ISO 12153:2022

Overview

ISO 12153:2022 - "Welding consumables - Tubular-cored electrodes for gas‑shielded and non‑gas‑shielded metal arc welding of nickel and nickel alloys - Classification" defines how tubular‑cored welding electrodes for nickel and nickel alloys are classified. The second edition (2022) updates alloy chemistries and classification rules and replaces ISO 12153:2011. The standard covers classification symbols, chemical composition limits for the all‑weld metal, minimum mechanical properties, and designation rules for tubular‑cored electrodes used with or without shielding gas.

Key Topics and Requirements

• Scope: Applies to tubular‑cored electrodes where nickel is the predominant element in the deposited (all‑weld) metal.
• Classification format: A five‑part designation:
  1. Product/process symbol - T for tubular‑cored electrode
  2. Chemical composition symbol - Ni + four digits (see Table 1)
  3. Electrode core/slag type (Table 3)
  4. Shielding gas symbol (ISO 14175; NO denotes no gas shield)
  5. Welding position symbol (ISO 6947)
• Chemical composition: Table 1 lists alloy groups (e.g., nickel‑copper, nickel‑chromium, nickel‑molybdenum) and detailed element ranges for all‑weld metal. The first digit grouping indicates alloy family (4 = Ni‑Cu, 6 = Ni‑Cr, 10 = Ni‑Mo).
• Mechanical properties: Table 2 specifies minimum yield strength, tensile strength and elongation for each alloy classification (all‑weld metal requirements).
• Electrode core types: Symbols include B (basic), R/P (rutile slow/fast‑freezing), M (metal powder), U (self‑shielding), Z (other).
• Testing and analysis: Chemical analysis is performed on suitable all‑weld metal specimens (referenced ISO 6847). The document also covers rounding procedures, retest, and technical delivery conditions.
• Notable 2022 changes: Updated references, revised chemistries in Table 1, added Ni 6023 and a restricted Ni 6117R, and adjusted minimum elongation for Ni 1013.

Applications and Users

Who uses ISO 12153:2022:

• Welding consumable manufacturers - to classify and label tubular‑cored electrodes for nickel alloys.
• Welding engineers and fabricators - to select appropriate filler metal based on all‑weld metal chemistry and mechanical properties.
• Quality assurance / inspectors - to verify compliance of filler materials and welded deposits against specified classifications.
• Procurement and standards compliance teams - to specify requirements in purchasing documents and technical delivery conditions.

Practical uses:

• Ensures interchangeability and traceability of nickel alloy tubular‑cored electrodes.
• Guides electrode selection for corrosion‑resistant, high‑temperature, or high‑strength nickel alloy welding applications.
• Standardizes chemical and mechanical acceptance criteria for weld procedure qualification and material certification.

Related Standards (if applicable)

Normative references cited in ISO 12153:2022 include:

• ISO 544, ISO 6847, ISO 6947, ISO 14175, ISO 14344, ISO 15792‑1:2020, ISO 80000‑1:2009

Keywords: ISO 12153:2022, tubular‑cored electrodes, nickel alloys, welding consumables, all‑weld metal, chemical composition, mechanical properties, electrode classification.