The standard classifies execution classes (EXC1 to EXC4) based on the consequence of failure. For example, EXC3 applies to structures in seismic zones or with high fatigue loads, demanding additional inspection and tighter tolerances.
A key requirement is the Welding Coordination Plan (WCP), which must specify joint details, welding processes, preheat, interpass temperatures, and PWHT parameters. The WCP serves as the single reference for all shop and site welding.
Auditors typically check that the WCP is approved before fabrication begins and that all deviations are documented. Non-compliance can lead to rework or structural failure.
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Source: EN 1090-2, 2018