Inconel 625 welding rod is a high-performance nickel-chromium-molybdenum alloy filler metal designed for extreme environments requiring high corrosion resistance, high strength, and oxidation resistance. Manufacturers of Inconel 625 welding rods specialize in producing filler metals for aerospace, chemical processing, marine, and power generation applications, ensuring strict quality control, consistent composition, and reliable mechanical properties.
Overview of Inconel 625 Welding Rod
Inconel 625 welding rod, classified as ERNiCrMo-3, is suitable for joining nickel-based alloys and welding applications where high temperature strength and resistance to pitting and crevice corrosion are essential. Manufacturers provide rods in various diameters and packaging suitable for TIG, MIG, and other welding processes.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 58–63 |
| Chromium (Cr) | 20–23 |
| Molybdenum (Mo) | 8–10 |
| Iron (Fe) | ≤5 |
| Cobalt (Co) | ≤1 |
| Carbon (C) | ≤0.10 |
| Manganese (Mn) | ≤0.50 |
| Silicon (Si) | ≤0.50 |
| Niobium (Nb) | 3.15–4.15 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 750–850 MPa |
| Yield Strength | 350–450 MPa |
| Elongation | 35–45% |
| Hardness | 150–200 HV |
| Service Temperature | Up to 980°C |
Product Formats and Sizes
| Format | Diameter | Packaging |
|---|---|---|
| TIG Rod | 1.6 mm – 3.2 mm | 10 lb tube |
| MIG Wire | 0.8 mm – 2.4 mm | Spools 5–20 kg |
| SAW Wire | 4 mm – 10 mm | Coils 25–100 kg |
Applications
Inconel 625 welding rods are widely used in industries requiring corrosion resistance, high strength, and temperature stability:
1. Aerospace: Engine components and high-temperature structural joints.
2. Chemical Processing: Piping, tanks, and heat exchangers handling aggressive chemicals.
3. Marine: Seawater equipment and offshore structures.
4. Power Generation: Boilers, turbines, and nuclear components.
Manufacturing Process
Inconel 625 welding rods are manufactured using high-purity alloy production, melting, casting, extrusion, and drawing processes. Factories perform strict quality control including chemical analysis, mechanical testing, and inspection to ensure rods meet performance requirements.
| Process Step | Description |
|---|---|
| Melting | Vacuum induction melting ensures high purity and consistent composition. |
| Casting | Forms billets for rod drawing and extrusion. |
| Extrusion / Drawing | Reduces rod to precise diameter and surface finish. |
| Heat Treatment | Relieves stress and stabilizes microstructure. |
| Testing & Inspection | Chemical composition and mechanical property verification. |
Packing and Delivery
Finished welding rods are packed with anti-rust coating or plastic tubes, often in wooden crates, to protect during transport. Factories provide options for bulk orders and international shipping with complete documentation and batch traceability.
Related Questions
1. What are the common diameters for Inconel 625 welding rods?
Typical diameters range from 1.6 mm to 3.2 mm for TIG rods, 0.8 mm to 2.4 mm for MIG wire, and 4 mm to 10 mm for SAW wire.
2. Can Inconel 625 welding rod be used for dissimilar metal welding?
Yes, it is suitable for joining nickel-based alloys to each other and to stainless steel, providing excellent corrosion resistance and strength at high temperatures.
3. Why choose a certified manufacturer for Inconel 625 welding rods?
Certified manufacturers ensure consistent chemical composition, mechanical properties, proper documentation, and compliance with industrial standards, reducing risk in critical applications.
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