AWS A5.6 / A5.6M: The Complete Classification Guide for Copper and Copper-Alloy Covered Electrodes
What Is AWS A5.6 / A5.6M and What Does It Cover?
AWS A5.6/A5.6M is the American Welding Society specification titled "Specification for Copper and Copper-Alloy Electrodes for Shielded Metal Arc Welding."
It prescribes the requirements for classification of covered copper and copper-alloy electrodes used with the shielded metal arc welding (SMAW) process, commonly known as stick welding.
The specification covers compositions in which the copper content exceeds that of any other element.
Classification is based on chemical composition, mechanical properties, and usability of the electrodes.
Additional requirements are included for manufacture, sizes, lengths, and packaging.
The current edition is AWS A5.6/A5.6M:2026, the 10th edition, which revises AWS A5.6/A5.6M:2008 (R2017).
The specification makes use of both U.S. Customary Units and the International System of Units, with each system to be used independently.
The specification is also adopted as ASME SFA-5.6 and appears in Section II, Part C of the ASME Boiler and Pressure Vessel Code.
No attempt has been made to provide for the classification of all grades of copper and copper-alloy welding electrodes; only the more commonly used grades have been included.
Always verify specific classification requirements with the latest edition of A5.6/A5.6M.
What is the scope of AWS A5.6/A5.6M?
AWS A5.6/A5.6M covers covered copper and copper-alloy electrodes for shielded metal arc welding.
The specification includes electrodes for welding copper to copper, copper to steel, copper to cast iron, and for surfacing and buildup applications.
The covered electrodes are classified on the basis of the chemical composition of the undiluted weld metal, as specified in the standard's composition tables.
Material classified under one classification shall not be classified under any other classification in this specification.
For bare copper and copper-alloy welding rods and electrodes used with gas shielded processes, the applicable standard is AWS A5.7/A5.7M.
How does AWS A5.6 differ from AWS A5.7?
AWS A5.6 and AWS A5.7 are complementary standards covering different product forms of copper and copper-alloy filler metals.
AWS A5.6 covers covered (flux coated) electrodes for the shielded metal arc welding process, where the flux coating is integral to the electrode and provides shielding and slag formation.
AWS A5.7 covers bare copper and copper-alloy welding rods and electrodes for gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and oxyfuel gas welding (OFW).
The product forms differ fundamentally: A5.6 electrodes are coated stick electrodes with an "E" prefix, while A5.7 products are bare wires and rods with an "ER" or "R" prefix.
Some alloy compositions, such as ECuMnNiAl and ERCuMnNiAl, appear in both specifications but with different product forms and welding process applicability.
How Are AWS A5.6 Electrodes Classified?
AWS A5.6 copper and copper-alloy covered electrodes are classified using an alphanumeric system that begins with the letter "E" for electrode, followed by the chemical symbol "Cu" for copper.
A suffix letter or letter combination then identifies the principal alloying element or elements, such as "Si" for silicon, "Sn" for tin, "Ni" for nickel, "Al" for aluminum, or "MnNiAl" for manganese-nickel-aluminum.
Additional letters or numbers further distinguish specific composition variants within an alloy family, such as ECuSn-A and ECuSn-C, or ECuAl-A1 and ECuAl-A2.
All classifications share a common designation structure that conveys the alloy type and, in some cases, the specific composition range.
The classification system is designed to allow users to quickly identify the general alloy family and select an electrode appropriate for the base metal and service conditions.
What does the "E" prefix mean in AWS A5.6 classifications?
The "E" prefix stands for electrode, indicating that the product is a covered electrode for the shielded metal arc welding process.
This prefix distinguishes A5.6 classifications from the bare wire and rod classifications in AWS A5.7, which use the "ER" or "R" prefix.
All classifications in AWS A5.6 begin with the letter E, followed by the chemical symbol Cu for copper.
What do the alloy suffixes mean?
The alloy suffixes in AWS A5.6 classifications identify the principal alloying elements beyond copper.
