What Are Stick Welding Electrode Charts?

Stick welding electrode charts are structured reference tools that list the physical and performance properties of different covered electrodes. They serve as a quick-lookup guide for selecting the right rod based on the base metal, joint thickness, welding position, power source type, and environmental conditions. These charts are compiled from American Welding Society (AWS) classifications and manufacturer test data and are available in printed welding handbooks, on manufacturer websites, and within welding equipment user manuals.

Beyond simply naming electrodes, these charts provide operating parameters such as recommended amperage ranges, polarity (DCEN, DCEP, or AC), and mechanical property expectations like tensile strength and impact toughness. Proper interpretation of this data directly affects weld quality, penetration depth, slag removal ease, and overall cost efficiency. Without the ability to read an electrode chart, welders risk selecting the wrong rod for critical code work, leading to rejections and rework.

The History and Standardization of Electrode Coding

Modern electrode classification systems emerged from the need for consistent weld quality during the industrial boom of the early 20th century. The AWS began publishing standards for carbon steel covered arc welding electrodes in the 1940s. These standards evolved into the current AWS A5.1 specification (and the international counterpart ISO 2560), which assigns a systematic alphanumeric code to every electrode. This code communicates, at a glance, the tensile strength, welding position capability, type of covering, and current compatibility of each rod.

Understanding the standardization helps welders avoid confusion when switching between brands. For example, an E7018 electrode from Lincoln Electric, Miller, ESAB, or any other major manufacturer will meet the same AWS chemical and mechanical requirements and produce comparable weld metal properties under the same operating conditions. This consistency is the backbone of the chart system: manufacturers test their electrodes against the AWS standard and print the recommended settings in their charts. The welder’s job is to read that chart and apply the correct parameters.

Decoding the AWS Electrode Classification System

The typical code for a mild steel stick electrode reads like E6013 or E7018. Each character carries specific meaning, and the chart will expand on those meanings with detailed operating data.

Tensile Strength Numbers

The first two or three digits after the letter E indicate the minimum tensile strength of the deposited weld metal in thousands of pounds per square inch (ksi). For E60XX electrodes, the tensile strength is 60 ksi (approx. 410 MPa). For E70XX, it is 70 ksi (approx. 480 MPa). This is one of the most critical pieces of information on an electrode chart because it must match or exceed the strength of the base metal. Charts from manufacturers often list these mechanical properties alongside the classification code so you can verify the strength spec before striking the arc.

Welding Position Designations

The third (or second-to-last) digit indicates the welding position for which the electrode is primarily designed:

  • 1 – All positions (flat, horizontal, vertical-up, vertical-down, and overhead). Examples: E6010, E6011, E7018.
  • 2 – Flat and horizontal positions only. Example: E6027.
  • 4 – Flat, horizontal, vertical-down, and overhead – often used with low-hydrogen electrodes. Example: E7048.

Charts will also specify if the electrode can be used vertical-up (uphill) or vertical-down (downhill) and may provide recommended travel speeds and weave techniques for each position. Always check this section of the chart: using a position-2 rod overhead will likely result in a weld puddle that falls out.

Coating and Current Type

The last digit (or the last two digits in some codes like E7018H4R) describes the covering type and the compatible current. This digit determines slag characteristics, arc stability, penetration profile, and whether the rod works on AC, DCEN, or DCEP. For example:

  • 0 – High cellulose sodium coating, deep penetration, DCEP only. Example: E6010.
  • 1 – High cellulose potassium coating, deep penetration, AC or DCEP. Example: E6011.
  • 2 – High titania sodium coating, medium penetration, AC or DCEN. Example: E6012.
  • 3 – High titania potassium coating (rutile), light to medium penetration, AC or DCEP. Example: E6013.
  • 8 – Low hydrogen potassium (or sodium) coating, medium penetration, AC or DCEP. Example: E7018.

The electrode chart will list the polarity and current type next to each classification. For instance, an E6010 row might say “DCEP only,” while an E7018 row might show “DCEP recommended, AC acceptable with reduced arc force.” Ignoring these polarity specs can create an unstable arc and poor slag cleaning.

Common Stick Electrode Types and Their Applications

Electrode charts group rods into families based on coating chemistry and running characteristics. Understanding these families makes chart navigation faster.

E6010 and E6011

These are fast-freeze, deep-penetration electrodes used in pipe welding, structural steel repairs, and galvanized material. E6010 requires a DC power source with electrode positive (DCEP). E6011 works on AC, making it useful on job sites where only AC machines are available. Charts show that these rods produce a forceful arc with minimal slag and can weld through dirt, rust, and oil better than any other class.

E6012 and E6013

E6012 is a fill-freeze rod suited for high-speed, low-amperage welding of thin sheet metal. It can run on AC or DCEN and produces a concave bead. E6013 is a general-purpose electrode ideal for clean, new steel in home workshops and light fabrication. Charts for E6013 indicate lower amperage ranges per diameter compared to E6010, as well as easy slag removal and a smooth arc.

E7018 and Low-Hydrogen Electrodes

E7018 is the most widely used structural electrode for critical welds on carbon steel. It has a low-hydrogen coating (below 0.6% moisture content in the covering) that prevents hydrogen-induced cracking in thick, high-carbon, or highly restrained joints. Electrode charts for E7018 always state the required storage temperature (typically 250°F to 300°F / 120°C to 150°C) and the time allowed for which the rod can remain outside the oven before it must be reconditioned. This information is vital for compliance with structural welding codes such as AWS D1.1.

E7024 and Other High-Deposition Electrodes

E7024 is an iron-powder, high-deposition electrode rated for flat and horizontal fillet welds. It allows travel speeds 25% to 50% faster than E7018 and produces very heavy slag that self-peels. Charts show higher amperage ranges per diameter and often include deposition rates in pounds per hour (lb/hr). These rods are popular in shipbuilding and heavy fabrication shops where productivity is king.

