By -
Date 12-30-2005 20:31
Dave,
Without knowing all the details, I think the preheat is more beneficial to the resistance of solidification cracking than sensitization in this case. With the difference of electrical conductivity between a CS and a SS, the cracking problem, or possibility of such, is a greater concern since a normal welding cycle is normally too short to incur sensitization or sigma. Actually, when welding 2 materials with such a greater thickness, it is advisable to retard the cooling rate to benefit the thinner SS. I would advise that you proceed and not worry about cracking or IGA. Thank you, and also I wish you a very Happy and prosperous New Year.
Chuck