A 4027 tig rod would be a good choice for casting aluminium welds. Because of its higher silicon content and for preventing porosity. Silicon is a deoxidizer which lowers the melting point of the aluminum alloys.A lower melting point would allow the filler wire to flow at a lower amperage.

Hey everyone, I initially pursued welding as a hobby but now I am looking forward to pursue it as a full time career. I am an amateur and I have still got lots to learn. Looking forward to get good advice and tips from here