Yes, many options these days. With aluminum, cleanliness is critical. For years I had a old school welder person who would sandblast the area clean, pre heat the head and weld it with a torch! Amazing, the welds always came out well and worked fine. These days TIG is preferred and MIG welders (a little less precise than TIG) can also work. Naturally the welder person doing the job must have the experience to know what gas, settings and electrodes or rods to use. Choose a method which will generate the least amount of warpage to the head. Pre-heating and clamping the head down flat may help. In any case, the head will need to be milled flat and smooth after the welding is complete since some warpage and build-up will occur.
