Just to add a detail, during welding do not allow that your component temperature fall below the martensitic start temperature Ms if you are going to use multipass technique until all the welding is finished, then cold slowly below Mf in order to finish the martensitic transformation, then temper your welding.
Sergio Muñoz Pinzón
IWE-IIW
http://Weld-ING.blogspot.com
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