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Filler metal product approval codes can seem like a foreign language. One thing is certain, and that is

each agency that establishes product approvals, such as AWS or ASME, does so to ensure filler metals

meet the requirements for which they are intended. Understanding the meaning behind each set of filler

metal product approvals will help you to better understand your filler metal's capabilities.

At one time or another you've probably browsed the contents of a filler metal specification sheet.

Listed, of course, is the standard dataavailable wire or electrode diameters, product characteristics,

features and benefits, operating parameters, and shielding gas requirements. In short, all the

information you need to weld properly with that filler metal.

Also listed is a section with a rather enigmatic title: "Conformances fand Approvals" (sometimes called

specifications).

In this section filler metal manufacturers list the product approvals that the wire or electrode bears

according to an agency such as the American Welding Society (AWS), American Society of

Mechanical Engineers (ASME), American Bureau of Shipping (ABS), Det Norske Veritas (DNV),

Lloyd's Register, or the Canadian Welding Bureau (CWB).

Gaining and listing a product approval from one of these regulatory agencies signifies the filler metal

manufacturer's commitment to quality and safety. It means its product is proven to yield specific

mechanical and chemical properties as needed for critical applications like structural steel erection,

shipbuilding, offshore platforms, and petrochemical piping.

Understanding the research, development, and testing that filler metals undergo to meet the

requirements of these agencies can be difficult, but knowing the basics of what the resulting product

approvals signify doesn't have to be.

Familiar Territory? A Look at AWS and Similar Product Approvals

AWS does not provide product approvals per se, but rather the agency sets forth standards to which

filler metals need to conform.

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To begin, AWS provides specifications for filler metals. A specification refers to a group of filler

metals that has been formulated for welding on a particular base material, such as AWS 5.20 (fully,

AWS 5.20/5.20M:2005), which is "Specifications for Carbon Steel Electrodes for Flux-Cored Arc

Welding." For every type of material, electrode, wire, and welding process, AWS sets forth similar

specifications.

Within each AWS specification are multiple AWS classifications, standards to which filler metalmanufacturers develop their products. Each classification bears an alphanumeric formula that

represents specific mechanical and chemical properties. The classification also provides important

information on how the filler metal should be used to ensure the stated weld properties are achieved.

For example, within the AWS A5.20 specification is a flux-cored wire with the AWS classification

E71T-1C H8. Following is a breakdown of each component of that classification:

E = Electrode

7 = Wire tensile strength measured in pounds per square inch (PSI); in this case, 70,000 PSI

The first 1 = All-position welding capability. (Note: 2 would indicate flat/horizontal welding position

capabilities)

T = Tubular wire, specifically, flux-cored. AWS uses a C to refer to metal-cored wires

The second 1 = Wire usability, including that this wire has a rutile slag system and operates on elec-

trode positive (DCEP)

C = Wire requires a CO2 shielding gas. (M would be listed for a wire that requires an argon/CO 2

shielding gas mixture)

H8 = How much diffusible hydrogen is in the weld metal. In this example, there is less than 8 ml of

hydrogen per 100 g of deposited weld metal (Note: The lower the number, the less hydrogen and the

lower the chance for hydrogen-induced cracking in the final weldment)

Labeling a filler metal with an AWS classification is the manufacturer's promise of quality. It means

that it has created a product that provides the weld properties its classification requires under

standardized test conditions. However, AWS does not inspect or witness testing.

An AWS classification is also a guideline that dictates filler metal selection for critical welding

applications. For instance, the AWS fabricating code D1.1 dictates the design and welding

requirements for structural steel. But it also determines acceptable filler metals for the job. By way of

example, the AWS A.520-specified E71T-1C H8 classification discussed thus far would be suitable for

certain applications under the AWS D1.1 code.

An example would be the welding of Group II steel, such as A572 grade 50, A36, or A992 used on

structural beam or column splices. It is generally the duty of the engineer of record or a certified

welding engineer involved with fabrication to obtain a certificate of conformance (also called a C of C

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or a typical cert) as evidence that a particular filler metal meets a certain specification and

classification.

