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Hi, this is ethanethan. I have knowledge of EN 1090 EXC4, which is the highest execution class under EN 1090 for structural steel and aluminium components used in extremely complex and safety-critical applications. It requires the most stringent control over fabrication and welding processes, including highly qualified personnel, rigorously approved welding procedures (WPS/WPQR), and the highest level of inspection and testing.
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