How to Read AWS Classification for Welding Electrodes?

A welding electrode’s label can look like a string of numbers until you know what each part tells you. Aws Classification provides a standardized way to identify electrode type and key performance characteristics. Consider E7018, a common low-hydrogen electrode. “E” identifies an electrode, while “70” indicates a minimum tensile strength of 70,000 psi under the applicable classification. The next digit relates to welding positions. The final digit helps identify the coating and usable current characteristics. Useful clues. But the code is not the whole story.

This guide explains how to read AWS electrode designations without treating every marking as interchangeable. You will learn what the main characters mean, where supplementary designators appear, and why the governing AWS specification matters. A package may show a classification, diameter, and recommended current range; each detail can affect electrode selection and setup. Check the manufacturer’s data sheet and the project’s approved welding procedure before relying on a label alone. Standards and product details can vary. That deserves a second look.

Reading the code is a practical starting point, not a substitute for sound welding judgment. Base-metal composition, joint design, position, and service conditions also shape the choice. Even a familiar electrode may behave differently when storage or handling is poor. This article offers a clear method for decoding the marking, while noting where the code leaves questions unanswered. The aim is informed selection—not guesswork.

Table of Contents [Hide]

1 Begin with AWS A5.1: The Standard for Carbon-Steel Covered Electrodes

2 Decode E7018: “E” Means Electrode; “70” Means 70,000-psi Tensile Strength

3 Read the Position Digit: “1” Designates All-Position Welding

4 Interpret “18”: E7018’s Final Digits Identify Coating and Current Type

5 Check AWS A5.1 Details: E7018 Uses Low-Hydrogen Iron-Powder Coating and AC or DCEP

Begin with AWS A5.1: The Standard for Carbon-Steel Covered Electrodes

AWS A5.1 is the standard used to classify covered electrodes for carbon-steel welding. Its code is more than a label on a package. It gives practical clues about strength, welding position, and coating type. Read it before choosing a rod, then compare it with the base metal and the job requirements.

Take E7018 as an example. “E” identifies an electrode, while “70” indicates a minimum tensile strength of 70,000 psi. The “1” means it is suitable for all positions. The final “8” identifies a low-hydrogen iron-powder coating and relates to its usable current types. That matters. A rod marked E6010 carries different coating and current characteristics, so the arc and handling can feel quite different. Classification helps explain why.

In the shop, check the full marking, not just the strength number. Keep the electrode package label nearby, especially when several types are open. A damp coating or a mismatched welding procedure can undermine an otherwise sensible choice. The code is useful, but it is not the whole story. Confirm the electrode’s current range and storage guidance, and consider the joint, thickness, and welding position. Even experienced welders can pause over a suffix. That small hesitation is better than assuming every electrode with a familiar number behaves the same way.

How to Read AWS Classification for Welding Electrodes? - Begin with AWS A5.1: The Standard for Carbon-Steel Covered Electrodes

AWS A5.1 classifies covered electrodes for shielded metal arc welding of carbon steel. In an electrode designation such as E7018, the letters and numbers identify the product form, minimum tensile-strength class, welding positions, and a coating/current-use group.

Classification element	What it indicates	Example: E7018
E	An electrode used for arc welding.	E
First two or three digits	Minimum tensile-strength class in ksi. Four-digit designations use the first two digits; five-digit designations use the first three.	70 = minimum 70 ksi (approximately 490 MPa)
Next-to-last digit	Permitted welding position, as defined by the classification.	1 = all positions
Last digit	A combined coating and usable-current/polarity group. It is interpreted together with the full classification, not as a standalone code.	8 = low-hydrogen potassium coating with iron powder; AC or DC, including either polarity

Common AWS A5.1 Classification Examples

Classification	Minimum tensile strength	Position code	Typical coating / current group	Practical reading note
E6010	60 ksi (approximately 410 MPa)	1 — all positions	High-cellulose sodium; DC electrode positive (DCEP)	A typical classification for deep-penetrating, fast-freeze welding.
E6011	60 ksi (approximately 410 MPa)	1 — all positions	High-cellulose potassium; AC or DCEP	The potassium-bearing coating permits AC use as well as DCEP.
E6012	60 ksi (approximately 410 MPa)	1 — all positions	High-titania sodium; AC or DC, typically DCEP or DCEN	Often associated with a relatively shallow-penetrating arc.
E6013	60 ksi (approximately 410 MPa)	1 — all positions	High-titania potassium; AC or DC, either polarity	Commonly chosen for a smooth arc and easy slag removal.
E7014	70 ksi (approximately 490 MPa)	1 — all positions	Iron-powder titania; AC or DC, either polarity	Iron powder supports higher deposition than comparable non-iron-powder types.
E7018	70 ksi (approximately 490 MPa)	1 — all positions	Low-hydrogen potassium with iron powder; AC or DC, either polarity	A low-hydrogen classification; storage and handling instructions matter.
E7024	70 ksi (approximately 490 MPa)	2 — flat and horizontal fillet	Iron-powder titania; AC or DC, either polarity	Designed for high deposition in its permitted positions.
E7048	70 ksi (approximately 490 MPa)	4 — includes vertical-down capability	Low-hydrogen potassium; AC or DC, typically DCEP	The position digit distinguishes it from the all-position E7018 classification.

