Selecting Filler Metals for Dissimilar Alloy Welding

Have you ever wondered what is the best filler metal for welding two different alloys together?

A common question I receive is the proper alloy filler metal for joining two dissimilar metals.  The difficulty is there is not normally one straight forward answer.  For example, when joining two different heat resistant alloys, there are several factors that are important.  The filler metal must match the strength, oxidation resistance, carburization resistance, etc. of both alloys.  If one alloy is clearly the higher (better) of the two materials, it is best to use a filler matching the chemistry of the higher alloy.  This gets complicated when one alloy is very strong and the other has better oxidation resistance.  Similarly with corrosion alloys, one alloy may be good in acid service and another good in chlorides.  Because there is much variation, there is likely at least two or three suitable options to join different materials.  Over the years Rolled Alloys has gathered information on weldability and performance to generate a list of filler metal options for dissimilar welding.  The best news is we have made this information available to you in our Weld Wire Wizard.  In general the options we give are from best to worst.  If you ever have questions about a specific environment please contact any of our applications engineers.