8-inch 7018 rods, try starting between 105 and 115 amps. If you are using 3/32-inch rods, aim for the 80 to 95-amp range. You want enough heat to fuse the metal into the base material, but not so much that the puddle becomes uncontrollable.
Polarity and Power Source
Ensure your machine is set to DCEP (Direct Current Electrode Positive), also known as “reverse polarity.” This setting provides the best penetration and a smoother arc for 7018 electrodes. If you are using an older AC-only transformer machine, make sure you are using rods specifically labeled as 7018-AC.
Rod Condition and Storage
The 7018 rod is hygroscopic, meaning the flux coating absorbs moisture from the air. Damp rods lead to porosity and hydrogen cracking. For critical structural work, always pull your rods from a sealed tin or a rod oven kept at roughly 250 degrees Fahrenheit.
Preparing the Joint for Vertical Success
You cannot get a clean weld on dirty metal, especially when working against gravity. Any mill scale, rust, or oil will cause the puddle to “dance” or spit, making it nearly impossible to maintain a steady shelf. Clean your work area at least one inch back from the joint using a flap disc or a wire wheel.
Fit-up and Tack Welding
Ensure your plates are clamped tightly with no excessive gaps unless the project specifically calls for a root opening. If you are practicing on a T-joint (fillet weld), make sure the vertical plate is perfectly 90 degrees to the base. Place strong tack welds at the top and bottom to prevent the metal from pulling as it heats up.
Positioning for Comfort
Comfort is the secret weapon of pro welders. If your arm is shaking, your weld will look like a sawtooth. Prop your elbow against a steady surface or use a welding stool to stabilize your body. You need to be able to move your hand in a smooth, upward motion for at least six inches without repositioning.
The Secret to Success: Building a Molten Shelf
The most critical concept to understand when welding 7018 vertical up is the “shelf.” As you strike the arc at the bottom of the joint, you create a small pool of molten metal. As you move slightly upward and pause at the sides, the center of that pool begins to solidify.
The Inverted V or Z-Weave
Most welders use a slight side-to-side motion. Think of it as drawing a very tight “Z” or an “inverted V” as you move up the plate. You move quickly across the center and pause at the toes (the edges) of the weld. This pause allows the metal to fill in the corners and prevents the dreaded “undercut” groove.
Managing the Arc Length
Maintain a very tight arc. If you pull the rod too far away from the metal (long-arcing), the voltage jumps, the heat increases, and the puddle will likely fall out. Keep the rod close enough that you can almost feel the flux coating touching the molten pool.
Rod Angle and Travel Speed
Hold the rod at a 5 to 10-degree upward angle. This “pushes” the metal into the joint and helps hold the puddle up. Your travel speed must be consistent; if you move too fast, the bead will be thin and weak. If you move too slow, the heat buildup will cause the puddle to sag.
Step-by-Step Guide to the Vertical Up Progression
- Strike the Arc: Start about half an inch above where you want the weld to begin, then quickly drag the arc down to the bottom. This preheats the starting point and prevents cold-start defects.
- Establish the Puddle: Hold the rod at the bottom until you see a distinct circle of molten metal form. This is your foundation.
- Begin the Weave: Move the rod to one side of the joint and pause for a count of “one.” You should see the liquid metal flow into the corner and level out.
- Cross the Center: Move quickly across the center of the joint to the other side. Do not linger in the middle, or the bead will become “humped” and excessively convex.
- Pause at the Opposite Toe: Pause again for a count of “one” on the other side. Watch the puddle fill the edge completely.
- Rhythmic Progression: Repeat this “side-pause-cross-side-pause” rhythm. As the metal gets hotter near the top, you may need to increase your travel speed slightly.
Common Mistakes and How to Fix Them
One of the most common issues people face while welding 7018 vertical up is slag inclusion. This happens when the molten slag gets trapped underneath the metal. Usually, this is caused by a travel speed that is too slow or an arc length that is too long.
Dealing with Undercut
Undercut is a groove melted into the base metal next to the weld that isn’t filled back in. This creates a major weak point. To fix this, increase your pause time at the edges of your weave. This gives the filler metal time to flow into the area the arc just carved out.
Preventing the “Grapes” Effect
If your weld looks like a bunch of grapes or a series of drips, your amperage is too high or your rod angle is too steep. Lower your heat by 5 amps and ensure you are pushing the puddle up with a slight upward angle rather than pointing the rod straight into the joint.
Porosity at the Start
If you see tiny holes (porosity) at the beginning of your weld, your rod is likely damp or you are long-arcing during the start. Try the “strike-ahead and drag-back” method mentioned earlier to ensure the shielding gas is fully established before you start depositing metal.
Safety Considerations for Vertical Welding
Vertical welding is inherently more dangerous than flat welding because the sparks and molten slag fall directly down. Gravity is not your friend when it comes to hot sparks finding their way into your clothing or boots.
- Wear Full Leathers: A leather welding jacket or at least leather sleeves are mandatory. A cotton shirt will burn through in seconds when a hot glob of 7018 slag hits it.
- Protect Your Feet: Ensure your pants go over the tops of your boots. Never tuck your pants into your boots, as this creates a funnel for red-hot metal to land on your socks.
- Use a Respirator: 7018 rods produce fumes that contain manganese. If you are in a confined space or a garage with poor airflow, wear a P100 welding respirator.
- Head Protection: Wear a leather hood or a “welding cap” under your helmet to prevent sparks from landing on your scalp or behind your ears.
Frequently Asked Questions About welding 7018 vertical up
Can I weld 7018 vertical down?
No, 7018 is not designed for vertical down welding. The slag is too fluid and will run ahead of the puddle, causing slag inclusions and lack of fusion. If you must weld downhill, use a 6010 or 6011 rod, though these are not structural equivalents.
Why does my 7018 rod keep sticking?
Sticking is usually caused by amperage that is too low or a “cold” machine. It can also happen if you are pushing the rod too hard into the puddle. Try increasing your amps by 5 or check that your work clamp (ground) is attached to clean, bare metal.
Is a weave bead better than stringer beads for vertical up?
For very thick plates, multiple stringer beads are often preferred by engineers because they limit heat input. However, for most DIY projects and thinner structural steel, a slight weave is easier to manage and helps ensure the edges are properly fused.
How do I know if my heat is right?
Listen to the sound. A well-tuned 7018 arc should sound like bacon frying. If it sounds like a roar, it’s too hot. If it keeps clicking or humming softly without a crisp crackle, it’s likely too cold.
Conclusion and Final Tips
Mastering the 3G position takes time, patience, and a lot of burnt rod ends. Don’t be discouraged if your first ten attempts look like a melted candle. The key to welding 7018 vertical up is the marriage of consistent rhythm and visual observation. Watch the “toes” of the weld, keep your arc tight, and don’t be afraid to adjust your amperage as the base metal heats up.
Start by practicing on scrap plate that is at least 1/4-inch thick. Thinner metal is much harder to weld vertically because it heat-soaks quickly and falls away. Once you can consistently produce a flat, ripple-patterned bead with no undercut, you’ll be ready to tackle any structural project that comes your way.
Remember, safety is your first priority. Keep your leathers on, your eyes protected, and your workspace clean. Now, grab a handful of 7018s, set your machine, and start building that shelf. You’ve got this!
