GTAW is an arc welding process utilizing a non-consumable tungsten electrode and inert gas to protect molten puddles. Originally developed for welding magnesium it is now utilized for a wide variety of metals. GTAW gives you a very high degree of control over the molten puddle. You will see this process used widely in many industries such as food processing equipment, casting repair, aerospace, spacecraft, and more.

The weld machine can have a wide variety of settings to help with puddle manipulation, arc shape and even cleaning. Use direct current straight polarity for most welding and alternating current for aluminum and magnesium.

The type of gas or mix of gas you use will affect the penetration of your weld. Argon (heavier than air) is the most common. Helium (lighter than air) will create a hotter puddle and can be mixed with argon for a desired effect.

The type of tungsten you use can be a personal preference as there are many alloys of tungsten. Pure Tungsten is for AC welding with a transformer-type welding machine.

Cleanliness and fit-up are incredibly important and should not be taken lightly.

This chapter is simply the tip of the iceberg when it comes to GTAW. If you are a hobbyist or plan to make a career of GTAW I hope this has helped you on your path.