What documents do steel installers need to have?
Ask forFor nondestructive testing, liquid penetrant testing, the overall structure, verticality and levelness of packaging: packaging materials, packaging storage methods: the temperature and the humidity of the environment, transport, loading and unloading car placed in containers, display, etc..
Steel erection workers need at least welder certificate, electrician certificate and hoisting certificate.
Steel structure installation work requirements: structure; material, surface roughness, tolerances, surface treatment, straightness (or arc) connection; hole deviation, bolt grade; welding method, welding standard, welding materials; tightness requirements
