EN 4105:1998

Overview

EN 4105:1998 specifies requirements for the aerospace series filler metal Nickel base alloy NI‑B40002 (NiSi4B2) in the form of brazing tape. Published by CEN, this standard defines the material designation, intended form, and the quality expectations for a nickel‑based brazing filler used in aerospace joining operations. It is commonly cited in procurement, quality assurance, and engineering documents where consistent, aerospace‑grade brazing materials are required.

Key topics and requirements

While the full standard contains the authoritative technical details, EN 4105 typically covers the following areas for NI‑B40002 (NiSi4B2) brazing tape:

• Material identification and alloy designation (NI‑B40002 / NiSi4B2).
• Form and presentation: tape geometry, thickness ranges and preferred formats for aerospace brazing processes.
• Chemical characterisation: alloying elements indicated by the NiSi4B2 designation (nickel with silicon and boron additions) and expected compositional control.
• Physical properties and metallurgical behaviour relevant to brazing performance (melting/flow characteristics and compatibility with nickel‑based substrates).
• Manufacturing and processing tolerances for tape production to ensure consistent application and handling.
• Inspection and testing: methods for verifying composition, dimensional conformity, cleanliness and bonding performance.
• Marking, packaging and traceability requirements to support quality management and airworthiness documentation.
• Acceptance criteria for supply and non‑conformity handling in aerospace manufacturing contexts.

Applications

EN 4105:1998 is focused on aerospace brazing applications where a reliable nickel‑base filler metal is required. Typical uses include:

• Joining and repair of nickel‑base alloys and superalloys in turbine components, hot‑section assemblies and exhaust systems.
• Fabrication of heat‑resistant assemblies where brazing tape enables controlled deposition of filler metal.
• Situations demanding high traceability and certified material performance for airworthiness compliance.

Using standardized brazing tape helps ensure reproducible joints, predictable high‑temperature behaviour and compatibility with aerospace cleaning and inspection regimes.

Who uses this standard

• Aerospace materials engineers specifying brazing consumables.
• Procurement and supply chain teams sourcing certified filler metals.
• Quality assurance and inspection personnel ensuring compliance.
• Brazing technicians and repair shops following approved processes.
• Manufacturers of turbine and hot‑section components.

Related standards

EN 4105:1998 should be used alongside other EN/ISO standards on brazing, nickel alloys and metallurgical testing, and with organization‑specific aerospace material specifications and quality systems (e.g., NADCAP, AS/EN series). For procurement and technical alignment, reference the full EN 4105 document for authoritative requirements and test methods.

Keywords: EN 4105:1998, NI‑B40002, NiSi4B2, nickel base alloy, filler metal for brazing, brazing tape, aerospace brazing, CEN.