Page 192 - CITS - Welder - Trade Theory

WELDER - CITS

MODULE 7 : GTAW

Lesson 61 - 76 : Welding parameters and Tables &
data relating to TIG Welding.Tungsten

electrode, Types, sizes, and uses. coding

as per AWS

Objectives

At the end of this lesson you shall be able to
• describe the TIG welding parameter
• explain the TIG welding tungsten electrode
• explain the TIG welding tungsten electrode colour code.

Welding Parameters And Tables & Data Relating To

Tig Welding

The Typical type of current, Tungsten Electrodes and Shielding Gases for Welding Different Metal are show in
the Following table.

Types Of
Sl No Types Of Metal Thickness Electrode Shielding Gas
Current
PURE/
01 Aluminium All AC Zirconium Argon

PURE/
02 Magnesium All AC Zirconium Argon

03 Copper All DCEN Theoriated Helium
04 Stainless steel All DCEN Theoriated Argon
05 Titanium All DCEN Theoriated Argon

06 Nickel All DCEN Theoriated Argon
PURE/
07 Mild steel All DCEN Zirconium Argon

Tig Welding Tungsten Electrode
In TIG Welding the electrode should by definition to non-fusible tungsten whose weigh point is extremely high
in the metal 500 The electrode may be of pure tungsten tut is more generally of tungsten alloyed with thorium
cride (thorium ThO) of Zirconium side (Zacerium-ZO) or Cerium Oxide (CO ) or Lanthanum Oxide (La,O, The
2
electrodes are obtained in ground finish form se chemically cleaned and etched
Tungsten has a melting point of 3380° C and a boiling point of 5950° C. So that there is only Iittle Vaporization
in the arc and it retains it’s hardness when red hot. Thus these electrodes are virtually classified as non
consumable
Classification of electrodes

The following titles gives the electrodes available as per American Welding Society Classification AWS A 5
12-92

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