SIST EN 4326:2002

Overview

SIST EN 4326:2002 defines the requirements for the heat resisting alloy CO-WH4102 (CoCr28W20Ni5V1) as a filler metal, supplied in wire and rod form, for use in welding within the aerospace industry. This Slovenian and European standard ensures consistent quality and performance for filler materials specified for aerospace applications, particularly where high temperature and mechanical strength are critical. The alloy is intended for manufacturing pre-forms used in further production processes.

Key Topics

• Material Composition
  • Specifies alloy CO-WH4102 (base elements: cobalt, chromium, tungsten, nickel, vanadium).
• Product Form
  • Wire and rod formats suitable for use as welding filler metal.
• Manufacturing Methods
  • Cast, extruded, or air-melted processes to achieve required product forms.
• Heat Resisting Capability
  • Designed for applications requiring strength and stability under elevated temperatures.
• Aerospace Suitability
  • Addresses performance expectations for aircraft and spacecraft component welding.
• Conformance and Inspection
  • Points to additional standards (such as EN 3879 for technical specification and inspection).

Applications

This standard is essential wherever reliable, high-temperature welding filler materials are needed in aerospace environments:

• Aircraft Construction
  • Employed in the assembly and repair of structures subjected to high thermal and mechanical loads.
• Engine Components
  • Used for welding critical parts such as turbine blades, combustion chambers, and exhaust elements.
• Pre-form Manufacturing
  • Supports production of pre-forms-intermediate shapes that are later processed into finished aerospace components.
• Spacecraft Fabrication
  • Suitable for space vehicle parts, where material performance is vital in extreme conditions.
• High-Temperature Mechanical Assemblies
  • Any application in aerospace where sustained heat resistance is mandatory.

Related Standards

For comprehensive implementation and qualification of filler metals for welding in aerospace, the following standards are relevant:

• EN 2043: Aerospace series - Metallic materials - General requirements for semi-finished product qualification (excluding forgings and castings)
• EN 3879: Aerospace series - Metallic materials - Filler metal for welding - Technical specification
• EN 4258: Aerospace series - General organization of metallic material standardization
• EN 4500-3: Aerospace series - Rules for drafting and presentation of material standards - Specific rules for heat resisting alloys

Practical Value

Adhering to SIST EN 4326:2002 ensures:

• Consistency in Material Properties
  • Guarantees that welding filler metals meet demanding aerospace quality standards.
• Safety and Performance
  • Contributes to the long-term reliability and safety of welded joints in critical aerospace components.
• Regulatory Compliance
  • Facilitates acceptance in international supply chains and certification processes.
• Efficient Procurement and Production
  • Simplifies sourcing by providing clear, harmonized requirements recognized across the European aerospace sector.

By referencing SIST EN 4326:2002, manufacturers, suppliers, and engineers can ensure optimum selection and use of CoCr28W20Ni5V1 welding filler materials in high-performance aerospace applications.