In simpler terms, this standard tells you exactly how to prove—through destructive and non‑destructive testing—that your proposed welding procedure for applying a layer of material onto a base metal will consistently produce sound results.
The standard defines the shape, dimensions, and minimum thickness of the test pieces required for qualification. The coupon must accurately represent the geometry of the actual production component, accounting for factors like: Base metal thickness Number of overlay layers (single-layer vs. multi-layer) Welding position (e.g., flat, vertical, overhead) 2. Welding the Test Piece
| Feature | EN ISO 15614-1 | EN ISO 15614-7 | | :--- | :--- | :--- | | | Joining two pieces of metal (butt and fillet welds) | Depositing a layer onto a base metal (overlay/surfacing) | | Typical industries | Structural steel, pressure vessels, pipelines | Corrosion protection, wear‑resistant surfaces, oil & gas | | Key destructive tests | Tensile test, bend test, impact test, macro exam | Macro examination, hardness testing, side bend test, chemical analysis | | Qualified property | Joint strength, integrity, and toughness | Surface properties (corrosion resistance, hardness, composition) |
C -- Success --> D[Compare Results to Acceptance Criteria<br>per Clause 7.5] D -- Meets criteria --> E[Document in Welding Procedure Qualification Record (WPQR)] E --> F[Define Qualification Range per Clause 8] F --> G[Qualified Welding Procedure]
: Lining vessels handling highly corrosive acids. Mining : Hardfacing excavator teeth and crushing equipment. 🧪 The Qualification Process en iso 15614-7 pdf
To verify the hardness of the overlay and the heat-affected zone (HAZ).
The is essential for quality managers, welding engineers, and inspectors. It is available through national standards bodies like BSI (BS EN ISO 15614-7:2019), DIN, or directly from ISO. Benefits of having the document include:
The standard outlines the exact minimum dimensions for test pieces and the precise locations where test specimens must be extracted.
Overlay welding, also known as cladding or hardfacing, involves applying a layer of specialized alloy onto a cheaper or less resistant base metal. In simpler terms, this standard tells you exactly
Imagine a heavy-duty chemical reactor designed to hold highly corrosive acid. The base metal of the reactor is strong enough to hold the pressure, but it would dissolve in minutes without a special protective lining. To save the vessel, engineers decide to use overlay welding (also known as cladding or hardfacing).
: Deviations in heat input affect dilution and cooling rates, altering material properties. 📥 Accessing the EN ISO 15614-7 PDF
: The process begins with a Preliminary Welding Procedure Specification (pWPS) , a document detailing all proposed welding parameters, including the base and filler materials, preheat and interpass temperatures, welding positions, and post-weld heat treatment requirements. For overlay welding, the standard specifically addresses corrosion-resistant and hardfacing procedures.
ISO 15614-7:2016 - Overlay Welding Procedure Specification and multi-layer) Welding position (e
To ensure these protective layers perform reliably under harsh operational conditions, manufacturers must qualify their welding processes. This is where becomes essential. What is EN ISO 15614-7?
To qualify an overlay welding process, physical test pieces must mirror intended shop production environments. An accredited independent examiner or a designated examining body must actively witness the entire test coupon preparation and welding sequence. 1. Test Piece Configurations
If you are currently setting up a welding coordination system, let me know: What you plan to use (e.g., TIG, MIG, SAW)?
Destructive testing verifies the hidden qualities of the overlay weld:
Adhering to is mandatory for industries where overlay welding ensures the integrity of equipment, such as in the oil and gas, chemical, and manufacturing sectors. By following the testing and qualification procedures outlined in this standard, manufacturers can guarantee the quality, strength, and corrosion resistance of their overlay-welded components.