1. TIG Welding

2. Introduction
• Q: How many of you
have ridden a bike?
Did you know that it is
TIG welded? Have
you ever looked at
how it is held
together?

3. Introduction Cont.
• TIG welding is considered highly artistic.
The fine detail and quality of the welds
produced depend on the artist.
• However TIG welding is used to weld mild
steel, aluminum, and stainless steel.

4. TIG Welding
• In TIG welding an arc is
formed between a no
consumable tungsten
electrode and the metal
being welded. Gas is fed
through the torch to
shield the electrode and
molten weld pool. If filler
wire is used, it is added to
the weld pool separately.

5. TIG Machines
Foot Control
Ground torch
Regulator Argon 100%

6. Torch
Back Cap
Ceramic Tip
Tungsten Rod

7. Foot Control
• Practice controlling the
heat with the foot pedal to
see the weld puddle
increase and decrease.
Ideally, you want your
weld puddle to be about
1/4 inch wide. Keep your
puddle size consistent so
it doesn't grow, shrink,
spread or narrow while
you are welding.

8. Tungsten Types
• 2% Thoriated Tungsten – RED
Generally used for DC negative or straight polarity
applications, this is the most common type of electrode
used today. Provides excellent resistance from weld pool
contamination, easier arc starting capabilities and a more
stable arc. Contains 2% weight of thorium oxide (ThO2).
Most common metals used for include: Carbon and
Stainless Steel, Nickel Alloys, and Titanium.
• Pure Tungsten - GREEN
Used for AC welding applications. provide good arc stability.
Typically the least expensive tungsten, but is more
suitable to weld contamination than thoriated and
lanthanated. Contains a minimum of 99.5% weight
tungsten with no other alloys. Most common metals used
for include: Aluminum and Magnesium Alloys (AC).

9. Tungsten Types
• 2% Ceriated Tungsten -
Orange Used for AC or DC welding applications. An
excellent alternative to Thoriated tungsten especially in
low amperage welding. Takes approximately 10% less
current to initiate arc and has a very stable arc. Not a
radioactive material and tends to last longer than
thoriated. Contains 2% weight of Cerium Oxide (CeO2).
Most common metals used for include: Carbon and
Stainless Steels, Nickel Alloys and Titanium.

10. Most Common Tungsten Rods

11. Tungsten Rod Preparation

12. Torch and Filler Positioning

13. Welding Operation

14. Proper Clothing
• Long sleeve Shirt no frayed edges
• Cotton pants with no frayed edges
• Welding Gloves
• Close toe shoes
• Welding Helmet Not Automatic Shield
• Preferably 10 or higher due to bright arch

15. Lets Get Started
• Get dressed
• Get a welding helmet and meet me at the
set up station
• Demonstrate proper arc length, torch
angle, and filler rod feeding
• After shop-work, a quiz will be given over
the parts of the welder

16. Summary
• What is the importance of • 1. Properly prepared rods
a properly prepared focus the electrical
tungsten rod? current better making a
stronger more efficient
weld
• 2. it is important to know
• Why is it good to know
because the different
the differences in rod
metals it will weld and the
color and use?
preparation for them
• 3. almost in all welding
• How can tig welding be
applications
used?

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