As far as this certification does not cover metal fences, it represents the highest level of expertise in structural carpentry.ExC4 is the highest level of EN 1090 certification.ExC4 is required for the construction of large works: Bridges, Viaducts, Airports, Hospitals, etc.The highest level of certification in the welding process is required to be ExC4 certified:ISO 3834-2In order to obtain the highest level of certification in the welding process, it is necessary to use certified technicians who are experts in welding:
IWT or IWE.
IWT, International Welding Technologist, is an internationally licensed technician and can work under standard conditions with some limitations.
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