How To Weld Aluminum Heads. Clamp up the tubing and start heating the aluminum with a propane torch. Then set the amperage of your welder aim at the aluminum pieces and press the button on the torch.
A little WD40 sprayed on the bit will help keep the aluminum from sticking to the bit. Then set the amperage of your welder aim at the aluminum pieces and press the button on the torch. The head must be clean grease-free and dry before grinding out the crack.
Clamp up the tubing and start heating the aluminum with a propane torch.
To weld aluminum clamp the aluminum pieces together tightly and use a propane torch to preheat them to a temperature between 300F and 400F. Ive been researching tonight and it seems that most cylinder head repairs say 200-400F helps so barring any better suggestions Ill probably preheat to somewhere between 300-400 and hope to be 250 while welding. Typically youll use a 332-diameter tungsten. As most engine heads are aluminum A-356 or A-355 castings TIG welding is the best process.