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TIG Welding Introduction. 2 Background ► What is TIG?  Tungsten Inert Gas ► Also referred to as GTAW  Gas Shielded Tungsten Welding ► In TIG welding,

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Presentation on theme: "TIG Welding Introduction. 2 Background ► What is TIG?  Tungsten Inert Gas ► Also referred to as GTAW  Gas Shielded Tungsten Welding ► In TIG welding,"— Presentation transcript:

1 TIG Welding Introduction

2 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 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 4 Advantages ► Welds more metals and metal alloys than any other process ► High quality and precision ► Pin point control ► Aesthetic weld beads ► No sparks or spatter ► No flux or slag ► No smoke or fumes

5 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 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 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 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 9 Safety ► Welding current can damage electronic parts in vehicles.  Disconnect both battery cables before welding on a vehicle  Place work clamp as close to the weld as possible

10 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 ENBE Techniques for Basic Weld Joints Manual Torch Movement *Figure copied from “TIG Handbook”

12 12 TIG Shielding Gases ► Argon ► Helium ► Argon/Helium Mixtures

13 13 TIG Shielding Gases Argon ► Good arc starting ► Good cleaning action ► Good arc stability ► Focused arc cone ► Lower arc voltages ► CFH flow rates Helium ► Faster travel speeds ► Increased penetration ► Difficult arc starting ► Less cleaning action ► Less low amp stability ► Flared arc cone ► Higher arc voltages ► Higher flow rates (2x) ► Higher cost than argon

14 14 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


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