ECu is unalloyed copper.
ECuSi contains silicon as the principal alloying addition, producing a silicon bronze deposit.
ECuSn-A and ECuSn-C contain tin as the principal alloying addition, producing phosphor bronze deposits with different tin levels.
ECuNi contains nickel as the principal alloying addition, producing a copper-nickel deposit.
ECuAl-A2 and ECuAl-B contain aluminum as the principal alloying addition, producing aluminum bronze deposits with different aluminum levels.
ECuNiAl contains nickel and aluminum, producing a nickel-aluminum bronze deposit.
ECuMnNiAl contains manganese, nickel, and aluminum, producing a manganese-nickel-aluminum bronze deposit with very high strength.
What Is the Complete List of AWS A5.6 / A5.6M Types?
The AWS A5.6/A5.6M classification list comprises nine standard classifications covering unalloyed copper, silicon bronze, phosphor bronze, copper-nickel, and aluminum bronze alloy families.
The complete list of standard classifications is ECu, ECuSi, ECuSn-A, ECuSn-C, ECuNi, ECuAl-A2, ECuAl-B, ECuNiAl, and ECuMnNiAl.
Each classification corresponds to a specific alloy system and range of chemical composition.
Some classifications may also be available in a general (G) form, such as ECuNiAl-G or ECuMnNiAl-G, where the composition is agreed between supplier and purchaser.
For the complete and authoritative list of classifications, always verify with the latest edition of A5.6/A5.6M.
Which standard classifications are included in AWS A5.6?
The standard classifications in AWS A5.6 are ECu, ECuSi, ECuSn-A, ECuSn-C, ECuNi, ECuAl-A2, ECuAl-B, ECuNiAl, and ECuMnNiAl.
ECu is unalloyed copper with a minimum copper content of 98.00%, used for welding pure copper and for electrical conductivity applications.
ECuSi is a silicon bronze with 2.4% to 4.0% silicon, used for welding copper-silicon alloys and for corrosion-resistant overlays.
ECuSn-A is a phosphor bronze with 4.0% to 6.0% tin, used for welding copper-tin alloys and for bearing surfaces.
ECuSn-C is a phosphor bronze with 7.0% to 9.0% tin, used for welding higher-tin bronzes and for wear-resistant overlays.
ECuNi is a copper-nickel alloy with 29.0% to 33.0% nickel, used for welding copper-nickel alloys in seawater applications.
ECuAl-A2 is an aluminum bronze with 6.5% to 9.5% aluminum, used for welding aluminum bronze and for corrosion-resistant overlays.
ECuAl-B is an aluminum bronze with 9.5% to 11.5% aluminum, used for higher-strength aluminum bronze welding and overlays.
ECuNiAl is a nickel-aluminum bronze with 8.0% to 9.5% aluminum and 4.0% to 6.0% nickel, used for welding nickel-aluminum bronze castings and for seawater components.
ECuMnNiAl is a manganese-nickel-aluminum bronze with 11.0% to 14.0% manganese, 1.5% to 3.0% nickel, and 6.0% to 8.5% aluminum, used for the highest-strength copper-alloy welding and surfacing applications.
Are there G-classified electrodes in AWS A5.6?
Some AWS A5.6 classifications may be available in a general (G) form, such as ECuNiAl-G or ECuMnNiAl-G, where the chemical composition is not fully specified by the standard and is instead agreed between supplier and purchaser.
The "G" suffix indicates that the electrode meets the mechanical property and usability requirements but the exact alloy content is controlled by the manufacturer's specification.
G-classified electrodes provide flexibility for proprietary formulations and application-specific requirements.
For the availability and exact composition of G-classified electrodes, verify with the manufacturer's datasheet and the latest edition of A5.6/A5.6M.
What Are the Key Parameters of Each AWS A5.6 Classification?
What is ECu?
ECu is an unalloyed copper covered electrode designed for welding pure copper, deoxidized copper, and oxygen-free copper base metals.
