ISO 3677:2024
(Main)Filler metal for brazing - Designation
Filler metal for brazing - Designation
This document specifies designations for filler materials for brazing on the basis of their chemical composition. The designation includes their solidus/liquidus temperatures. This document applies to the metallic part of filler materials used in brazing products, for example foils, wires, rods, pastes, flux-coated rods or wires and flux-cored rods or wires.
Métaux d'apport de brasage fort — Désignation
Le présent document spécifie les désignations pour les métaux d'apport de brasage fort d’après leur composition chimique. La désignation inclut leurs températures de solidus/liquidus. Le présent document s'applique à la partie métallique des métaux d'apport utilisés pour les produits de brasage fort, par exemple feuillards, fils, baguettes, pâtes, fils ou baguettes enrobés de flux et fils ou baguettes fourrés de flux.
General Information
- Status
- Published
- Publication Date
- 26-Apr-2024
- Technical Committee
- ISO/TC 44/SC 13 - Brazing materials and processes
- Drafting Committee
- ISO/TC 44/SC 13 - Brazing materials and processes
- Current Stage
- 6060 - International Standard published
- Start Date
- 27-Apr-2024
- Due Date
- 09-Dec-2024
- Completion Date
- 27-Apr-2024
Relations
- Effective Date
- 24-Dec-2022
- Effective Date
- 10-Dec-2022
Overview
ISO 3677:2024 - "Filler metal for brazing - Designation" defines a standardized naming system for the metallic part of brazing filler materials based on chemical composition and melting range. It applies to metallic filler components used in foils, wires, rods, pastes, flux‑coated rods/wires and flux‑cored rods/wires. The designation explicitly includes solidus and liquidus temperatures to support process control and material selection.
Key topics and requirements
- Designation structure: three parts separated by dashes:
- First part: the letter B (for brazing).
- Second part: group of chemical symbols and nominal mass percentages indicating alloy constituents.
- Third part: solidus/liquidus temperatures in °C, separated by a slash.
- Composition rules:
- Major element chemical symbol first, followed by its nominal mass percentage (whole number, ±1 accuracy).
- When an element has a specified range, use the mean rounded to the nearest whole number (round-even on ties); if only a minimum is given, use the rounded minimum.
- Other elements listed in decreasing nominal percentage; ties resolved by decreasing atomic number.
- Elements with nominal values <1% are omitted unless they are functional; functional minor elements are shown in parentheses.
- Only the first six constituents are indicated in the designation.
- Temperature reporting: solidus temperature first, then liquidus (e.g., S 970 °C–L 1 105 °C shown as 970/1105 in the designation).
- Examples:
- B-Ag72Cu-780 (72 % Ag, 28 % Cu, melting at 780 °C)
- B-Ag72Cu(Li)-780 (with <1 % Li functional)
- B-Ni63WCrFeSiB-970/1105
Applications
ISO 3677:2024 is used for:
- Standardized labelling and specification of brazing filler alloys on product data sheets and material certificates.
- Procurement and contract documents requiring unambiguous identification of filler metal composition and melting range.
- Process selection and quality control in brazing operations where melting range (solidus/liquidus) affects joint integrity, heating cycles, and base‑metal compatibility.
- Communicating alloy content between manufacturers, suppliers and end users in industries such as HVAC, automotive, aerospace, electronics and general joining/fabrication.
Who should use this standard
- Welding and brazing engineers, materials and quality managers
- Filler‑metal manufacturers and distributors
- Specification writers, purchasers and testing labs
- Standards committees and regulatory bodies involved in brazing materials
Related standards
- ISO 9453 (soldering materials designations) - soldering designations were removed from ISO 3677:2024 and are now covered separately by ISO/TC 44/SC 12.
Keywords: ISO 3677:2024, filler metal for brazing, brazing filler designation, solidus liquidus, brazing alloys, brazing materials.
Frequently Asked Questions
ISO 3677:2024 is a standard published by the International Organization for Standardization (ISO). Its full title is "Filler metal for brazing - Designation". This standard covers: This document specifies designations for filler materials for brazing on the basis of their chemical composition. The designation includes their solidus/liquidus temperatures. This document applies to the metallic part of filler materials used in brazing products, for example foils, wires, rods, pastes, flux-coated rods or wires and flux-cored rods or wires.
This document specifies designations for filler materials for brazing on the basis of their chemical composition. The designation includes their solidus/liquidus temperatures. This document applies to the metallic part of filler materials used in brazing products, for example foils, wires, rods, pastes, flux-coated rods or wires and flux-cored rods or wires.
ISO 3677:2024 is classified under the following ICS (International Classification for Standards) categories: 25.160.50 - Brazing and soldering. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 3677:2024 has the following relationships with other standards: It is inter standard links to ISO/TR 23846:2022, ISO 3677:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 3677:2024 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
International
Standard
ISO 3677
Fourth edition
Filler metal for brazing -
2024-04
Designation
Métaux d'apport de brasage fort — Désignation
Reference number
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and requirements . 1
4.1 General .1
4.2 First part .1
4.3 Second part .1
4.4 Third part .2
5 Examples . 2
iii
Foreword
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Norme
internationale
ISO 3677
Quatrième édition
Métaux d'apport de brasage fort —
2024-04
Désignation
Filler metal for brazing - Designation
Numéro de référence
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2024
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
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être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
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Publié en Suisse
ii
Sommaire Page
Avant-propos .iv
1 Domaine d'application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Symboles et exigences . 1
4.1 Généralités .1
4.2 Première partie .1
4.3 Deuxième partie .1
4.4 Troisième partie .2
5 Exemples . 2
iii
Avant-propos
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