Welding Aluminum To Steel. Welding Aluminum to Various Metals There is a wide difference of melting temperatures for aluminum approximately 650C and for steel approximately 1538C. Aluminium and steel can not be joined by conventional welding processes.
Bimetallic transition materials are available commercially in combinations of aluminum to such other materials as steel stainless steel and copper. They facilitate the joining of dissimilar metals by welding. The two most common methods of facilitating arc welding of aluminum to steel are bimetallic transition inserts and coating the dissimilar material prior to welding.
Through the process of arc welding aluminum would be in a liquefied state by the time the steel begins to melt.
This is due to their differences in expansion coefficients thermal conductivities metal melting points plus the ability to develop fragile intermetallic compounds. Hydrogen is very soluble in liquid aluminum. Instead they are welded to the part of the insert made of the same metal. Can steel be welded to aluminum.