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How do you weld austenitic cast iron by MMA (SMAW) welding?


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:
ISBN 0 85300 176 6

Guide for Welding Iron Castings - ANSI/AWS D11.2-89, American Welding Society, Miami, Florida, USA. e-mail:
ISBN 0 87171 295 4

See further information about Materials and Corrosion Management, or please contact us.

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