Absolutely! Welding aluminum cylinder heads is a common and effective repair technique, especially when you have a versatile TIG (Tungsten Inert Gas) welding machine in your shop. Most engine heads are made of aluminum alloys like A-356 or A-355, and TIG welding is the preferred process for these repairs.
The Benefits of TIG Welding Aluminum Heads
Having a TIG welder in your shop provides great versatility, as it can be used for a variety of weld repairs beyond just cylinder heads. TIG welding is the best process for aluminum castings like engine heads because it allows for precise control and high-quality welds.
Preparing and Welding Aluminum Heads
To successfully weld an aluminum cylinder head, proper preparation is key. This includes grinding the damaged area to expose fresh aluminum, cleaning the surface with an aluminum cleaner, and preheating the head to 350-500°F. The TIG welding process itself requires the right equipment, settings, and techniques to achieve a strong, durable weld.
Some important considerations when TIG welding aluminum heads include:
Using a powerful TIG welder with at least 175 amps of output
Selecting the right tungsten electrode size (typically 3/32″ or 1/8″)
Utilizing a gas blend of 75% argon and 25% helium for better arc performance
Maintaining proper torch angle and filler rod placement for optimal weld quality
Allowing the repaired head to cool slowly to prevent cracking or separation of the weld
With the right equipment, preparation, and welding techniques, aluminum cylinder heads can be effectively repaired using TIG welding, providing a cost-effective solution for engine rebuilders and mechanics.