Gas Tungsten Arc Welding
(GTAW or TIG)
Gas Tungsten Arc Welding
Effects of Polarity
Gas Tungsten Arc Welding
Advantages
• Superior quality welds,
generally free from spatter,
porosity, or other defects
• Precise control of arc and
fusion characteristics
• Weld almost all metals
• Used with or without filler wire
• Easily automated
• Used in all positions
• Intricate geometries weldable
Gas Tungsten Arc Welding
Disadvantages
• Less economical than
consumable electrode
processes for sections
thicker than 3/8 inch
• Lowest deposition rate of
all arc processes
• Tungsten inclusions
• Higher operator skill
Required
• Sensitive to drafts