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Tungsten inert gas welding (tig)

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Title: PowerPoint Presentation - TIG Welding Introduction Author: Daniel Min Last modified by: Behzad Created Date: 1/28/2008 10:25:43 PM Document presentation format – PowerPoint PPT presentation

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Tags: gas | inert | tig | tungsten | welding

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Title: Tungsten inert gas welding (tig)


1
Tungsten inert gas welding (tig)
2
Background
  • What is TIG?
  • Tungsten Inert Gas
  • Also referred to as GTAW
  • Gas Shielded Tungsten Welding
  • In TIG welding, a tungsten electrode heats the
    metal you are welding and gas (most typically
    Argon) protects the weld from airborne
    contaminants

3
Background
  • TIG welding uses a non-consumable tungsten
  • Filler metal, when required, is added by hand
  • Shielding gas protects the weld and tungsten

4
Advantages
  • Welds more metals and metal alloys than any other
    process
  • High quality and precision
  • Aesthetic weld beads
  • No sparks or spatter
  • No flux or slag
  • No smoke or fumes

5
Disadvantages
  • Lower filler metal deposition rates
  • Good hand-eye coordination a required skill
  • Brighter UV rays than other processes
  • Slower travel speeds than other processes
  • Equipment costs tend to be higher than other
    processes

6
Safety
  • Electric shock can kill.
  • Always wear dry insulating gloves
  • Insulate yourself from work and ground
  • Do not touch live electrical parts
  • Keep all panels and covers securely in place
  • Fumes and gases can be hazardous to your health.
  • Keep your head out of the fumes
  • Ventilate area, or use breathing device

7
Safety
  • Welding can cause fire or explosion.
  • Do not weld near flammable material
  • Watch for fire keep extinguisher nearby
  • Do not locate unit over combustible surfaces
  • Do not weld on closed containers
  • Arc rays can burn eyes and skin Noise can damage
    hearing.
  • Wear welding helmet with correct shade of filter
  • Wear correct eye, ear, and body protection

8
Safety
  • Hot parts can cause injury.
  • Allow cooling period before touching welded metal
  • Wear protective gloves and clothing
  • Magnetic fields from high currents can affect
    pacemaker operation.
  • Flying metal can injure eyes.
  • Welding, chipping, wire brushing, and grinding
    cause sparks and flying metal wear approved
    safety glasses with side shields

9
Techniques for Basic Weld Joints
  • Arc Length
  • Arc length normally one electrode diameter, when
    AC welding with a balled end electrode
  • When DC welding with a pointed electrode, arc
    length may be much less than electrode diameter

Figure copied from TIG Handbook
10
Techniques for Basic Weld Joints
  • Arc Starting with High Frequency
  • Torch position on left shows recommended method
    of starting the arc with high frequency when the
    torch is held manually
  • By resting gas cup on base metal there is little
    danger of touching the electrode to the work
  • After arc is initiated, torch can be raised to
    proper welding angle

Figure copied from TIG Handbook
11
Techniques for Basic Weld Joints
  • Manual Torch Movement

Figure copied from TIG Handbook
12
Techniques for Basic Weld Joints
  • Manual Torch Movement
  • Torch and filler rod must be moved progressively
    and smoothly so the weld pool, the hot filler rod
    end, and the solidifying weld are not exposed to
    air that will contaminate the weld metal area or
    heat affected zone
  • When arc is turned off, postflow of shielding gas
    should shield the weld pool, electrode, and hot
    end of the filler rod

13
TIG Shielding Gases
  • Argon
  • Helium
  • Argon/Helium Mixtures

14
TIG Shielding Gases
  • Argon
  • Good arc starting
  • Good cleaning action
  • Good arc stability
  • Focused arc cone
  • Lower arc voltages
  • 10-30 CFH flow rates
  • Helium
  • Faster travel speeds
  • Increased penetration
  • Difficult arc starting
  • Less cleaning action
  • Less low amp stability
  • Higher arc voltages
  • Higher flow rates (2x)
  • Higher cost than argon

15
TIG Shielding Gases
  • Argon/Helium Mixtures
  • Improved travel speeds over pure argon
  • Improved penetration over pure argon
  • Cleaning properties closer to pure argon
  • Improved arc starting over pure helium
  • Improved arc stability over pure helium
  • Arc cone shape more focused than pure helium
  • Arc voltages between pure argon and pure helium
  • Higher flow rates than pure argon
  • Costs higher than pure argon

16
Welding Parameters
Aluminum weld parameters
Figure copied from TIG Handbook
17
Welding Parameters
Stainless steel weld parameters
Figure copied from TIG Handbook
18
Welding Parameters
Titanium weld parameters
Figure copied from TIG Handbook
19
Welding Parameters
Mild steel weld parameters
Figure copied from TIG Handbook
20
Tungsten Electrode Selection
Guide to selecting a tungsten electrode based on
amperage range
Figure copied from Guidelines to Gas Tungsten
Arc Welding (GTAW)
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