ThePipingMart Blog Welding Electrodes AWS Class ER347 MIG & TIG Welding Wire – Composition, Properties, and Uses

AWS Class ER347 MIG & TIG Welding Wire – Composition, Properties, and Uses

AWS Class ER347 MIG & TIG

Welding is a crucial aspect of modern manufacturing and construction industries. AWS Class ER347 is a popular welding filler metal widely used for MIG and TIG welding applications. Whether you are a professional welder or learning to weld for the first time, it is essential to understand the composition, physical and mechanical properties, heat treatment, and corrosion resistance of AWS Class ER347 MIG & TIG welding. In this article, we will look in-depth at AWS Class ER347 and explore its various uses in welding.

What is AWS Class ER347 MIG & TIG Welding?

AWS Class ER347 is a type of filler metal that is used for welding austenitic and ferritic steels. It is a chromium-nickel-molybdenum alloy that contains small amounts of columbium and tantalum. The added columbium and tantalum help make the filler metal more resistant to intergranular corrosion and heat damage. This welding filler metal can be used in both MIG and TIG welding.

ER347 MIG & TIG Welding Wire Composition

AWS Class ER347 welding wire contains 19-21% chromium, 9-12% nickel, 0.75-1.50% columbium, and 0.75-1.50% tantalum. The balance is composed of iron and other trace elements. The added chromium, nickel, columbium, and tantalum provide the filler metal with superior corrosion resistance and enhanced strength, especially at high temperatures.

C Cr Ni Mo Mn Si P S Cu Element Amount
0.08 19.0-21.5 9.0-11.0 0.75 1.0-2.5 0.30-0.65 0.03 0.03 0.75 Nb 10XC min/1.0 max

ER347 MIG & TIG Coated Wire Physical Properties

AWS Class ER347 welding alloy has a density of approximately 7.98 g/cm3. It has a melting point of around 1640°C (2984°F), a thermal conductivity of 13.8 W/m⋅K at room temperature, and a coefficient of thermal expansion of around 16.5 µm/m⋅K at 20°C. Its electrical resistivity is around 72 µΩ-cm at room temperature.

ER347 MIG & TIG Welding Wire Mechanical Properties

AWS Class ER347 welding electrode  has excellent mechanical properties, including tensile strength, yield strength, elongation, and hardness. The filler metal can withstand high stress, fatigue, and corrosion. The tensile strength of AWS Class ER347 is around 620 MPa, with a yield strength of approximately 480 MPa. The elongation is around 35%, and the Brinell hardness is around 210.

Yield, kpsi: 57
Tensile Strength, kpsi: 86
Elongation%, min: 35

ER347 MIG & TIG Coated Wire Trade Names

Class UNS Oxford Alloys SANDVIK BOHLER UTP
ER347 S34780 Alloy 347 EXATON 19.9.NB/ EXATON 19.9.NBR (E347-17) BOHLER THERMAINT H – 347 UTP A68

ER347 MIG & TIG Welding Wire Parameters

Diameter Process Volt  

Amps

GAS
in (mm)
.035  (0.9) GMAW 22-23 180-210 Spray Transfer 98% Argon/2% Oxygen
.045  (1.14) GMAW 23-25 195-260 Spray Transfer 98% Argon/2% Oxygen
1/16” (1.6) GMAW 25-28 260-390 Spray Transfer 98% Argon/2% Oxygen
Diameter Process Volt  

Amps

GAS
in (mm)
 1/16”  (1.6) GTAW 14-18 90-130 100% Argon
 3/32”  (2.4) GTAW 15-20 120-175 100% Argon
 1/8”  (3.2) GTAW 15-20 150-220 100% Argon

ER347 MIG & TIG Coated Wire Uses

AWS Class ER347 filler wire is used for welding austenitic stainless steels and some ferritic stainless steels. It is commonly used in applications that require high corrosion resistance, high-temperature resistance, and low susceptibility to intergranular corrosion. Its typical applications include welding heat exchangers, power generation equipment, chemical processing plants, and food processing machinery. AWS Class ER347 is also used in the aerospace and medical industries.

ER347 MIG & TIG Welding Wire Heat Treatment

AWS Class ER347 filler metal can be heat treated to improve its mechanical properties. The welding filler metal can be annealed at 1050-1150°C (1922-2102°F) for 30 minutes per inch of thickness. The filler metal should then be air-cooled in an oven to avoid oxidation.

ER347 MIG & TIG Coated Wire Corrosion Resistance

AWS Class ER347 is extremely corrosion-resistant and can withstand various corrosive environments, including harsh chemicals, elevated temperatures, and saltwater. Its high chromium and nickel content provide excellent resistance to pitting, crevice corrosion, and stress corrosion cracking.

Conclusion

AWS Class ER347 MIG & TIG welding is a versatile and reliable welding filler metal with excellent corrosion resistance, mechanical properties, and heat resistance. Whether you are welding stainless steel for industrial applications or medical equipment, AWS Class ER347 is a popular choice. By understanding its composition, physical and mechanical properties, heat treatment, and corrosion resistance, you can make an informed decision when selecting filler metals for your welding projects.

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