: Evaluates the ductility and bond strength between the overlay and base metal. 📋 Range of Qualification

While official standards must be purchased, technical previews and historical drafts are often indexed on academic or document-sharing platforms:

Verifying the bond between the overlay and parent metal. How to Access the Official PDF

The official source for the International Standard.

Note: For laser beam welding, the threshold is 12 mm instead of 25 mm.

| | Qualification Range | |---|---| | t < 25 mm | 0.5 × t to 2 × t | | t ≥ 25 mm | 25 mm to unlimited |

Qualifying a welding procedure under EN ISO 15614-7 requires a systematic approach. The manufacturer must prepare a preliminary Welding Procedure Specification (pWPS) and create physical test coupons.

is a European Adoption of an International Standard titled: "Specification and qualification of welding procedures for metallic materials – Welding procedure test – Part 7: Overlay welding."

Every test piece must undergo:

: The standard applies to all welding processes suitable for overlay welding , which includes both corrosion-resistant overlays hardfacing Qualification Method

: Standardized plate or pipe test pieces must be welded under production conditions. Examination and Testing Non-Destructive Testing (NDT)

| | Typical Application | Relationship to Part 7 | |---|---|---| | ISO 15614-1 | Arc and gas welding of steels, nickel, and nickel alloys | Used for final joining after overlay, and for qualification of buttering layers | | ISO 15614-7 | Overlay/cladding/hardfacing | Primary qualification for surface deposits | | ISO 15614-13 | Resistance and flash welding | Not directly related | | ISO 15614-14 | Laser and electron beam welding | Not directly related |

is an international standard that specifies how a preliminary welding procedure specification (pWPS) for overlay welding is qualified through welding procedure tests. It provides the necessary framework for testing to ensure the overlay meets performance criteria. Key Aspects of the Standard

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.

This article provides a deep dive into the requirements of EN ISO 15614-7, explains why finding the official standard is critical, and outlines how to use the specification correctly. Please note: While this guide explains the standard, to perform formal qualification.

corrosion barrier, a thick test coupon cannot qualify it due to higher dilution risks near the interface.