Its typical deposited weld metal chemistry includes copper at a minimum of 98.00%, with silicon at a maximum of 0.50%, tin at a maximum of 1.00%, phosphorus at a maximum of 0.15%, manganese at a maximum of 0.50%, and other elements at a maximum of 0.50% total.
The minimum tensile strength is 25,000 psi (170 MPa), with a minimum elongation of 20%.
Typical mechanical properties in the as-welded condition include tensile strength of approximately 32,000 psi (220 MPa), yield strength of 27,000 psi (185 MPa), elongation of 32% to 35%, and Brinell hardness of 50–60 HB.
ECu is welded with DC electrode positive (DC+) or AC and is suitable for flat, horizontal, vertical, and overhead positions.
Preheating thicker sections to 750°F to 1100°F (400°C to 600°C) is recommended.
Typical applications include welding pure copper components, repairing electrical conductivity parts such as electrode holders and flanges, overlaying steel, and joining heavier sections of copper to steel.
Common trade names include Nihonweld N-Cu, Selectrode 1281, and Dayang ECu.
What is ECuSi?
ECuSi is a silicon bronze covered electrode designed for welding copper-silicon alloys and for surfacing applications requiring corrosion resistance.
Its typical deposited weld metal chemistry includes silicon at 2.4% to 4.0%, manganese at a maximum of 1.5%, iron at a maximum of 0.50%, and copper as the balance.
The minimum tensile strength is 50,000 psi (340 MPa), with a minimum elongation of 20%.
ECuSi produces a weld deposit with good corrosion resistance and moderate strength, suitable for welding copper-silicon alloys such as Everdur.
Typical applications include welding silicon bronze castings and wrought components, and surfacing for corrosion resistance in marine and chemical environments.
Common trade names include CEWELD E CuSi and Certilas SiBz.
What is ECuSn-A?
ECuSn-A is a phosphor bronze covered electrode with a moderate tin content, designed for welding copper-tin alloys and for bearing and wear-resistant applications.
Its typical deposited weld metal chemistry includes tin at 4.0% to 6.0%, phosphorus at 0.05% to 0.35%, iron at a maximum of 0.25%, and copper as the balance.
The minimum tensile strength is 35,000 psi (240 MPa), with a minimum elongation of 20%.
Typical mechanical properties in the as-welded condition include tensile strength of approximately 61,000 psi (424 MPa), yield strength of 36,000 psi (250 MPa), and Brinell hardness of 65–75 HB.
ECuSn-A is used for welding and surfacing copper-tin alloys, bronzes, and brasses, and for bearing surfaces and pump components.
Common trade names include Nihonweld N-CuSn-A and Tensileweld ECuSn-A.
What is ECuSn-C?
ECuSn-C is a phosphor bronze covered electrode with a higher tin content than ECuSn-A, designed for welding higher-tin bronzes and for wear-resistant overlays.
Its typical deposited weld metal chemistry includes tin at 7.0% to 9.0%, phosphorus at 0.05% to 0.35%, iron at a maximum of 0.25%, and copper as the balance.
The minimum tensile strength is 40,000 psi (275 MPa), with a minimum elongation of 20%.
ECuSn-C produces a harder deposit than ECuSn-A, with better resistance to wear and galling.
Typical applications include welding and surfacing of phosphor bronze and leaded bronze components, bearing surfaces, worm gears, and pump parts.
Common trade names include Magmaweld ECuSn7, CEWELD E ZIBRO, and Hyundai S-CuSn C.
What is ECuNi?
ECuNi is a copper-nickel covered electrode designed for welding copper-nickel alloys and for applications requiring resistance to seawater corrosion and cavitation.
Its typical deposited weld metal chemistry includes nickel plus cobalt at 29.0% to 33.0%, manganese at 1.00% to 2.50%, iron at 0.40% to 0.75%, silicon at a maximum of 0.50%, titanium at a maximum of 0.50%, and copper as the balance.
