Vertical Stick Welding: Tips for Uphill & Downhill Welds

Vertical stick welding is essential for welding structures that can’t be moved, like steel beams and ship hulls.

Gravity makes controlling the weld pool tricky, but the right electrode, machine settings and technique can help. In this guide, we’ll cover uphill and downhill welds, and the best patterns and joints for strength or speed.

Why is vertical stick welding so difficult?

Vertical stick welding is harder than welding in a flat position because gravity pulls the molten weld pool downward. This makes it difficult to control, increasing the risk of imperfections and slag inclusions.

Welders must manage the heat input, travel speed, and electrode angle to prevent the weld from dripping.

Vertical welding positions (3G & 3F)

In welding, the number refers to the position, and the letter refers to the type of joint. 3G and 3F are two common vertical positions you may use when stick welding structures like steel beams or pipes.

• 3G (Groove Weld): The ‘G’ stands for groove weld, where the weld goes into a gap between two metal pieces, like in a butt joint. For example, welding a vertical seam on a pipe or column.
• 3F (Fillet Weld): The ‘F’ stands for fillet weld, which joins two pieces at a 90-degree angle, like in a T-joint or lap joint. Think of welding where an upright vertical plate meets a flat horizontal base.

As stick welding is good for outdoor welds, you may use these welding positions when fixing structures.

Key techniques for vertical stick welding

Mastering vertical stick welding takes skill and practice, but the right techniques can make it easier.

What types of weld joints are best?

The best joint for your vertical weld depends on how strong it needs to be and the materials you’re using. Access is also a factor, as on-site industries like construction or shipbuilding need welding in tight spaces.

• Butt Joints: Used for 3G (vertical groove) welds, where two plates are joined edge to edge. A strong joint, but require precise control and penetration, making them hard with limited room or visibility.
• T-Joints: Common in 3F (vertical fillet) welds, where a vertical plate is welded to a horizontal plate at a 90-degree angle. Often used for structural frames, they offer more room to control the electrode.
• Lap Joints: Where one plate overlaps the other, creating a fillet weld along the edge. Can be useful for thinner materials, and also allows for more electrode movement and better weld pool control.

Want to find out more? Visit ESAB University for our dedicated guide to common types of weld joints.

Uphill vs Downhill for Vertical Stick Welding

For horizontal (flat) welds, you use a pulling or pushing technique. For vertical, you weld up or down.

To weld uphill, hold at a push angle and move steadily upward. Downhill, drag faster to prevent buildup.

Weave patterns for vertical MMA welds

Weaving in vertical stick welding involves moving the electrode side to side to improve fusion and control over the weld pool. The right weave pattern can help to prevent defects and ensure a stronger weld.

• Z Pattern: A zigzag motion that provides deep penetration and strong fusion to the base, making it ideal for uphill welding on thicker materials. Common in structural steel and thick pipe welding.
• Triangle Pattern: Similar to the Z pattern, but with a pointed peak at the top. It offers better heat control and bead consistency, reducing defects in welds where strength and stability are critical.
• Stringer Beads: A simple straight-line technique without weaving, best for downhill stick welding on thinner vertical materials where speed is the priority, such as quick repairs or pipe welding.

What is the stacking technique?

The stacking technique is where you create a series of overlapping weld beads resembling a stack of coins. It’s used to improve the appearance, strength, and fusion of a weld, especially in vertical and pipe welding.

Instead of dragging the weld pool, you pause to let it cool and let the metal fuse, then repeat the process.

The stacking technique is often used in structural welding, filling large gaps, or where a uniform appearance is beneficial. It offers better control of the weld pool and strong welds, as each pause allows proper fusion.

Now you know a bit more about vertical stick welding techniques, where is it commonly used?

When might you need vertical stick welding? 

Vertical stick welding is best suited to outdoor, hard-to-reach jobs where moving the workpiece isn’t possible.

