SIST EN 3962:2002

Overview

SIST EN 3962:2002 is a European standard developed by CEN that specifies the requirements for the gold base alloy AU-B40001 used as a filler metal in brazing applications within the aerospace sector. This standard focuses on the wire form of this filler metal, ensuring consistent quality and performance in critical aerospace manufacturing and repair processes. As part of the aerospace series standards, SIST EN 3962:2002 aligns with the general organizational principles outlined in EN 4258 and follows strict drafting rules per EN 4500-6.

The primary objective of this standard is to provide aerospace manufacturers and suppliers with clear technical specifications for the gold-based brazing alloy wire to guarantee safety, reliability, and compliance in high-performance aerospace components.

Key Topics

• Material Designation:
  The standard designates the filler metal as Gold base alloy AU-B40001, detailing its chemical composition primarily consisting of gold with specified limits on nickel (Ni), aluminum (Al), platinum (Pt), titanium (Ti), and zirconium (Zr).

• Chemical Composition and Manufacture:
  The alloy includes approximately 17.5% aluminum with trace elements such as nickel, platinum, titanium, and zirconium maintained within tightly controlled limits. The material is melted using air, inert gas, or vacuum techniques and produced as cold-formed and cleaned wire.

• Physical Form and Dimensions:
  SIST EN 3962:2002 applies exclusively to the wire form of the filler metal with dimensional limits specified to ensure compatibility with aerospace brazing equipment.

• Technical Specifications:
  Requirements related to chemical content, physical dimensions, heat treatment, delivery condition (as manufactured or annealed), and other mechanical properties are included, referencing EN 3875 for detailed filler metal specifications and test methods.

• Quality and Testing:
  The standard mandates compliance with external defect inspections, thermal analysis, wettability fusion tests, batch uniformity checks, marking, and dimensional inspections described in EN 3875. These quality controls ensure the filler metal meets aerospace-grade performance under extreme conditions.

• Applications Note:
  This gold base filler metal is typically used for joining nickel base alloys, a common practice in the aerospace industry to maintain integrity in high-temperature and high-stress environments.

Applications

SIST EN 3962:2002 addresses critical needs in aerospace manufacturing and maintenance by providing a standardized filler metal for brazing operations, including:

• Joining High-Performance Alloys:
  Used extensively to join nickel base alloys and similar metals common in jet engines, turbine components, and other aerospace structures.

• Repair and Overhaul:
  Supports aerospace repair specialists who require reliable brazing filler metals with predictable performance to restore critical components without compromising safety.

• Aerospace Component Production:
  Enables manufacturers to maintain consistent brazing quality in the assembly of complex aerospace parts where gold-based alloys provide superior oxidation resistance, ductility, and strength.

• Thermal and Mechanical Stability:
  The standard ensures the filler metal wire will perform under the demanding thermal cycles and mechanical stresses experienced in aerospace service environments.

Related Standards

SIST EN 3962:2002 is part of a broader framework of aerospace material standards designed to harmonize metallic material specifications and quality control processes:

• EN 3875:
  Aerospace series specification covering filler metals for brazing, including technical criteria, testing methods, and delivery conditions-directly referenced for detailed requirements.

• EN 2043:
  General requirements for semi-finished aerospace metallic products, providing foundational rules for qualification and product conformity.

• EN 4258:
  Describes the organizational principles and classification approaches for aerospace metallic standards, ensuring consistency across the series.

• EN 4500-6:
  Details drafting and presentation rules specifically for filler metals used in brazing, guiding the format and content of standards like EN 3962.

By adhering to these related standards, manufacturers and users of the SIST EN 3962:2002 filler metal wire can ensure full compliance and interoperability within aerospace supply chains across Europe.

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