6013 vs 7018 Welding Rod: Which One Should You Buy?

When choosing between a 6013 vs 7018 welding rod, the right pick comes down to joint strength, steel thickness, and metal cleanliness. A 6013 electrode is a general-purpose rod that starts easily, runs on low-voltage machines, produces shallow penetration, and works well for thin sheet metal, light fabrication, and quick repairs. A 7018 electrode is a low-hydrogen rod that delivers deeper penetration and higher tensile strength for structural steel, heavy equipment, and critical joints, but demands clean metal and strict moisture control. This guide compares them side by side for home, farm, and shop fabrication.

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The difference in one paragraph

Stick welding relies on a flux-coated core wire to shield the molten puddle from oxygen and nitrogen in the air. The difference between 6013 and 7018 lies in their flux coating chemistry and resulting joint properties. The 6013 rod uses a high-titania coating that yields a soft arc, minimal spatter, easy slag removal, and light to medium penetration suited for sheet metal and poor joint fit-up. The 7018 rod uses a low-hydrogen flux with iron powder that produces a strong puddle with high impact resistance, making it the standard choice for load-bearing welds, frames, and structural fabrication where cracking cannot be tolerated.

Side by side: 6013 vs 7018 welding rod

Feature	6013 Stick Rod	7018 Stick Rod	Best Application
Tensile strength rating	60,000 PSI tensile strength	Higher tensile strength for structural code work	7018 for load-bearing joints
Arc characteristics	Soft arc, easy strike and restrike	Smooth arc, can stick on cold starts	6013 for tacking and beginners
Penetration depth	Shallow to medium penetration	Medium penetration	6013 for sheet metal, 7018 for thicker plate
Flux coating type	High-titania rutile coating	Low-hydrogen iron powder coating	7018 needs moisture protection
Storage requirements	Standard dry room storage; handles ambient humidity	Absorbs ambient moisture; requires holding oven once opened for code work	6013 for occasional shop use
Base metal condition	Works best on clean metal, light rust	Requires clean metal, free of oil and rust	Clean joints for sound welds
Welding positions	All positions, vertical down capable	All positions; vertical progression must be vertical up	6013 for fast sheet metal passes
Slag removal	Heavy slag, easily chipped or self-cleaning	Heavy slag, easy to chip	Both chip away cleanly
Current and polarity	AC, DCEP, or DCEN	DCEP or AC	6013 on utility welders, 7018 on DCEP
Common uses	Sheet metal, light fabrication, repair	Structural steel, heavy equipment, trailers	Match electrode to joint load

Both electrodes run on alternating current (AC) and direct current (DC), but machine capability matters. Electrode specifications state that 6013 operates on AC, DCEP (electrode positive), or DCEN (electrode negative), and performs well on low open-circuit voltage machines. Standard 7018 runs best on DCEP for smooth metal transfer, though specialized AC versions exist for utility transformer welders. If you are selecting a power source, our stick welders hub covers machine ratings and duty cycles for home and shop use.

When 6013 is the better choice

• Thin sheet metal and light gauge steel. Because 6013 produces shallow to medium penetration, it reduces the risk of burning through thin metal plates, duct work, and sheet metal panels.
• Poor fit-up and wider gaps. The fluid puddle and fast freezing slag allow 6013 to bridge irregular gaps and poorly fitted joints without excessive sagging.
• Easy arc strike and restrike. The titania coating creates a soft arc that ignites effortlessly on low open-circuit voltage welders, making it forgiving for beginners and tack welding.
• Vertical down fillet welds. Reference listings note that 6013 features virtually self-cleaning slag in vertical down positions, allowing fast decorative or non-structural passes.
• Smooth bead appearance. It produces a flat bead profile with minimal spatter and easily chipped slag that requires minimal grinding.

For lighter projects where heat buildup causes burn-through, see our guide on stick welding thin metal.

When 7018 is the better choice

• Structural and load-bearing joints. Framing, trailer hitches, building columns, and heavy machinery mounts require the higher strength and ductility that 7018 provides.
• High impact and cold temperature service. The low-hydrogen weld metal resists brittle failure and cracking under shock loads, vibration, and dynamic stress.
• Thick steel sections and restrained joints. When welding thick plate, shrinkage stresses run high. The crack resistance of 7018 prevents underbead and toe cracking.
• Code-compliant fabrication. Structural welding standards frequently specify low-hydrogen filler metals for structural steel members.

