ISO 636-2024 PDF

Full title and description

St ISO 636-2024 — Welding consumables — Rods, wires and deposits for tungsten inert gas (TIG) welding of non‑alloy and fine‑grain steels — Classification. This edition defines the classification, designation and minimum mechanical/chemical requirements for TIG filler materials used in the as‑welded condition and after post‑weld heat treatment (PWHT) for steels with yield strength up to 500 MPa or tensile strength up to 570 MPa.

Abstract

This international standard specifies requirements for classification of rods, wires and deposited weld metal for TIG welding of non‑alloy and fine‑grain steels. It provides two alternative classification systems: a system based on all‑weld‑metal yield strength together with an average impact energy of 47 J (system A), and a system based on all‑weld‑metal tensile strength together with an average impact energy of 27 J (system B). Components or classification items that carry the suffix “system A” or “system B” indicate applicability to the corresponding system; items without a suffix apply to both systems. The document includes tables, designation rules and testing/verification requirements for as‑welded and PWHT conditions.

General information

• Status: Published.
• Publication date: 2024 (published September 2024, sixth edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.160.20 (Welding consumables).
• Edition / version: Edition 6 (ISO 636:2024).
• Number of pages: 13 (main ISO edition PDF).

Scope

ISO 636:2024 covers classification of TIG welding filler materials — rods, bare wires and the deposits they produce — for non‑alloy and fine‑grain steels where the all‑weld‑metal minimum yield strength is up to 500 MPa or minimum tensile strength up to 570 MPa. It applies to consumables in both the as‑welded state and after specified post‑weld heat treatment, and sets out mechanical property classes, impact energy requirements, chemical composition limits where relevant, and rules for testing and designation.

Key topics and requirements

• Two classification systems: System A (yield strength + 47 J impact) and System B (tensile strength + 27 J impact); suffixes indicate applicability.
• Designation scheme and symbols for strength, elongation and impact properties of all‑weld metal.
• Mechanical testing requirements for as‑welded and post‑weld heat‑treated conditions, including specimen preparation and acceptance criteria.
• Chemical composition limits and tolerances for filler materials where applicable.
• Rules and guidance for preheating, interpass temperature and PWHT used during test welds and classification testing.
• Delivery conditions, rounding/retesting procedures and documentation/marking conventions for consistent procurement and quality control.
• Technical revisions from the previous edition (2017): formatting updates, updated normative references, revised chemical limits for some classifications, clarified table footnotes (including a boron footnote), alignment of some requirements with related standards and addition of new classifications in system B.

Typical use and users

Used by welding engineers, metallurgists, QA/QC and procurement teams, and manufacturers of welding consumables to specify, classify and accept TIG filler rods and wires for non‑alloy and fine‑grain steels. It supports weld procedure specification/qualification, supplier product classification and laboratory testing/acceptance of consumables for construction, pressure equipment, heavy fabrication and other industries requiring controlled weld metal properties.

Related standards

Key related documents and normative references typically used alongside ISO 636 include standards covering delivery conditions and test methods for welding consumables, European adoptions (EN ISO 636:2024 / national implementations), and earlier ISO editions (ISO 636:2017 and earlier). Other welding and consumable standards (national or industry) that interact with ISO 636 include standards for welding procedure qualification, tensile and impact test methods, and specific filler‑metal chemical/compositional specifications referenced in the normative clauses.

Keywords

ISO 636, TIG welding, welding consumables, rods, wires, filler metal, classification, non‑alloy steel, fine‑grain steel, yield strength, tensile strength, impact energy, post‑weld heat treatment.

FAQ

Q: What is this standard?

A: ISO 636:2024 is the international classification standard for TIG welding filler materials (rods, wires and the deposits they form) intended for non‑alloy and fine‑grain steels, providing designation rules and minimum mechanical/chemical requirements for as‑welded and PWHT conditions.

Q: What does it cover?

A: It covers classification systems for all‑weld metal strength and toughness (two systems: A and B), symbols and designation conventions, mechanical and chemical requirements, testing and verification procedures, and delivery/marking/documentation rules for TIG consumables used on steels up to the stated strength limits.

Q: Who typically uses it?

A: Welding engineers, filler‑metal manufacturers, quality and procurement specialists, testing laboratories and standards committees use this standard to classify, specify and accept TIG filler materials for industrial welding applications.

Q: Is it current or superseded?

A: Current — ISO 636:2024 is the sixth edition and replaces the previous ISO 636:2017 edition. It was published in 2024 and is the authoritative edition to use unless a later revision is published.

Q: Is it part of a series?

A: ISO 636 is part of the family of standards produced by ISO/TC 44 (Welding and allied processes) addressing welding consumables, filler‑metal classification and related test/identification systems; it is closely aligned with regional adoptions (EN ISO) and other welding test and delivery standards referenced in its normative clauses.

Q: What are the key keywords?

A: TIG welding, welding consumables, filler rods, filler wires, classification, all‑weld metal, yield strength, tensile strength, impact energy, PWHT, non‑alloy steel, fine‑grain steel.