About ER 347 Mig Wire

ER 347 MIG wire is a solid stainless steel filler metal designed for welding stabilized austenitic stainless steels like 321 and 347. It offers excellent resistance to intergranular corrosion and high-temperature properties, making it suitable for applications in the aerospace, chemical, and petrochemical industries.

ER 347 Mig Wire Chemical Compositions:

The typical chemical composition of ER 347 MIG wire includes:-

  • Carbon (C): 0.08% max
  • Silicon (Si): 0.75% max
  • Manganese (Mn): 2.0% max
  • Phosphorus (P): 0.045% max
  • Sulphur (S): 0.03% max
  • Chromium (Cr): 17.0-20.0%
  • Nickel (Ni): 9.0-13.0%
  • Columbium (Niobium) + Tantalum (Cb+Ta): 10xC – 1.10%
  • Iron (Fe): Balance

These elements contribute to its weldability and corrosion resistance, crucial for welding applications.

ER 347 Mig Wire Physical Properties:

  • Density: Typically around 7.9 g/cm³, providing insight into mass per unit volume.
  • Melting Point: Approximately 1400-1450°C (2552-2642°F), indicating solid to liquid transition temperature.
  • Electrical Conductivity: Moderate, suitable for welding applications.
  • Thermal Conductivity: High, facilitating efficient heat transfer during welding.
  • Ductility: Exhibits good ductility, allowing for flexibility in welding applications.
  • Magnetic Properties: Typically non-magnetic in the annealed condition, minimizing interference.
  • Corrosion Resistance: Offers excellent resistance to corrosion, maintaining weld integrity in various environments.

ER 347 Mig Wire Mechanical Properties:

  • Tensile Strength: Typically ranges from 550 to 750 MPa, indicating maximum load capacity before breaking.
  • Yield Strength: Typically around 280 to 400 MPa, representing the stress level for permanent deformation onset.
  • Elongation: Usually between 35% to 45%, showing the ability to stretch without breaking.
  • Hardness: Varies based on welding conditions and heat treatment.
  • Impact Toughness: Reflects the ability to absorb energy during impact without fracturing.
  • Fatigue Strength: Indicates resistance to failure under repeated loading.
  • Microstructure: Typically austenitic, contributing to corrosion resistance and mechanical properties.

ER 347 Mig Wire Applications:

  • Aerospace Industry: Used for welding components in aircraft and spacecraft due to its high-temperature stability and corrosion resistance.
  • Chemical Processing: Fabricating equipment and pipelines in chemical plants where corrosion resistance is crucial.
  • Power Generation: Welding components for power plants, ensuring strength and corrosion resistance.
  • Oil and Gas Industry: Utilized in welding applications for pipelines and equipment in harsh environments.
  • Food Processing: Welding equipment and machinery in the food industry requiring corrosion resistance and cleanliness.
  • Automotive Industry: Welding stainless steel parts in automotive manufacturing, including exhaust systems and engine components.
  • Heat Exchangers: Used in the fabrication of heat exchangers due to its corrosion resistance and thermal stability.