TIG Welding

TIG Welding

1. Electrodes

   • Thoriated
     • Radioactive
     • colour coded red
     • 1.70-2.20%
   • Ceriated
     • Colour coded orange
     • 1.80-2.20%
   • Zinconiated
     • coour coded brown
     • 0.15-0.40%
   • Pure tungsten
     • Colour coded green
     • 100% tubgsten
   • Lanthanated
     • colour coded gold
     • 1.30-1.70%
   • Rare earth
     • colour coded grey
     • unspecified percentage

2. Health & Safety

   • PPE
     • Boots
     • Overalls
     • Gauntlets
     • Head shield
     • Safety goggles
   • Bystander safety
     • Curtians
     • Warning people around you

3. Filler wire

   • Carbon steel
   • stainless steel
   • Aluminium
   • Filler wire must be the same as base plate material

4. Arcing methods

   • Scratch star
     • Where you scratch the material surface to initiate the arc
   • LIft
     • Where you touch the electrode to the material to start the arc, once started lift electrode to maintain the arc
   • High frequency
     • Uses a high frequency to jump the gap and initiate an arc

5. Advantages

   • Quiet
   • Clean
   • Can weld materials other processes cant
   • Welder is in control of wire feed and amperage during welding
   • Can weld on AC negative

6. Disadvantages

   • Expensive
   • Time consuming
   • Not easy to do
   • Cant weld AC positive

7. Shielding gases

   • Argon
   • Helium
   • Argon heliummix
   • Hydrogen