The minimum tensile strength is 50,000 psi (340 MPa), with a minimum elongation of 20%.
Typical mechanical properties in the as-welded condition include tensile strength of approximately 52,000 psi (360 MPa) and elongation of 23%.
ECuNi produces a 70% Cu-30% Ni deposit with excellent resistance to seawater corrosion, erosion, and cavitation.
Typical applications include welding 70/30 and 90/10 copper-nickel alloys, cladding copper-nickel clad steels, and fabricating seawater piping, heat exchangers, and marine components.
Common trade names include Lincoln Tech-Rod 187, Nihonweld N-CuNi, and Washington Alloy 187.
What is ECuAl-A2?
ECuAl-A2 is an aluminum bronze covered electrode designed for welding aluminum bronze alloys and for surfacing applications requiring corrosion and wear resistance.
Its typical deposited weld metal chemistry includes aluminum at 6.5% to 9.5%, iron at 0.50% to 5.0%, silicon at a maximum of 1.5%, and copper as the balance.
The minimum tensile strength is 60,000 psi (410 MPa), with a minimum elongation of 20%.
Typical mechanical properties include tensile strength of approximately 89,000 psi (614 MPa), yield strength of 59,000 psi (407 MPa), and hardness of approximately 130 HB.
ECuAl-A2 is welded with DC electrode positive (DC+) and is suitable for welding aluminum bronze castings and wrought components.
Typical applications include welding aluminum bronze castings, pump components, valves, and overlays on steel for corrosion and wear resistance in seawater.
Common trade names include Nihonweld N-CuAl-A2, Selectrode 1285, and CEWELD E CuAl8.
What is ECuAl-B?
ECuAl-B is a higher-aluminum aluminum bronze covered electrode designed for welding higher-strength aluminum bronze alloys and for wear-resistant overlays.
Its typical deposited weld metal chemistry includes aluminum at 9.5% to 11.5%, iron at 2.5% to 5.0%, silicon at a maximum of 1.50%, and copper as the balance.
The minimum tensile strength is 65,000 psi (450 MPa), with a minimum elongation of 20%.
ECuAl-B produces a harder and stronger deposit than ECuAl-A2, with nominal hardness of approximately 160 Brinell.
Typical applications include welding and surfacing of aluminum bronze components requiring high strength and wear resistance, acid and seawater-resistant overlays, and bearing surfaces.
Common trade names include AMPCO-TRODE 160 and Nihonweld N-CuAl-B.
What is ECuNiAl?
ECuNiAl is a nickel-aluminum bronze covered electrode designed for welding nickel-aluminum bronze castings and for applications requiring high resistance to corrosion, erosion, and cavitation.
Its typical deposited weld metal chemistry includes aluminum at 8.0% to 9.5%, nickel at 4.0% to 6.0%, iron at 3.0% to 6.0%, manganese at 0.50% to 3.5%, and copper as the balance.
The minimum tensile strength is 72,000 psi (500 MPa), with a minimum elongation of 10%.
Typical mechanical properties include tensile strength of approximately 90,000 to 95,000 psi (620–655 MPa), yield strength of 45,000 to 56,000 psi (310–386 MPa), and hardness of 160–200 HB.
ECuNiAl is particularly suitable for welding cast ship propellers conforming to MIL-B-21230 Alloy 2, marine components, and for joining dissimilar metals.
Common trade names include AMPCO-TRODE 46 and Nihonweld N-CuNiAl.
What is ECuMnNiAl?
ECuMnNiAl is a manganese-nickel-aluminum bronze covered electrode designed for the most demanding copper-alloy welding and surfacing applications.
Its typical deposited weld metal chemistry includes manganese at 11.0% to 14.0%, aluminum at 6.0% to 8.5%, nickel at 1.5% to 3.0%, iron at 2.0% to 4.0%, silicon at a maximum of 1.5%, and copper as the balance.
The minimum tensile strength is 75,000 psi (520 MPa), with a minimum elongation of 15%.
