Hobart Aluminum Welding Wire is a general purpose type aluminum welding wire that contains silicon additives which result in improved fluidity wetting action of the weld pool and also produces a weld less sensitive to cracking. Bright weld finish makes it a popular choice of welders. Can be used to weld various grades of aluminum. Weight lbs. 1, Welding Processes Aluminum welding, Compatible With MIG welders, Product Type Welding wire, Wire Material Aluminum, Wire Size in. 035.