AWS is not the only agency that requires filler metals to conform to certain properties. In fact, the

ASME uses nearly the same nomenclature for its product approvals. For example, the "Specifications

for Carbon Steel Electrodes for Flux-Cored Arc Welding," designated by AWS A.520, would be listed

under ASME standards as ASME SFA5.20. ASME also prescribes a set of fabricating codes thatdictate what filler metals are required for critical applications. Like AWS codes, these are designed to

ensure filler metal quality and the overall safety of the structure or components being welded.

Keeping Filler Metals Safe for Land and Sea

The ABS is an organization with the primary function of overseeing the production of marine vessels

and offshore platforms. However, it also governs product approvals for filler metals that are acceptable

to use on these applications.

For a filler metal manufacturer to obtain ABS product approval, it must regularly have its products

audited for quality, which includes an on-site visit to view production and to conduct weld testing.

Upon successful completion of that testing, ABS then certifies the product to what is called a grade.

For the previous AWS E71T-1C H8 flux-cored wire example, ABS could provide a product approval

of ABS Grade 2SAor 2YSA. Like AWS classifications, these grades can again be broken down

according to mechanical and chemical properties:

2 = Impact strength or toughness at a given temperature (also called Charpy V-notch). Here, that

temperature is -20 degrees C, or -4 degrees F (Note: A 3 would indicate -30 degrees C, or -22 degrees F

and a 4 would indicate -40 degrees C, or -40 degrees F)

SA = Wire can be used in a semi-automatic welding process. (Note: A semiautomatic approval also

encompasses an automatic welding process approval)

When present, Y indicates the filler metal provides high yield strength (over 50,000 PSI)

Similar to ABS are Lloyd's Register and DNV. Both agencies oversee shipbuilding, oil and gas

pipelines, and energy structures worldwide, as well as provide product approvals of filler metals for

these applications. Lloyd's especially tends to oversee product approvals for consumables used in

structures in Europe. DNV commonly oversees the development of platforms intended for the North

Sea and, with this construction, filler metals that are capable of producing welds to withstand the

extreme cold temperature of that water.

Lloyd's Register lists its product approvals using a similar system as ABS. As in the running example

of the AWS E71T-1C H8 filler metal, this wire could have Lloyd's approval of 3Y40S H10.

3 = Impact strength at a given temperature, which in this example is -30 degrees C, or -22 degrees F

Y40 = Tensile strength in megapascals (MPa), the metric version of PSI. Here it is 400 MPa

S = Wire is designed for semiautomatic welding

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H10 = Amount of diffusible hydrogen, in this case 10 ml per 100 g of weldment

A DNV product approval for this wire could be DVN II YMS, and the formula's breakdown is similar

to that of other agencies' formulas.

II = Impact strength at a given temperature, which here is -20 degrees C, or -4 degrees F

Y = Wire's high yield strength

M = Wire can be used for multirun welding

S = Wire can be used for semiautomatic applications

Like its American counterpart, the CWB has distinct requirements that must be met for a filler metal to

bear its product approval. That approval, like one from AWS, comes in the form of a classification.

CWB also provides specifications for families of filler metals, along with codes for fabrication and

filler metal selection.

A product approval or CWB classification for a carbon steel flux-cored wire similar to the previous

example could be labeled E491T-9 H8:

E = Electrode

49 = Tensile strength in MPa (in this case, 490 MPa, or about 70,000 PSI)

1 = Wire has all-position welding capabilities

T = Tubular wire

9 = Wire offers low-temperature impact values (to -30 degrees C, or -22 degrees F)

H8 = Wire has 8 ml of diffusible hydrogen per 100 g of weldment

Again, for a filler metal manufacturer to gain a product approval from CWB, its products must undergo

testing on a regular basis. CWB requires testing every two years, while some of the other agencies

require annual testing for a filler metal to continue bearing its product approval.

Whichever the testing frequency, the goal is the same: to ensure quality and safety. When the filler

metal you choose bears a specific product approval or states that it conforms to a particular standard,

you can be assured that it does.