Typical mechanical properties in the as-welded condition include tensile strength of approximately 95,000 psi (655 MPa), yield strength of 56,000 psi (386 MPa), elongation of 27%, and hardness of approximately 185 HB.
ECuMnNiAl provides the highest strength and hardness among the AWS A5.6 classifications, along with excellent resistance to corrosion, erosion, and cavitation.
Typical applications include welding cast ship propellers conforming to MIL-B-21230 Alloy 2, marine components, joining dissimilar metals, and overlays on cast iron and steel.
Common trade names include AMPCO-TRODE 40 and UTP 34 N.
What Are the Mechanical Properties of AWS A5.6 Electrodes?
The mechanical properties of AWS A5.6 electrodes are determined through tensile tests of the all-weld metal.
The tensile strength requirements range from 25,000 psi for ECu to 75,000 psi for ECuMnNiAl, reflecting the different alloy systems and their strengthening mechanisms.
Yield strength requirements are specified as minimum values for most classifications.
Elongation requirements ensure adequate ductility for the intended applications.
The exact mechanical property requirements for each classification should be verified with the latest edition of A5.6/A5.6M.
What tensile strength is required for each AWS A5.6 classification?
The minimum tensile strength requirements for AWS A5.6 classifications are as follows.
ECu requires a minimum of 25,000 psi (170 MPa).
ECuSi requires a minimum of 50,000 psi (340 MPa).
ECuSn-A requires a minimum of 35,000 psi (240 MPa).
ECuSn-C requires a minimum of 40,000 psi (275 MPa).
ECuNi requires a minimum of 50,000 psi (340 MPa).
ECuAl-A2 requires a minimum of 60,000 psi (410 MPa).
ECuAl-B requires a minimum of 65,000 psi (450 MPa).
ECuNiAl requires a minimum of 72,000 psi (500 MPa).
ECuMnNiAl requires a minimum of 75,000 psi (520 MPa).
These values should be verified with the manufacturer's datasheet and the latest edition of A5.6/A5.6M.
What elongation is required for AWS A5.6 electrodes?
Elongation requirements for AWS A5.6 electrodes ensure that the weld metal has adequate ductility for the intended applications.
ECu requires a minimum elongation of 20%.
ECuSi requires a minimum elongation of 20%.
ECuSn-A requires a minimum elongation of 20%.
ECuSn-C requires a minimum elongation of 20%.
ECuNi requires a minimum elongation of 20%.
ECuAl-A2 requires a minimum elongation of 20%.
ECuAl-B requires a minimum elongation of 20%.
ECuNiAl requires a minimum elongation of 10%, reflecting the higher strength and lower ductility of this alloy.
ECuMnNiAl requires a minimum elongation of 15%.
These values should be verified with the manufacturer's datasheet and the latest edition of A5.6/A5.6M.
What Are the Typical Applications for Each AWS A5.6 Classification?
The application profiles of AWS A5.6 electrodes reflect their respective alloy systems and performance characteristics.
ECu is used for pure copper welding and electrical conductivity applications.
ECuSi is used for welding copper-silicon alloys and corrosion-resistant overlays.
ECuSn-A and ECuSn-C are used for phosphor bronze welding and bearing applications.
ECuNi is used for copper-nickel welding in seawater environments.
ECuAl-A2 and ECuAl-B are used for aluminum bronze welding and surfacing.
ECuNiAl and ECuMnNiAl are used for nickel-aluminum bronze and manganese-nickel-aluminum bronze applications requiring the highest strength and corrosion resistance.
Understanding the operating conditions and requirements of the component is essential for selecting the appropriate classification.
What components are typically welded with ECu and ECuSi?
ECu is used for welding pure copper components such as bus bars, electrical conductors, and chemical processing equipment.
It is also used for repairing electrical conductivity parts such as electrode holders and flanges, overlaying steel, and joining heavier sections of copper to steel.
