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625 Inconel welding rod is a high-performance filler material used primarily for joining or overlaying Inconel 625 alloy and other high-nickel alloys. Known for its excellent resistance to corrosion, oxidation, and extreme temperatures, this welding rod is widely used in demanding environments such as chemical processing, aerospace, marine, and nuclear industries. Inconel 625 welding rods are engineered to provide strong, ductile, and corrosion-resistant welds, making them ideal for fabricating components subjected to harsh operational conditions.
Chemical Composition of Inconel 625 Welding Rod
The chemical composition of Inconel 625 welding rod is designed to closely match the base metal. This ensures metallurgical compatibility and consistent mechanical properties after welding.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance (min. 58%) |
| Chromium (Cr) | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Iron (Fe) | ≤ 5.0 |
| Niobium + Tantalum (Nb + Ta) | 3.15 – 4.15 |
| Carbon (C) | ≤ 0.10 |
| Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.50 |
| Phosphorus (P) | ≤ 0.015 |
| Sulfur (S) | ≤ 0.015 |
Mechanical Properties of Weld Metal
The mechanical properties of welds made using Inconel 625 rods depend on the welding process and post-weld heat treatment, but the following values are typical:
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 760 MPa |
| Yield Strength (0.2% offset) | ≥ 400 MPa |
| Elongation | ≥ 30% |
| Hardness | ~200 HB |
Available Specifications and Standards
625 Inconel welding rods are produced under strict standards to ensure reliability in critical applications. Common specifications include:
| Standard | Description |
|---|---|
| AWS A5.14 | ERNiCrMo-3 (for GTAW/MIG welding) |
| AWS A5.11 | ENiCrMo-3 (for SMAW welding) |
| UNS Number | N06625 |
| Werkstoff Nr. | 2.4856 |
Applications of Inconel 625 Welding Rod
Inconel 625 welding rods are suitable for joining Inconel alloys, high-strength steels, stainless steels, and dissimilar metals. Typical applications include:
| Industry | Application |
|---|---|
| Chemical Processing | Reactors, tanks, pipe welds exposed to corrosive fluids |
| Aerospace | Engine components, turbine seals, exhaust ducts |
| Marine | Saltwater piping, submarine components |
| Oil & Gas | Cladding for downhole tools, offshore platforms |
| Nuclear | Containment vessels, control rods |
Welding Process Compatibility
625 Inconel welding rods are versatile and support various welding techniques, depending on the form:
| Welding Process | Rod Form | Typical Application |
|---|---|---|
| GTAW (TIG) | Wire (ERNiCrMo-3) | Precision welding of pipe, thin-walled tubing |
| GMAW (MIG) | Wire (ERNiCrMo-3) | Automated welding, large-area overlays |
| SMAW (Stick) | Rod (ENiCrMo-3) | Field work, structural welding |
| SAW | Wire + Flux | Heavy-section welding |
Storage and Handling Recommendations
To preserve the integrity of the welding rods and prevent contamination:
- Store rods in a dry, temperature-controlled environment (humidity < 60%)
- Keep rods in original sealed packaging until use
- Use gloves when handling to avoid oil or dirt contamination
- Do not bend or deform rods before use
Related Questions
What is the UNS designation for 625 Inconel welding rod?
The UNS designation is N06625, and the common AWS designations are ERNiCrMo-3 for wire and ENiCrMo-3 for stick rods.
What welding processes can be used with Inconel 625 welding rods?
Welding processes include TIG (GTAW), MIG (GMAW), Stick (SMAW), and SAW, depending on rod form and application.
What industries commonly use Inconel 625 welding rods?
Key industries include chemical processing, aerospace, marine, nuclear, and oil & gas due to the rod’s high corrosion and temperature resistance.