Note: Tensile-strength values shown are minimum classification values. Actual operating recommendations, mechanical properties, and any optional supplementary designators should be checked against the applicable AWS A5.1 edition and the electrode’s technical documentation.

Decode E7018: “E” Means Electrode; “70” Means 70,000-psi Tensile Strength

AWS classification begins with a compact code stamped on the electrode. In E7018, “E” means electrode. The number “70” indicates a minimum tensile strength of 70,000 pounds per square inch for the deposited weld metal. It does not describe the strength of the electrode itself or guarantee the finished joint will reach that value. That distinction matters.

On a workbench, the code can look like a quick strength rating, but it is only one part of selection. Joint design, base-metal condition, fit-up, and welding procedure all affect the result. A clean bead cannot compensate for a poor match or careless preparation. I still double-check the classification before opening a new container; a familiar-looking code is easy to misread under shop lighting. Small detail, big consequence.

Tips: Read “70” as a minimum tensile-strength classification, not a promise for every weld. Check the full electrode code and applicable procedure before welding. Keep the package label nearby, especially when several electrode types are in use.

Read the Position Digit: “1” Designates All-Position Welding

In an AWS electrode classification, the position digit is a practical clue, not decoration. Under AWS A5.1/A5.1M:2021, the “1” in E7018 designates an electrode classified for all-position welding. That includes flat, horizontal, vertical, and overhead work. The same code gives other useful data: “70” indicates a minimum tensile strength of 70 ksi, while the final digits identify coating and current characteristics.

On a job, this matters when a welder moves from a flat plate to a vertical joint or overhead repair. An E7018 marked with “1” is classified for those positions, but technique still matters. Keep a short, controlled arc; watch the puddle edge; and adjust travel speed before metal starts to sag. Small electrode diameters and the welding procedure can affect practical performance. The code is not a promise that every setup will feel easy.

Check the applicable AWS classification table and the electrode’s technical sheet before choosing consumables. That detail is easy to miss. A classification describes standardized capabilities, not every shop condition. Heat input, joint design, and operator skill still shape the result. I would not treat the “1” as permission to ignore a test weld; overhead puddles can expose a rushed choice quickly.

Interpret “18”: E7018’s Final Digits Identify Coating and Current Type

How to Read AWS Classification for Welding Electrodes?

In E7018, “E” means electrode, “70” indicates a minimum tensile strength of 70,000 psi, and “1” identifies all-position use. The final “8” describes the coating and compatible current. It indicates a low-hydrogen, iron-powder coating, generally used with AC or direct current electrode positive (DCEP). So “18” is not one code for coating alone: the “1” gives position information, while “8” carries the coating and current details.

That distinction matters when choosing a rod for a joint overhead, vertical, or on a bench. E7018’s iron powder helps deposition, while its low-hydrogen coating supports welds where cracking risk needs careful control. It is not a cure-all. Damp or poorly stored electrodes can undermine that benefit, and handling requirements vary by product and procedure. Check the electrode’s technical sheet and the qualified welding procedure before use. A quick glance at the digits helps, but it does not replace preparation or sound technique.

Tips: Keep electrodes dry and follow the specified storage and exposure limits. Watch the arc and slag on a test bead; small changes in travel speed can affect the finish. Don’t guess.

Check AWS A5.1 Details: E7018 Uses Low-Hydrogen Iron-Powder Coating and AC or DCEP

AWS A5.1 decodes the E7018 designation one character at a time. “E” identifies a covered electrode, while “70” indicates a minimum tensile strength of 70,000 psi. The “1” means it is classified for all-position welding. The final “8” describes a low-hydrogen iron-powder coating and its current characteristics, including AC or DCEP operation.

That coating matters in practice. Low-hydrogen electrodes are often selected when weld metal needs careful control of hydrogen-related cracking risk. Iron powder supports higher deposition, so a steady bead can build efficiently. E7018 can run on AC or direct current electrode positive, also called DCEP. Still, machine settings, joint fit-up, and electrode condition affect the result. A damp coating is not a small detail.

Keep the electrodes dry according to the manufacturer’s instructions, and check the package data before welding. On a test plate, watch the arc start and bead profile; a rough start may point to technique, settings, or storage. The classification is useful, but it cannot replace a qualified welding procedure. Even experienced welders sometimes need another pass at tuning the setup.

How to Read AWS Classification for Welding Electrodes?

AWS A5.1 electrode classifications indicate minimum tensile strength. The chart compares the strength digits in four common classifications.

E7018: “E” means electrode; “70” indicates a minimum tensile strength of 70 ksi; “1” denotes all-position use; and “8” identifies a low-hydrogen, iron-powder coating. E7018 is designed for AC or DCEP.