Frequently Asked Questions
Austenitic flake graphite cast irons may be welded with a nickel iron electrode (AWS A5.15-90: ENiFe-Cl). This may also be used for welding the austenitic nodular cast irons although the choice of filler material is often more critical to obtain the requisite toughness and heat resistance. A Ni-Cu electrode has been used successfully, but a 20%Ni-Fe-Mg electrode has been developed to reduce cracking.
It is advisable to apply both preheat and stress relief in the welding of austenitic cast irons. Preheat of 320-330°C and post-weld stress relief of 600-620°C followed by slow cooling is appropriate.
All cast iron welding requires care. If in doubt, contact an experienced practitioner.
Further information is available in:
Welding of cast irons- a guide to best practice
C.L.M.Cottrell, 'Welding cast irons', published by TWI, Abington, Cambridge, UK, 1986 and available from Woodhead Publishing, Abington, Cambridge, UK. e-mail: firstname.lastname@example.org
ISBN 0 85300 176 6
Guide for Welding Iron Castings - ANSI/AWS D11.2-89, American Welding Society, Miami, Florida, USA. e-mail: email@example.com
ISBN 0 87171 295 4
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