EN 3944:1998

Overview

EN 3944:1998 is a CEN standard specifying the requirements for a nickel base alloy filler metal, designated NI-B41204 (NiCr13Si4B3), in tape form used for brazing in aerospace applications. This standard belongs to the aerospace series focusing on high-performance materials essential for joining components in critical aerospace manufacturing. The nickel-based filler metal tape ensures strong, corrosion-resistant joints in high-temperature environments typical of aerospace engineering.

Key Topics

• Material Specification: Defines the composition and properties of nickel base alloy NI-B41204, including the chemical makeup NiCr13Si4B3, suitable for brazing.
• Form Factor: Details requirements for the filler metal supplied in tape form, facilitating consistent application during assembly.
• Performance Criteria: Establishes criteria for melting temperature, mechanical strength, and chemical stability relevant to aerospace conditions.
• Quality Assurance: Includes standards for manufacturing, handling, and testing to ensure reliability in critical aerospace structures.
• Cross-references: Aligns with related European and international aerospace standards for materials and brazing processes.

Applications

EN 3944:1998 filler metal tape is primarily used in the aerospace industry for joining nickel-based alloys and other materials requiring durable, heat-resistant brazed joints. Typical applications include:

• Aircraft Engine Components: High-temperature resistant joints in turbine blades, combustors, and heat exchangers.
• Structural Assemblies: Brazing repair or assembly of structural parts requiring strong, corrosion-resistant bonds.
• Aerospace Heat Exchangers: Joining thin-walled components where tape form filler metal improves control over material deposition.
• Spacecraft Manufacturing: Use in critical assemblies exposed to harsh thermal environments and mechanical stresses.

Using nickel base filler metal tape ensures enhanced mechanical strength, resistance to oxidation, and long service life of aerospace components subjected to extreme conditions.

Related Standards

To complement EN 3944:1998 and achieve high-quality brazing in aerospace applications, refer to related standards such as:

• EN 12796 – Nickel and nickel alloy wire for brazing.
• EN 14672 – Aerospace series - Brazing alloys for high-performance alloys.
• EN ISO 9455 – Brazing techniques and methods for aerospace materials.
• AMS 4777 – Aerospace material specification for nickel-based brazing alloys.

These standards cover broader brazing materials, techniques, and quality controls, ensuring comprehensive guidelines for aerospace manufacturing and maintenance.

Keywords: EN 3944, nickel base alloy, NI-B41204, NiCr13Si4B3, filler metal, brazing tape, aerospace brazing, high-temperature brazing, nickel brazing alloy, aerospace materials standard, CEN aerospace standards, brazed joints, aircraft manufacturing materials.