Understanding EN ISO 15614-7: The Standard for Overlay Welding EN ISO 15614-7
is a critical international standard that specifies how to qualify a welding procedure for overlay welding through standardized tests
. Part of the broader ISO 15614 series, this document ensures that surfacing processes—used for protection against corrosion or wear—meet rigorous quality and safety requirements. The latest major revision is ISO 15614-7:2016 , which replaced the 2007 edition. Scope and Application
This standard applies to all welding processes suitable for overlaying, including: Corrosion-resistant overlays : Protecting base metals from chemical degradation. Hardfacing : Increasing resistance to wear and impact. : Creating a transition layer between dissimilar materials. : Restoring dimensions to parent metals.
It is widely used in industries such as petrochemical, power generation, mining, and pressure equipment manufacturing. Key Technical Requirements
To qualify a procedure under this standard, manufacturers must develop a preliminary Welding Procedure Specification (pWPS) and successfully complete a Welding Procedure Qualification Test (WPQT) Test Pieces en iso 15614-7 pdf
: Standardized plate or pipe test pieces must be welded under production conditions. Examination and Testing Non-Destructive Testing (NDT)
: Includes visual inspection (VT) and surface crack detection like liquid penetrant (PT) or magnetic particle (MT) testing. Destructive Testing
: Includes macroscopic/microscopic examination, hardness testing, side-bend tests, and chemical analysis of the overlay. Range of Qualification (Clause 8)
: Defines the limits for variations in variables like parent material, filler material, thickness, welding position, and heat input without requiring a new test. Accessing the PDF
The full document is a protected copyright work and is typically available for purchase from official standards bodies: Official digital versions can be obtained through the European regional versions, such as EN ISO 15614-7:2019 , are available via providers like iTeh Standards Current Edition ISO 15614-7:2016 Published & Active 25.160.10 (Welding processes) Related Standard ISO 15614-1 (Arc/Gas welding of steels) range of qualification variables for hardfacing? Understanding EN ISO 15614-7: The Standard for Overlay
EN ISO 15614-7 is the international standard governing the specification and qualification of welding procedures for overlay welding. Unlike Part 1, which focuses on butt and fillet welds, Part 7 specifically handles the application of surfacing materials, such as corrosion-resistant overlays or hardfacing. Key Overview of the Standard
Purpose: It defines how a preliminary welding procedure specification (pWPS) for overlaying is qualified through standardized tests.
Applications: Specifically covers corrosion-resistant overlays, hardfacing, and other surface treatments. It does not apply to standard build-up or repair of parent metal, which are covered by ISO 15614-1 or ISO 15613.
Current Version: The most recent harmonized European version is EN ISO 15614-7:2019, which adopts the international ISO 15614-7:2016 text. Core Components & Requirements
The standard outlines strict conditions for the execution of qualification tests, including: Manual metal arc welding (MMA) Gas-shielded metal arc
Range of Qualification: Defines the limits of variables (such as material thickness, overlay thickness, and welding position) under which the qualification remains valid.
Examination and Testing: Requires a combination of non-destructive testing (NDT), such as penetrant inspection, and destructive testing to verify the integrity of the overlay.
Buttering: If a buffer layer is used between dissimilar materials (e.g., ferritic steel and austenitic overlay), this must also be qualified, often in conjunction with ISO 15614-1. Accessing the PDF
While official standards must be purchased, technical previews and historical drafts are often indexed on academic or document-sharing platforms:
Official Sources: Full documents are available through national standards bodies like the BSI Knowledge Store or the ISO Store.
Drafts/Previews: Publicly accessible previews and draft fragments can sometimes be found on platforms like Scribd or iTeh Standards.
Buttering (a layer deposited to isolate the base metal) requires specific tests under Clause 8 of the standard.