ECuSi is used for welding silicon bronze castings and wrought components, such as Everdur pumps and valves, and for surfacing applications requiring corrosion resistance in marine and chemical environments.
What components are typically welded with ECuSn-A and ECuSn-C?
ECuSn-A is used for welding and surfacing copper-tin alloys, bronzes, and brasses, and for bearing surfaces and pump components.
ECuSn-C is used for welding and surfacing of phosphor bronze and leaded bronze components, bearing surfaces, worm gears, and pump parts requiring higher wear resistance.
Both classifications are used in marine, pump, and machinery applications where resistance to wear and corrosion is required.
What components are typically welded with ECuNi?
ECuNi is used for welding 70/30 and 90/10 copper-nickel alloys in seawater piping, heat exchangers, condensers, and marine components.
It is also used for cladding copper-nickel clad steels and for joining copper-nickel to steel and other alloys.
The 70% Cu-30% Ni deposit provides excellent resistance to seawater corrosion, erosion, and cavitation.
What components are typically welded with ECuAl-A2 and ECuAl-B?
ECuAl-A2 and ECuAl-B are used for welding aluminum bronze castings and wrought components in pumps, valves, and seawater handling equipment.
They are also used for overlays on steel for corrosion and wear resistance in marine and chemical environments.
ECuAl-B provides higher hardness and strength than ECuAl-A2, making it suitable for more demanding wear applications.
What components are typically welded with ECuNiAl and ECuMnNiAl?
ECuNiAl is used for welding nickel-aluminum bronze castings, particularly cast ship propellers conforming to MIL-B-21230 Alloy 2, marine components, and for joining dissimilar metals.
ECuMnNiAl is used for welding manganese-nickel-aluminum bronze components and for the most demanding marine and industrial applications requiring the highest strength, hardness, and corrosion resistance.
Both classifications are commonly used in shipbuilding, offshore, and heavy machinery applications.
How Do I Choose the Right AWS A5.6 Electrode?
Selecting the right AWS A5.6 electrode depends on the base metal composition, the required mechanical properties, the corrosion resistance requirements, and the welding position.
The first step is to identify the base metal alloy and select a matching or near-matching electrode classification.
For pure copper, ECu is appropriate; for silicon bronze, ECuSi; for phosphor bronze, ECuSn-A or ECuSn-C; for copper-nickel, ECuNi; for aluminum bronze, ECuAl-A2 or ECuAl-B; and for nickel-aluminum bronze or manganese-nickel-aluminum bronze, ECuNiAl or ECuMnNiAl.
The second step is to consider the required strength and hardness: ECu provides the lowest strength, while ECuMnNiAl provides the highest.
The third step is to consider the corrosion environment: ECuNi, ECuNiAl, and ECuMnNiAl offer the best seawater corrosion resistance.
The fourth step is to verify the welding position capability and current requirements, which vary by classification.
Always verify the electrode selection with the applicable code requirements and the manufacturer's recommendations.
What is the decision framework for selecting an AWS A5.6 electrode?
The first step is to determine the base metal composition and select the matching electrode family.
If the base metal is pure copper, ECu is the appropriate choice.
If the base metal is copper-nickel, ECuNi is appropriate.
If the base metal is aluminum bronze, ECuAl-A2 or ECuAl-B is appropriate, depending on the required strength and hardness.
If the base metal is nickel-aluminum bronze or manganese-nickel-aluminum bronze, ECuNiAl or ECuMnNiAl is appropriate.
The second step is to consider the service environment: for seawater applications, the nickel-bearing classifications (ECuNi, ECuNiAl, ECuMnNiAl) are preferred.
The third step is to verify the availability of the electrode in the required diameter and the recommended welding parameters for the specific application.
What are the ASME F-Number and A-Number designations for AWS A5.6 electrodes?
The ASME F-Number is a grouping of filler metals based on their welding characteristics and usability, used in welding procedure qualification under ASME Section IX.