For repairing heavy farm implements, tractor attachments, and structural machinery where strength is critical, see our comparison of a stick welder vs MIG welder for farm repairs.

Storage and moisture control

The flux coating on a 6013 rod is not low-hydrogen, which means it handles normal atmospheric humidity without degrading. Storing 6013 in a dry shop cabinet or sealed plastic storage tube keeps the rods ready for general repair work.

In contrast, 7018 features a low-hydrogen coating with mineral binders that readily absorb moisture from ambient air. Moisture introduces hydrogen into the molten weld pool, leading to hydrogen-assisted cracking in high-stress or thick steel joints. For code-level structural work, 7018 electrodes must be kept in a dedicated holding oven once the factory hermetic seal is opened. For home shops that do not own a commercial holding oven, our guide on how to store 7018 rods without a rod oven covers practical shop storage methods.

Amperage and electrode diameter

Selecting the right electrode diameter depends on your base metal thickness and machine output. Reference listings show specific operating ranges for 6013 across common diameters. For 3/32-inch 6013, YESWELDER recommends 45A-90A, while Forney lists an 80 A amperage capacity. For 1/8-inch 6013, YESWELDER recommends 80A-130A, while TOOLIOM lists 70A-120A. For heavier sections, Forney lists a 5/32-inch 6013 with a 170 A amperage capacity. Hobart lists a 60,000 PSI tensile strength for both its 3/32-inch and 1/8-inch 6013 electrodes.

Operating current ranges for 7018 depend heavily on joint position, coating formulation, and machine polarity. While flat fillets often run smoothly in a similar current band to 6013, vertical and overhead positions require dropping the amperage to prevent the puddle from spilling. Because manufacturer recommendations vary by brand, always consult the amperage range printed directly on your electrode packaging. To compare general current settings across stick diameters, refer to our welding rod amperage chart.

Can one rod handle every job?

Neither rod replaces the other because their operating characteristics match distinct jobs. For thin sheet metal, light gates, ducting, or quick cosmetic jobs on low-voltage hobby machines, 6013 is far easier to run and less prone to blowing holes through the steel. For trailer frames, heavy brackets, lifting eyes, and structural repairs that must endure dynamic loads, 7018 is essential because 6013 lacks the required yield strength and ductility. Keeping both rods in your shop gives you the right tool for both light fabrication and structural repairs.

Stick welding fumes and slag safety. Both electrodes generate welding fumes and hot slag. The mineral and iron powder flux produces smoke that must be kept out of your breathing zone; weld in a well-ventilated space or use forced exhaust. Chipping slag requires eye protection, as hardened flux flakes can fly off unexpectedly under tension. Always wear safety glasses beneath your welding helmet and use flame-resistant leather gloves and protective clothing. For equipment and gear advice, see our welding safety gear checklist for beginners.

Frequently Asked Questions

Is 7018 stronger than 6013?

Yes. In standard electrode classifications, 7018 provides higher minimum tensile strength and significantly higher impact toughness than 6013. That added ductility and crack resistance makes 7018 the standard choice for load-bearing structural joints and heavy machinery repair.

Can I run 6013 and 7018 on an AC welder?

Both rods can run on alternating current, but performance depends on the specific coating. Specifications for 6013 confirm smooth operation on AC machines, including low open-circuit voltage units. Standard 7018 runs best on DC reverse polarity, so welders running older AC buzz boxes should look for rods specifically labeled 7018 AC.

Why is 6013 called a beginner rod?

The high-titania coating on 6013 establishes and reignites an arc with very light contact, making it forgiving for operators learning arc length control. It produces a soft, stable puddle with low spatter and a slag blanket that chips away easily. It also tolerates lower open-circuit voltages than most low-hydrogen rods.

Do I need a rod oven for 7018 in a home shop?

Code-governed structural jobs require 7018 to be stored in an oven once the container is opened to prevent atmospheric moisture absorption. For non-code hobby and farm repairs, many welders store opened rods in sealed airtight tubes or buy small sealed packs for individual projects. If rods absorb moisture, they risk porosity and delayed underbead cracking.

Can 6013 weld over rust and paint?

A 6013 rod tolerates only light rust and mill scale because its shallow penetration cannot burn through heavy contamination. For heavily rusted, greasy, or painted steel, cleaning the joint with an angle grinder down to bare metal is always recommended before striking an arc.

Related: DC vs AC stick welding, how to strike an arc with a stick welder, how to stick weld rusty metal, and what 7018 means on a welding rod. Also see our guide on why a welding rod keeps sticking.

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