SIST EN 3946:2001

Overview

SIST EN 3946:2001 is a European standard published by CEN that addresses the requirements for a specific nickel base alloy used as filler metal in brazing applications within the aerospace industry. The alloy, designated NI-B15701 (NiPd34Au30), is available in powder or paste form and is engineered to meet the demanding performance criteria essential for aerospace components. This standard ensures consistent quality, reliability, and performance of brazing materials that contribute to the structural integrity and longevity of aerospace assemblies.

Key Topics

• Nickel Base Alloy NI-B15701 Composition
  The standard focuses on the nickel base alloy NI-B15701, which comprises nickel with significant palladium (Pd) and gold (Au) content, specifically NiPd34Au30. This unique composition offers excellent corrosion resistance, high temperature stability, and optimal mechanical properties suitable for aerospace brazing processes.

• Filler Metal Forms
  It specifies the acceptable forms of the filler metal, namely powder or paste. These forms facilitate precise application and controlled brazing for complex aerospace components.

• Brazing Requirements
  The standard outlines the necessary chemical, physical, and mechanical properties that the filler metal must meet to ensure effective bonding in high-performance aerospace applications.

• Quality and Compliance
  SIST EN 3946:2001 enforces stringent quality requirements to assure material uniformity, compatibility with aerospace base materials, and adherence to safety standards during brazing operations.

Applications

• Aerospace Manufacturing
  This filler metal is primarily used in the fabrication and repair of aerospace components, including engine parts, turbine blades, and structural elements that require strong, heat-resistant joints.

• High-Temperature Joints
  It is ideal for brazing applications exposed to extreme temperatures and harsh environments, where durability and performance are critical.

• Corrosion-Resistant Assemblies
  The nickel-palladium-gold alloy composition provides excellent resistance to oxidation and corrosion, making it valuable in aerospace environments subject to varying atmospheric conditions.

• Precision Brazing Operations
  Available in powder or paste, the filler metal supports detailed and complex brazing techniques that demand controlled application for quality assurance.

Related Standards

• EN 12797 - Aerospace filler metals for welding and brazing
• EN ISO 17672 - Brazing - Filler metals
• EN 485-2 - Aluminium and aluminium alloys – Mechanical properties and chemical composition relevant to aerospace
• ISO 17672 - Filler metals for brazing - Chemical requirements

These related standards collectively support comprehensive material selection, handling, and quality assurance protocols essential for aerospace manufacturing processes.

By adhering to SIST EN 3946:2001, aerospace manufacturers can ensure optimal performance and longevity of brazed joints made with nickel base alloy NI-B15701 (NiPd34Au30). This standard plays a crucial role in maintaining safety, reliability, and consistency in critical aerospace assemblies.