Most copper and copper-alloy electrodes are grouped under F-Number 21 or F-Number 22, depending on the specific alloy and its welding characteristics.
The A-Number is a grouping based on the chemical composition of the deposited weld metal, used for procedure qualification of ferrous materials.
For copper and copper-alloy electrodes, the A-Number may not be directly applicable in the same way as for ferrous materials.
The exact F-Number and A-Number assignments should be verified with the latest edition of ASME Section IX and the manufacturer's datasheet.
AWS A5.6 is part of a broader family of AWS filler metal specifications for copper, nickel, and other non-ferrous materials.
Understanding these related standards helps ensure that the correct specification is applied for each welding process and base metal.
The main related standards are A5.7, A5.13, A5.15, and A5.27.
Each covers different product forms, alloy systems, or welding processes.
What is AWS A5.7/A5.7M?
AWS A5.7/A5.7M covers copper and copper-alloy bare welding rods and electrodes for gas tungsten arc welding, gas metal arc welding, and oxyfuel gas welding.
The specification includes classifications such as ERCu, ERCuSi-A, ERCuSn-A, ERCuNi, ERCuAl-A2, ERCuNiAl, and ERCuMnNiAl, which correspond to many of the covered electrode classifications in A5.6.
These bare wires and rods are used for semi-automatic and automatic welding processes, while A5.6 covered electrodes are used for manual stick welding.
Verify with the latest edition for current classifications.
What is AWS A5.13/A5.13M?
AWS A5.13/A5.13M covers surfacing electrodes for shielded metal arc welding, including cobalt-based, nickel-based, iron-based, and copper-based hardfacing electrodes.
Some copper-alloy hardfacing electrodes may be classified under both A5.6 and A5.13, depending on their intended application as welding or surfacing consumables.
Verify with the latest edition for current classifications.
What is AWS A5.15?
AWS A5.15 covers welding electrodes and rods for cast iron.
The specification includes classifications such as ENi-CI, ENiFe-CI, and ESt, which are used for welding cast iron components.
Some copper-alloy electrodes, particularly ECuMnNiAl, are used for welding cast iron as a nickel-free alternative to nickel-based electrodes.
Verify with the latest edition for current classifications.
What is ISO 17777 and how does it relate to AWS A5.6?
ISO 17777 is the international standard for covered electrodes for manual metal arc welding of copper and copper alloys.
The ISO 17777 classification system uses a different designation structure than AWS A5.6, but many products carry dual classifications under both systems.
For example, ECuNi under AWS A5.6 corresponds to E Cu 7158 (CuNi30Mn2FeTi) under EN ISO 17777.
ECuSn-C corresponds to E Cu 5180B under EN ISO 17777.
The correspondence is product-specific and should be verified with the manufacturer's datasheet and the latest editions of both standards.
What is ASME SFA-5.6?
ASME SFA-5.6 is the ASME adoption of AWS A5.6 and is published in Section II, Part C of the ASME Boiler and Pressure Vessel Code.
The classification requirements, chemical composition limits, and mechanical property requirements are identical to those in AWS A5.6.
When a project is governed by ASME codes, the SFA-5.6 designation is used instead of the AWS A5.6 designation, but the technical content is the same.
Always verify with the latest edition of ASME SFA-5.6 or AWS A5.6/A5.6M for current requirements.
Where Can I Find the Official Complete List of AWS A5.6 / A5.6M Types?
The authoritative source for the complete list of AWS A5.6/A5.6M classifications is the latest edition of the specification itself, available from the American Welding Society at pubs.aws.org or through authorized standards distributors such as ANSI.
The specification includes detailed tables covering chemical composition requirements, mechanical property minimums, standard sizes, and packaging requirements for every classification.
Manufacturer technical datasheets and welding consumable catalogs also list AWS A5.6 classifications, but these should be cross-referenced against the official specification for accuracy.
Because classifications may be added or revised with each edition, always verify with the latest A5.6/A5.6M edition to ensure your electrode selection aligns with the current classification list.
