The physical properties of different types of stainless steels differ from each other and this phenomenon plays an important role in welding processes.
Austenitic chromium-nickel stainless steels are one-third that of unalloyed steels. This indicates that the heat will remain in the weld area for a long time, which causes some problems.
Chromium stainless steels generally have the same coefficient of thermal expansion as unalloyed steels. In austenitic chromium-nickel steels, this value is carbon and low-alloyed.