The argon arc welding of Aluminum alloy casting and workpiece is used as the filler material, special for 6061 and 6XXX series aluminum alloy, and 3XXX & 2XXX series aluminumalloy welding, widely used in ships,engine,chemistry,food,sports,uipment,mould,furniture,vessel,container,etc.
ER4043 aluminum & silicon is with high of crack resistance, but low plasticity, so for Plastic deformation joints after welding, we donor suggest it. You should strictly clean the oxide film on the edge of the workpiece and oil before welding, otherwise it will make bad weld produce and cause porosity, slag inclusion and other defects. Also you can use a plate to hold molten metal to ensure meld form.