We have asked a few times about welding high carbon steels. Whilst the process is not as staightforward as welding mild steels (below 0.25% carbon), it is possible to weld with some preparation. Alternative methods should be considered, but if this is not possible, some guidance can be found below.
The main consideration is the preheating of the joint to avoid producing a brittle joint. The temperature required increases with the percentage of carbon present in the steel. Most steels used for the production of springs will have a carbon content between 0.65 and 0.85% percent, although 0.50% carbon steel is commonly used for heavy duty springs with high thicknesses.
For the higher carbon steels temperatures from 300-320oC are recommended. it may also be advisable to employ a method of slow cooling post welding to avoid embrittlement.
Following are a number of links with further information:-
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