ISO 15614-7:2016

Overview - ISO 15614-7:2016 (Overlay welding)

ISO 15614-7:2016 specifies how a preliminary welding procedure specification (pWPS) for overlay welding is qualified by welding procedure tests. It defines the conditions for executing welding procedure tests and the range of qualification for practical overlay and hardfacing operations within the variables listed in Clause 8. The part applies to all welding processes suitable for overlay welding and complements related parts of ISO 15614 and ISO 15613 (building‑up and repair).

Key technical topics and requirements

• Scope and applicability: Qualification of overlay welding procedures; does not invalidate previous valid qualifications but requires additional tests only where the new edition demands them.
• Preliminary WPS (pWPS) and WPQR: Guidance on producing a pWPS and recording results in a Welding Procedure Qualification Record (WPQR). Annex A includes a WPQR form.
• Test pieces: Defined shapes and dimensions for plate and tube test pieces used for overlay and hardfacing qualification.
• Examination and testing:
  • Non‑destructive testing (NDT) requirements (e.g., penetrant and other NDT methods as referenced).
  • Destructive tests: macro/microscopic examination, hardness testing, side‑bend tests, chemical analysis, delta‑ferrite/ferrite number checks.
  • Acceptance criteria for both NDT and destructive examinations are specified (see Clauses 7 and Tables).
• Range of qualification (Clause 8): Rules for expanding a qualified procedure across variables such as parent material groups and thickness, filler/overlay designation and thickness, welding process and position, current type, heat input, preheat/interpass/post‑weld heat treatment, number of layers.
• Process‑specific notes: Subclauses provide specifics for common processes (e.g., manual metal arc, submerged arc, electroslag overlay, gas‑shielded, plasma, oxy‑acetylene).
• Buttering and dissimilar materials: If buttering is used between dissimilar materials, qualification is performed per ISO 15614‑1; additional tests might be required by application standards.

Practical applications - who uses this standard

ISO 15614-7 is used by:

• Welding engineers and procedure developers qualifying overlay and hardfacing procedures.
• QA/QC and inspection teams verifying WPQRs and acceptance criteria.
• Fabricators and maintenance organizations performing wear‑resistant, corrosion‑resistant overlays, or repair coatings in industries such as petrochemical, power generation, mining, pipeline, marine and heavy equipment.
• Certification bodies and third‑party inspectors assessing conformity to internationally recognized welding procedure qualification practices.

Related standards

• ISO 15613 (Welding procedure test on pre‑production test pieces / repair & build‑up)
• Other parts of ISO 15614 (Parts 1–14 cover different materials/processes)
• Normative references cited (e.g., ISO 3452‑1 for penetrant testing, ISO 5173 for bend tests)

Keywords: ISO 15614-7:2016, overlay welding, welding procedure qualification, WPQR, pWPS, hardfacing, buttering, NDT, destructive testing, range of qualification.