ISO 3677-2024 PDF

Full title and description

St ISO 3677-2024 — Filler metal for brazing — Designation. This International Standard specifies a system of designation for metallic filler materials used in brazing on the basis of chemical composition and includes information on solidus and liquidus temperatures; it applies to the metallic portion of brazing products such as foils, wires, rods, pastes, flux‑coated and flux‑cored fillers.

Abstract

ISO 3677:2024 provides standardized designations for brazing filler metals based on their chemical composition and melting characteristics. The designation format includes composition information and, for brazing alloys, the solidus and liquidus temperatures. The document is intended to cover only the metallic part of filler products (not fluxes, binders or coatings) and to promote consistent identification, specification and procurement of brazing filler metals across industry and international supply chains.

General information

• Status: Published (current)
• Publication date: 27 April 2024
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 25.160.50 (Brazing and soldering)
• Edition / version: Edition 4 (ISO 3677:2024)
• Number of pages: 2 (core ISO edition; national/adopted versions may vary)

Scope

This standard specifies the designation system for metallic filler materials for brazing, based on chemical composition and melting range. It applies to the metallic component of filler products (foils, wires, rods, pastes, flux‑coated/flux‑cored products). The designation includes composition identifiers and solidus/liquidus temperatures where applicable and is intended for use in specification, labelling, purchasing and technical documentation for brazing alloys.

Key topics and requirements

• Standardized designation format for brazing filler metals tied to chemical composition.
• Inclusion of solidus and liquidus temperature information for brazing alloys in the designation.
• Applicability restricted to the metallic portion of brazing products (excludes flux chemistry and non‑metallic binders/coatings).
• Clarifies designation use for a range of product forms (wires, rods, foils, pastes, flux‑coated or flux‑cored fillers).
• Aims to harmonize identification across suppliers, purchasers, testing laboratories and regulators.

Typical use and users

ISO 3677:2024 is used by filler‑metal manufacturers, brazing consumable suppliers, procurement and quality departments, welding/brazing engineers, laboratories performing alloy identification or acceptance testing, standards bodies and technical committees. Typical applications include product specification, marking/labeling of filler materials, tender documents, quality control records and cross‑referencing between national and international alloy designations.

Related standards

Standards commonly referenced alongside ISO 3677:2024 include ISO 17672 (Brazing — Filler metals: compositional classes and delivery conditions), ISO 18496 (Fluxes for brazing — classification and technical delivery conditions), ISO 18279 (Brazing — Imperfections in brazed joints) and the previous edition ISO 3677:2016 (now withdrawn and superseded by the 2024 edition). Other national/adopted EN versions and regional adoptions of these ISO documents are also related.

Keywords

filler metal; brazing; designation; alloy designation; solidus; liquidus; chemical composition; brazing wire; brazing rod; flux‑coated; flux‑cored; ISO/TC 44; brazing alloys

FAQ

Q: What is this standard?

A: ISO 3677:2024 is an International Standard that defines a designation system for metallic filler materials used in brazing, linking alloy designations to chemical composition and (for brazing alloys) melting range information.

Q: What does it cover?

A: It covers the metallic portion of brazing filler products — foils, wires, rods, pastes and flux‑coated or flux‑cored fillers — and specifies how these fillers should be designated based on composition and solidus/liquidus temperatures. It does not set mechanical performance limits, brazing procedures or flux chemistry requirements.

Q: Who typically uses it?

A: Filler‑metal manufacturers and suppliers, brazing engineers, procurement and quality teams, testing laboratories, and standards or certification bodies use this standard for consistent identification, ordering and documentation of brazing alloys.

Q: Is it current or superseded?

A: ISO 3677:2024 is the current published edition (Edition 4, published 27 April 2024). It supersedes and replaces ISO 3677:2016.

Q: Is it part of a series?

A: While ISO 3677 is a standalone designation standard, it forms part of the body of ISO standards on brazing and soldering maintained by ISO/TC 44/SC 13 and is commonly used together with standards such as ISO 17672 (filler metal classes), ISO 18496 (fluxes) and ISO 18279 (imperfections in brazed joints).

Q: What are the key keywords?

A: Key keywords are: filler metal, brazing, designation, alloy composition, solidus, liquidus, brazing wire, brazing rod, flux‑coated, flux‑cored.