7018 vs 6011 vs 6013 Electrodes Explained
Understanding the three most common stick welding electrodes — when to use 7018 for structural strength, 6011 for dirty metal, and 6013 for beginner-friendly thin material work.
If you stick weld (SMAW), the electrode you choose determines everything about the weld — penetration depth, bead profile, slag behavior, and which positions you can weld in. The three most common electrodes for mild steel are 7018, 6011, and 6013. Each excels in different situations, and understanding when to reach for which rod is a fundamental welding skill.
Reading the Numbers
The AWS electrode classification (e.g., E7018) encodes four pieces of information. The "E" stands for electrode. The first two digits (70 or 60) indicate tensile strength in thousands of PSI. The third digit indicates welding positions (1 = all positions; 2 = flat and horizontal only). The fourth digit indicates the flux coating type, current type, and penetration characteristics.
E7018: The Structural Standard
7018 is the most widely specified structural welding electrode. The "18" designation means a low-hydrogen iron powder coating that produces smooth, strong, low-porosity welds with excellent mechanical properties. It is the go-to rod for anything that needs to pass inspection or bear a load — structural steel, pressure vessels, pipe, and any application where weld quality is critical.
Characteristics: Smooth, quiet arc. Minimal spatter. Heavy, fast-freezing slag that peels easily. Produces a flat to slightly convex bead profile. Excellent for fillet and groove welds in all positions (though it handles vertical and overhead better with some practice).
Limitations: 7018 rods are moisture-sensitive. The low-hydrogen coating absorbs atmospheric moisture, which introduces hydrogen into the weld and causes porosity and cracking. Store opened packages in a rod oven (250°F–300°F) and do not leave rods exposed to humid air for more than a few hours. This is not optional for structural work — moisture-compromised 7018 rods are a code violation.
Current: DCEP (electrode positive) or AC. DCEP produces the best results.
E6011: The Dirty-Metal Rod
6011 is a cellulosic-coated, deep-penetration rod designed to burn through rust, paint, mill scale, and contamination. It is the rod you grab when the material is not clean and you cannot or do not want to grind it first — field repairs, farm equipment, rusty pipe, and maintenance welding where preparation is impractical.
Characteristics: Aggressive, digging arc that penetrates deep into the base metal. More spatter and a rougher bead appearance than 7018. Produces a thin, friable slag. Runs well in all positions — vertical up with 6011 is a classic stick welding technique.
Limitations: The aggressive arc and deeper penetration make burn-through easier on thin material. The bead appearance is rougher than 7018, which matters for visible work. Not typically used for structural applications where smooth, inspectable welds are required.
Current: DCEP or AC. One of the few electrodes that runs well on both — making it popular with farmers and field welders using older AC-only "buzz box" machines.
E6013: The Beginner-Friendly Rod
6013 is a rutile-coated electrode designed for easy arc starting, smooth operation, and a clean bead appearance on thin to medium-thickness material. It is the rod most welding instructors put in a beginner's hands first because it is forgiving — easy to start, easy to maintain arc length, and produces a nice-looking weld without demanding advanced technique.
Characteristics: Smooth, quiet arc with minimal spatter. Produces a slightly convex bead with fine ripples. Easy slag removal. Low penetration compared to 6011 — it sits on top of the material rather than digging in. Excellent for sheet metal, thin-wall tubing, and cosmetic welds where appearance matters.
Limitations: The shallow penetration means 6013 is not suitable for structural applications or thick material where deep fusion is needed. It also does not perform well on dirty or rusty surfaces — the arc lacks the digging action to burn through contamination.
Current: AC, DCEP, or DCEN. Extremely versatile in terms of power supply compatibility.
Head-to-Head Comparison
| Feature | E7018 | E6011 | E6013 |
|---|---|---|---|
| Tensile strength | 70,000 PSI | 60,000 PSI | 60,000 PSI |
| Penetration | Medium | Deep | Shallow |
| Bead appearance | Smooth, flat | Rough, rippled | Smooth, fine ripples |
| Dirty material tolerance | Low — needs clean metal | High — burns through contamination | Low — needs clean metal |
| Positions | All positions | All positions | All positions |
| Arc characteristics | Smooth, quiet | Aggressive, digging | Smooth, easy |
| Spatter | Minimal | Moderate to heavy | Minimal |
| Storage requirements | Rod oven required | No special storage | No special storage |
| Best for | Structural, critical welds | Dirty/field repairs | Thin material, learning |
Which Should You Stock?
For a home shop, keep all three in your rod box. Use 7018 for anything that needs to be strong and clean. Grab 6011 when you are repairing dirty or rusty material in the field. Practice with 6013 when learning technique or welding thin stock where burn-through is a concern. Most experienced stick welders have a strong preference — but the best rod is always the one that matches the job.