Where does it occur?- Weld corrosion affects vessels, pipe work and structural materials.- At / Adjacent to welds.- Internally & Externally.- Regardless of orientation and geometry.- In hard welds.- At over protected welds (CP).- At poorly made welds

PolicyTo assure the continued integrity of all sites minimising risk to personnel, environment and business from the threat of Weld Corrosion.

Strategy- Planned maintenance / inspection routines- Immediate action on non- conformance- Involvement from key personnel- Corrosion risk assessments- Risk based inspections

What can be

done to prevent

it?- Choose appropriate welding method and filler material.- Stringent control of weld quality.- Report any degradation/leaks, seeps & weeps when you find it and ensure immediate action is taken.- Effective planning of change outs, mitigations, maintenance and other policies/strategies.

When & Why does it

occur?When geometry is conducive to crevice attack, in corrosive environments, when there is a galvanic difference, incorrectly heated or heat treated welds (stainless steels), or if there has been a deviation from standard welding procedures.

FactsCorrosion takes place preferentially at welds because: - Microstructure / composition differences in weld and parent can cause galvanic corrosion - Poor weld quality; a. weld undercut causing crevice corrosion b. weld profile, e.g. root penetration causing local turbulent flow and erosion corrosion- Cathodic overprotection of Duplex Stainless Steel welds causing cracking- Sour cracking in hard welds.