Unlike MIG or TIG welding, stick welding doesn’t need shielding gas. This makes it easier to use on-site, or in windy or dirty environments, such as construction sites or shipyards. It’s ideal for rugged, heavy-duty repairs.

1. Welding vertical pipes: Vertical stick welding can be used on oil and gas pipelines, as it’s wind-resistant and portable. For strong welds on thick pipes, try a triangle or zigzag pattern.
2. Welding structural beams: Large steel structures, like bridges, require strong welds. Stick welding is ideal for thick materials and can offer strong and durable welds with an uphill weave pattern.
3. Welding a ship’s hull: Stick welding works well for offshore repairs, as it can handle dirty or rusty surfaces. In non-critical areas, downhill works for quick repairs, while uphill is ideal for strong joints.

When stick welding isn’t ideal for vertical welding

Stick welding isn’t always the best choice for vertical welds, especially if precision or looks are a priority.

MIG welding may be better for thin sheet metal in automotive repairs or ductwork, as it offers more control and reduces warping. MIG welding is also preferred in factories for its speed and potential for automation.

For stainless steel and aluminium (such as in food or aerospace), TIG welding provides a cleaner finish.

Vertical stick welding machine settings

ESAB offers a wide range of reliable stick welding equipment, ideal for challenging construction, shipbuilding, and pipeline welds. However, you need the right settings to get the most out of your machine.

• Amperage: This is the strength of the electrical current, and can affect the penetration and stability of the welding arc. Uphill welding requires a lower amperage to help control the runny weld pool.
• Polarity: Positive DC gives deeper penetration, making it ideal for heavy-duty uphill welds. Negative DC (or AC) offers control on thin metals. Find out more about how polarity affects stick welding here.
• Arc Length: Keeping a short arc can help prevent excess splatter and loss of control, particularly for vertical welds that need a clean and precise join. Vertical stick welding produces slag by definition.

For example, for strong and slow uphill welds, you might use low amperage, DC+ and a short arc for deep penetration and control. For fast downhill welds, you might use a higher amperage with a DC- polarity.

Start with a lower amperage and adjust until you have a stable weld pool, and take time to practice.

Best electrodes for vertical stick welds

Stick welding requires using an electrode, which is consumed as part of the welding process.

Choosing the right electrode is important for controlling the weld pool for strong, defect-free vertical joins. Stick welding electrodes are classified by their strength, welding position suitability, and flux coating type.

Each electrode has an outer flux coating that vaporises and acts as a gas shield during stick welding. This prevents external contaminants from entering the weld. After welding, the flux coating solidifies, forming a layer of slag over the weld. This protects the weld pool whilst cooling, but needs to be removed afterwards.

For beginners learning stick welding, E6013 electrodes are a popular choice. They are considered general-purpose, work well in various applications, can be used in all positions, and are easy to strike.

ESAB offer a huge range of stick welding electrodes in their filler metals, including for vertical positions.

Final tips for vertical stick welding

Now you know more about vertical stick welding, here’s some helpful advice from our welding experts.

• Prioritise safety: This type of welding can cause splatter and falling slag, so it’s essential to wear welding PPE and safety gear to protect yourself, including a helmet, clothing, and suitable shoes.
• Prevent overheating: If the filler metal overheats, pull the rod away from the pool without breaking the arc. This allows the metal to solidify before starting again, preventing excess dripping. When experimenting with machine settings, start with a low amperage and turn up the heat as needed.
• Watch the weld pool: Read the pool’s behaviour to maintain a clean and stable bead. In weave and stacking techniques, ensure slag drips off naturally while the weld pool remains controlled.
• Avoid undercutting: Weaving too fast or too hot can gouge your previous work, so reduce your amperage and work slowly as you need to, to ensure you control the weld pool properly.
• Hold it at the right angle: Prevent poor weld quality by holding the electrode at the correct angle when welding. T-joints and lap joints need a right angle, or controlling the pool can be tricky.

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