AWS Class ERNiCr-3 filler wire is one of the welding industry’s most widely used filler materials due to its outstanding corrosion resistance. Made up of nickel, chromium, and molybdenum, it is an alloy that has gained popularity for its reliability in joining and repairing materials prone to corrosion. If you want to get the most out of AWS Class ERNiCr-3, this article provides a comprehensive guide to help you understand its composition, properties, uses, and more.
What is AWS Class ERNiCr-3?
AWS Class ERNiCr-3 is a welding alloy specifically designed for use with difficult-to-weld nickel alloys and other high-temperature alloys such as stainless steel, Inconel 601 and Hastelloy C. This alloy combines the advantages of NiCrMo (nickel chromium molybdenum) weld metals with enhanced levels of silicon and manganese to improve intergranular corrosion resistance. ERNiCr-3 resists heat and oxidation when exposed to temperatures from 1000°F up to 2300°F (540C – 1260C). Steel parts fabrications welded using class ERNiCr-3 are useful in applications requiring resistance to pitting, stress corrosion cracking, and crevice attack, even at high operating temperatures.
ERNiCr-3 Welding Rod Composition
The AWS Class ERNiCr-3 weld wire alloy comprises 65% Nickel, 20% Chromium, and 15% Molybdenum. It also contains small amounts of iron, manganese, silicon, and carbon. The high nickel content in this alloy provides superior protection against corrosion. While chromium enhances the alloy’s hardness and corrosion-resistant properties, molybdenum provides high-temperature strength and increased resistance to pitting corrosion.
| C | Mn | Fe | P | S | Si | Cu | Ni | Ti | Cr | Tb+Ta | Other |
| 0.10 | 2.5-3.5 | 3.0 | 0.03 | 0.015 | 0.50 | 0.50 | 67.0 min | 0.75 | 18.0-22.0 | 2.0-3.0 | 0.50 |
ERNiCr-3 Welding Rod Physical Properties
AWS Class ERNiCr-3 welding rod has high thermal and electrical conductivity, making it an excellent welding material. Its melting point is approximately 1,350°C, and its density is around 8.22g/cm³. This alloy has a specific heat capacity of 444j/kgK, a thermal expansion coefficient of 13.1×10^-6/K, and a thermal conductivity of 13.3 W/mK.
ERNiCr-3 Coated Rod Mechanical Properties
Mechanical properties of AWS Class ERNiCR-3 filler wire include its tensile strength, yield strength, and elongation. The tensile strength ranges between 610 MPa to 690 MPa, and the yield strength ranges between 295 MPa to 390 MPa, with the elongation at break ranging between 50% to 55%. AWS Class ERNiCr-3 also exhibits excellent ductility and toughness at room and high temperatures.
| Tensile Strength | 85,500 psi |
|---|---|
| Yield Strength | 52,500 psi |
| Elongation | 38% |
ERNiCr-3 Trade Names
| Class | UNS | Oxford Alloys | Special Metals | SANDVIK | BOHLER | UTP | ESAB |
| ERNiCr-3 | N06082 | Alloy 82 | INCONEL FILLER METAL 82 | EXATON NI 72HP | BOHLER THERMANIT NICRO 82 | UTP 068HH | OK TIGROD NICR-3 |
ERNiCr-3 Welding Wire Parameters
| Diameter | Process | Volt | Amps (flat) | Amps (V/OH) | |
| in | (mm) | ||||
| .035 | (0.9) | GMAW | 26-29 | 150-190 | Spray Transfer 100% Argon |
| .045 | (1.2) | GMAW | 28-32 | 180-220 | Spray Transfer 100% Argon |
| 1/16 | (1.6) | GMAW | 29-33 | 200-250 | Spray Transfer 100% Argon |
| 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 |
ERNiCr-3 Welding Rod Uses
AWS Class ERNiCr-3 is popular in welding applications, particularly in the aerospace, chemical, and petrochemical industries, due to its superior welding characteristics and corrosion resistance. It is commonly used for welding nickel-chromium alloys, stainless steel, and dissimilar metals as a filler material. It is used to install and repair chemical pressure vessels, air heat exchangers, and petroleum refining equipment.
ERNiCr-3 Welding Rod Heat Treatment
AWS Class ERNiCr-3 Filler wire does not require any heat treatment after welding since the welding process already causes the material to be annealed while producing it. However, some post-weld heat treatments can improve the mechanical properties of the alloy, such as hydrogen embrittlement relief.
ERNiCr-3 Welding wire Corrosion Resistance
One of the main reasons AWS Class ERNiCr-3 Welding Rod is preferred over other alloys for welding applications is its exceptional corrosion resistance properties. It can withstand harsh environments such as acid, detergents, and seawater. It also has good resistance to stress corrosion cracking, crevice, and pitting corrosion.
Conclusion
AWS Class ERNiCr-3 is a valuable filler material for welding various materials, particularly those prone to corrosion. Its composition, properties, and uses have made it a popular option in various industries, such as aerospace, chemical, and petrochemical. The alloy’s high nickel and chromium contents provide exceptional corrosion resistance, making it ideal for harsh environments. With the proper use, heat treatment, and maintenance, AWS Class ERNiCr-3 can offer a reliable and effective solution for welding and repairing corrosion-resistant materials.
A passionate metal industry expert and blogger. With over 5 years of experience in the field, Palak brings a wealth of knowledge and insight to her writing. Whether discussing the latest trends in the metal industry or sharing tips, she is dedicated to helping others succeed in the metal industry.
