The process begins with creating a Preliminary Welding Procedure Specification (pWPS). This document details all proposed welding parameters that will be tested.
Do not rely on second-hand summaries or illegal copies. Purchase the official PDF from a national standards body, study its clauses carefully, and integrate its requirements into your welding procedure specifications. By doing so, you not only meet regulatory obligations but also guarantee the long-term integrity and safety of your clad components.
Unlike butt or fillet welds, overlay welding focuses on depositing a layer of filler metal onto a base material to improve properties like corrosion resistance, wear resistance, or hardness. Key Aspects of the Standard
Crucial for hardfacing to ensure the desired wear resistance is achieved. en iso 15614-7 pdf
Buttering (a layer deposited to isolate the base metal) requires specific tests under Clause 8 of the standard.
Measuring the hardness profile across the overlay, fusion line, and base metal to verify wear resistance and ensure the HAZ has not become excessively brittle.
I can provide specific insights into the required or qualification ranges for your exact setup. Share public link The process begins with creating a Preliminary Welding
If you are currently preparing for a welding procedure qualification or drafting a WPS for an upcoming project, let me know. Proposing a few ways to proceed, I can help you by: for overlay welding.
According to EN ISO 15614-7 , the following tests are typically required: To check for surface defects.
If you are familiar with EN ISO 15614-1 (the "standard for welding procedure qualification for arc and gas welding of steels"), you might wonder how Part 7 differs. Here is a quick comparison: Purchase the official PDF from a national standards
Because the mixing of the base metal and the overlay alloy (known as dilution) can drastically change the surface properties, standard butt-welding qualification rules are insufficient. EN ISO 15614-7 addresses these specific metallurgical challenges. Scope and Applications
| | Qualification Limits | |---|---| | Welding process | Restricted to the process(es) used in the test. When multiple processes are used, they must be applied in the same order as in the test. | | Welding position | Restricted to the position tested, except that position PC qualifies position PA (flat position). | | Type of current | Restricted to the specific current type (AC, DC, pulsed) and polarity used. | | Arc energy | For the first and second layers, variations must be within ±25% of the tested arc energy. For subsequent layers, only a +25% increase is permitted. | | Preheating temperature | Any decrease in preheat temperature below the tested value is not permitted. | | Interpass temperature | Any increase above the tested value is not permitted. Minimum temperature is the preheat temperature or tested interpass temperature, whichever is lower. | | Post‑weld heat treatment (PWHT) | PWHT is qualified within specific ranges of time, temperature, heating rate, and cooling rate. Any variation outside these ranges requires requalification. | | Number of layers | A reduction in the number of layers is not permitted. |
Crucial for preventing cracking in hardfacing applications and controlling metallurgy. Mandatory Testing and Acceptance Criteria
A hardness traverse profile (usually Vickers HV10 or HV5) is taken across the base metal, HAZ, fusion line, and throughout the overlay layers. This is especially vital for hardfacing to ensure wear resistance.
subgraph C [Examination & Testing] direction LR C1[Non-Destructive Testing (NDT)] --> C2[Destructive Testing] end