Interpass temperature: Max. 100°C. Heat input: Max. 1.5 kJ/mm. Heat treatment: Generally none (in special cases quench annealing at 1150 – 1200°C). Structure: Fully austenitic. Scaling temperature: Approx. 1100°C (air). Corrosion resistance: Maximum resistance to pitting and cervice corrosion in chloride containing environments. Good resistance in sulphuric and phosphoric acids contaminated by chlorides. Characteristics AVESTA P625 basic is a nickel base electrode intended for welding 6Mo and nickel base alloys. Due to its higher niobium content, compared to P12-R, P625 is well suited for welding nickel alloys such as Inconel 625 and Incoloy 825 for use in high temperature applications. P12-R has a fully austenitic structure which makes it somewhat more sensitive to hot cracking than for example 316L AC/DC. Welding should be performed taking great care about low heat input and interpass temperature.