ThePipingMart Blog Welding Electrodes AWS Class E9018-B3 Coated Electrodes – Composition, Properties, and Uses

AWS Class E9018-B3 Coated Electrodes – Composition, Properties, and Uses

AWS Class E9018-B3 Coated Electrodes

Welding is an essential part of the fabrication process in various industries. A reliable weld, from selecting the right electrode to the final heat treatment, ensures the quality and durability of the welded joint. AWS Class E9018-B3 coated electrodes are one of the most popular choices of electrodes used in this process. This blog post will discuss the composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance of AWS Class E9018-B3 coated electrodes.

What are AWS Class E9018-B3 Coated Electrodes?

AWS Class E9015-B9 Electrodes welding electrodes are a type of consumable electrode used to join similar and dissimilar metals together. These electrodes possess an iron or steel base alloys, which is then covered with a layer of flux composed of various materials such as silica, lime, calcium fluoride, manganese oxide and other ingredients. The coating increases the arc stability during welding processes to reduce spatter and protect welding joints from corrosion. This electrode type has excellent arc starting ability with a low-temperature transition, offering high efficiency in AC & DC applications. Additionally, it provides superior performance on stainless steel surfaces for improved weld bead appearances that require low heat input levels.

E9018-B3 Welding Electrodes Composition

AWS Class E9018-B3 welding alloy contain 3.5-4.5% chrome, 0.65-1% molybdenum, 0.4-0.7% nickel, and 0.015-0.03% carbon as the primary alloying elements. The coating comprises metallic oxides, cellulose and graphite, and titanium dioxide. The low-hydrogen coating composition and alloy content make these electrodes ideal for welding creep-resistant steels and high-temperature applications.

Weld Metal
Analysis (%)

AWS Spec

Carbon (C)

0.08 0.05-0.12

Chromium (Cr)

2.39 2.00-2.50

Manganese (Mn)


0.90 max

Molybdenum (Mo)

1.05 0.90-1.20

Phosphorous (P)


0.03 max

Silicon (Si)


0.80 max

Sulfur (S)


0.03 max

E9018-B3 Coated Electrodes Physical Properties

AWS Class E9018-B3 welding wire have a diameter range of 2.0-5.0mm and a length of 350mm/450mm. The electrodes have a stable arc, easy starting, and less spattering, making them easy to weld. The coating of the electrodes is highly resistant to moisture pickup, providing better arc stability and lower hydrogen embrittlement.

E9018-B3 Welding Electrodes Mechanical Properties

AWS Class E9018-B3 filler metal have excellent mechanical properties, including high tensile and yield strength. The electrodes have a 0.2% proof stress of 620-700N/mm^2, a tensile strength of 730-830N/mm^2, and an elongation of 19-25%. The low-temperature impact toughness of the welded joint is excellent, making it suitable for heavy-duty applications.

SR 1 Hr. @ 1275°F AWS Spec (min)

Ultimate Tensile Strength

109,000 psi (750 MPa) 90,000 psi

Yield Strength

93,000 psi (640 MPa) 77,000 psi

Percent Elongation in 2”

22% 17%

E9018-B3 Coated Welding Electrodes Trade Names

Class UNS Oxford Alloys BOHLER
E9018-B3 W53018 Alloy 9018-B3 BOHLER FOX P 22

E9018-B3 Welding Electrodes Parameters



Type of Power



Deposition Rate (lbs/hr)

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E9018-B3 Coated Electrodes Uses

AWS Class E9018-B3 filler wire find their application in various industries, including power generation, petrochemicals, and chemicals. They are used for welding heat-resistant steels like ASTM A335 P91, P92, and P122 and creep-resistant steels like ASTM A387 Gr.91 and Gr.11. The high-temperature strength and toughness of the welded joint make it ideal for critical applications, which require long-term performance.

E9018-B3 Coated Electrodes Heat Treatment

AWS Class E9018-B3 electrodes require post-weld heat treatment to achieve the desired mechanical properties and toughness. The heat treatment process involves a slow cooling rate, which allows the steel to dissolve the carbides and prevents martensite formation. The exact heat treatment process depends on the steel grade and thickness and the requirements specified by the end user.

E9018-B3 Welding Electrodes Corrosion Resistant

AWS Class E9018-B3 wire have excellent corrosion resistance in high-temperature and high-pressure environments. The chrome and molybdenum content of the alloy provides corrosion resistance against acidic and alkaline environments. The electrodes are also resistant to hydrogen sulfide and carbon dioxide, making them an ideal choice for oil and gas industries.


In conclusion, AWS Class E9018-B3 coated electrodes are reliable and popular for welding creep-resistant and heat-resistant steels. These electrodes’ composition, physical and mechanical properties, uses, heat treatment, and corrosion-resistant properties make them ideal for heavy-duty applications in various industries. However, using the correct welding parameters and following the recommended welding procedures is essential to achieve the desired results.

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