ISO 18276:2024

Overview - ISO 18276:2024 (Welding consumables - Tubular cored electrodes)

ISO 18276:2024 defines the classification requirements for tubular cored electrodes (with or without shielding gas) used for metal-arc welding of high‑strength steels. This third edition replaces ISO 18276:2017 and covers electrodes intended for weld metal with a minimum yield strength > 550 MPa or minimum tensile strength > 590 MPa, in either the as‑welded or post‑weld heat‑treated (PWHT) condition. The standard is a combined specification that allows product classification under two alternative systems depending on the mechanical property emphasis.

Key topics and technical requirements

• Two classification systems:
  • System A - based on yield strength of the all‑weld metal and an average impact energy of 47 J.
  • System B - based on tensile strength of the all‑weld metal and an average impact energy of 27 J.
• Classification covers: tensile and impact properties, chemical composition of all‑weld metal, type of electrode core, shielding gas, welding position, hydrogen content, and PWHT conditions.
• Testing rules:
  • One electrode can be tested and classified with multiple shielding gases if applicable.
  • Pulsed current can modify electrode behavior but is not used for determining classification.
  • Mechanical test requirements include specimen preparation, preheating and interpass temperature control, pass sequencing, PWHT procedures, and retesting rules.
• Supporting procedures and references include standards for hydrogen measurement (ISO 3690), gas specifications (ISO 14175), deposition for chemical analysis (ISO 6847), and test-piece preparation (ISO 15792‑1).
• The document includes rounding rules, examples of designations, and informative annexes describing classification structure, composition designations, electrode‑core types and usability characteristics.

Practical applications and users

Who uses ISO 18276:2024:

• Welding engineers and metallurgists selecting welding consumables for high‑strength steel fabrication.
• Consumable manufacturers certifying and labeling tubular cored electrodes.
• Quality control and inspection teams in oil & gas, pressure vessels, heavy engineering, offshore, pipeline and structural fabrication where high-strength steels are used.
• Procurement and specifications authors who require consistent classification and traceability of filler materials.

Practical value:

• Ensures consistent, comparable classification of weld metal properties across suppliers.
• Helps match consumables to parent‑metal strength and impact requirements (as‑welded or PWHT).
• Clarifies how shielding gas and electrode core type affect usability and mechanical performance.

Related standards (normative references)

• ISO 544, ISO 3690, ISO 6847, ISO 6947, ISO 13916, ISO 14175, ISO 14344, ISO 15792‑1

For full technical details, test procedures and designation examples refer to the complete ISO 18276:2024 publication.