How to Read an Electrode Chart: Key Parameters

Once you understand the AWS code, the chart becomes a map of operating windows. Here are the essential columns and what they mean.

Electrode Diameter

Electrodes are sold in diameters ranging from 1/16 inch (1.6 mm) up to 1/4 inch (6.4 mm) or larger. The chart will list the diameter in both fractional inches and millimeters. Selecting the correct diameter for the material thickness is fundamental: for metal under 1/8 inch thick, use 1/16 or 3/32 inch rods; for material 1/8 to 1/4 inch, use 1/8 inch; for thicker joints, use 5/32 inch and above. Charts often include suggested base metal thickness ranges alongside each diameter.

Current Type and Polarity

Every chart row contains a column indicating whether the electrode requires DCEP (direct current electrode positive), DCEN (direct current electrode negative), AC, or any combination. Some rods, like E6012, run on both AC and DCEN, giving welders flexibility. Others, like E6010, are restricted to DCEP. Using the wrong polarity will produce a wandering arc, excessive spatter, and poor fusion. Always verify the polarity before adjusting the machine.

Amperage Range

Amperage ranges are the meat of the electrode chart. They are listed as a minimum, typical, and maximum value for each diameter and position. For example, an E7018 rod of 1/8 inch diameter may have a range of 90 to 160 amps for flat welding but only 80 to 110 amps for vertical-up. These ranges are not arbitrary—the lower end corresponds to low-heat input for positional work; the upper end is for high-deposition flat passes. Welding outside this range leads to either slag entrapment (too low) or burn-through and excess spatter (too high).

Welding Positions

Charts denote position capability with a note or a series of checkmarks next to each electrode. Some electrodes are rated for all positions, but not with the same amperage. A chart may state “Flat (F), Horizontal (H), Vertical (V), Overhead (OH)” and then list separate amperage settings for each. For instance, running an E7018 vertical-up typically requires amperage 10 to 20% lower than flat. The chart is your guide to make that adjustment without guesswork.

Practical Tips for Selecting the Right Electrode

Start by identifying the base metal specification and thickness. For low-carbon steel (ASTM A36, 1018) used in general fabrication, E7018 is the default choice. For thin sheet metal (above 18 gauge), E6013 is often easier to start and prevents burn-through. For outdoor or windy conditions, E6011 or E6010 are preferred because they cut through surface contaminants and their arc is less sensitive to drafts.

Next, look at the joint geometry and required weld position. If the weld must be made overhead or vertical-up, choose an electrode with a “1” position code. Then check the chart for that electrode’s recommended amperage for the specific position. Many experienced welders mark the chart with notes like “Set to 95A for 3/32 E7018 vertical-up” for quick reference on the job.

Also consider the need for preheat and interpass temperature. Charts for low-hydrogen electrodes often include guidelines on carbon equivalent and required preheat from codes like ASME Section IX or AWS D1.1. Do not ignore these notes—they prevent cold cracking in hard-to-weld steels.

Finally, factor in the power source available. A small AC-only machine cannot run E6010, but can run E6011 or E6013 with excellent results. Match your rod to your machine’s output capabilities; the chart will tell you definitively.

Common Mistakes When Interpreting Electrode Charts

One frequent error is confusing the tensile strength digit for an absolute number. E7018 rod does not produce 70,000 psi in all positions—the strength depends on weld quality, heat input, and post-weld cooling rates. Charts give minimum guaranteed strength, not typical values. Another mistake is assuming the recommended amperage range is safe for all thicknesses. The chart’s amp range is valid only if the base metal thickness is adequate. For joints that are thin or have large root openings, you must adjust downward. Ignoring polarity restrictions is another common pitfall: running an E6010 electrode on AC yields a noisy arc and poor penetration. Finally, many welders skip the storage condition notes on low-hydrogen rods. An E7018 that has absorbed moisture will produce porous, hydrogen-cracked welds even if the chart settings are perfect. Always check the row that says “Storage: 250°F maximum, re-dry if out of oven over 2 hours.”

Storage and Handling of Stick Electrodes

Electrode charts often include a separate section dedicated to storage and rebaking because moisture in the flux coating is the leading cause of hydrogen cracking in steel welds. Low-hydrogen electrodes (E7018, E8018, etc.) require tight moisture control. The chart will specify a maximum relative humidity (typically 60% or less) for open air exposure and a storage temperature (usually 250°F to 300°F). If electrodes have been left in a humid environment, the chart will give a rebaking schedule—for example, two hours at 500°F. For cellulose electrodes (E6010, E6011), the chart will caution against oven drying, as high heat damages the coating. Instead, they should be kept sealed in their original packaging. Reading these notes ensures you get the weld properties the chart promises.

For additional authoritative reference, consult the Lincoln Electric electrode selector guide and the Miller welding resource library. The full AWS A5.1 specification can be accessed through the American Welding Society for engineers and inspectors. For deeper understanding of stick welding techniques, ESAB’s stick welding buyer guide is an excellent external resource.

Conclusion

Mastering how to read and interpret stick welding electrode charts transforms a simple list of numbers into a powerful decision-making tool. Each row on the chart tells you the rod’s strength limit, positional capability, current requirements, and optimal amperage—details that directly impact weld quality, safety, and project turnaround. By learning the AWS classification code, understanding the meaning behind each column, and heeding the storage and application notes, you can eliminate guesswork and achieve consistent, code-compliant welds. Whether you are preparing for a structural steel certification or repairing farm equipment, the electrode chart is your most reliable guide. Keep a copy in your toolbox, reference it every time you strike an arc, and your welds will reflect the care you put into selecting the right rod.