The Weld Star ER347Si Stainless Steel TIG Wire is a niobium-stabilised austenitic filler wire designed to resist intergranular chromium carbide precipitation, significantly improving resistance to intergranular corrosion. This makes it especially suitable for welding stainless steels that are stabilised with niobium or titanium, such as grades 321 and 347.
With increased silicon content to enhance weld pool fluidity, ER347Si produces smooth, well-shaped weld beads and excellent mechanical performance. It is commonly used in high-temperature service environments, particularly where components are subjected to intermittent heating between 400°C and 800°C, such as in chemical processing equipment, pressure vessels, and industrial plant fabrication.
Key Features
Niobium-Stabilised Austenitic Alloy: Prevents chromium carbide precipitation, improving resistance to intergranular corrosion.
High-Temperature Performance: Suitable for applications operating between 400 °C and 800 °C with intermittent heating cycles.
Smooth Weld Bead Appearance: Increased silicon content promotes good weld pool fluidity and clean deposit finish.
Ideal for Stabilised Stainless Steels: Designed for welding grades such as 321 and 347 stabilised with Nb or Ti.
Excellent Mechanical Strength: Provides reliable strength and ductility in demanding industrial environments.
Wide Industrial Application: Commonly used in chemical processing, pressure vessels, food, dairy, oil and textile industries.
Standards Compliance: EN ISO 14343-A – W 19 9 Nb Si | AWS A5.9 – ER 347Si.
Typical Chemical Composition (%): C: 0.020 | Mn: 1.74 | Si: 0.82 | S: 0.005 | P: 0.024 | Ni: 9.55 | Cr: 19.50 | Mo: 0.050 | Cu: 0.04 | Nb: 0.205.
Mechanical Properties (Typical): Tensile Strength: ≥550 MPa | Yield Strength: ≥350 MPa | Elongation: ≥25% | Impact Strength: ≥50 J (Values may vary depending on welding parameters, base material and shielding gas).
Shielding Gas: TIG – I1 (Argon) per EN ISO 14175.
Welding Positions: PA, PB, PC, PD, PE, PF, PG per EN ISO 6947.
Workshop-Friendly Packaging: Available in TIG diameters 1.60 mm, 2.40 mm and 3.20 mm, supplied in 5 kg packs with 1000 mm rod length for professional workshop and site use.
Download Product Specification.
