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How do you weld spheroidal or nodular cast iron by MMA (SMAW) welding?


Frequently Asked Questions

Preheat is advisable for all but the simplest of castings or thinnest of sections in the ferritic grades. A preheat temperature of 100 - 200°C is required for thicker and more complex ferritic grades, and the normalised, pearlitic or hardened and tempered grades may require at least 250°C. In cases where high welding stresses may develop a preheat of 320 - 330°C may be necessary.

After fabrication, the only post weld heat treatment generally applicable is a stress relief heat treatment at 600 - 620°C, followed by slow cooling.

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

A Practical Guide for the Welding of S.G.Iron, British S.G.Iron Producers Association Ltd, London

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

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