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Sunday, July 26, 2020

TIG Welding

Tungsten Inert Gas (TIG) Welding

TIG Welding is also a slang term commonly used. Tungsten inert gas welding (TIG welding) is a gas shielded welding process and is one of the fusion welding processes. TIG welding’s proper name is Gas Tungsten Arc Welding or “GTAW". This is the name the American Welding Society and other welding organizations refer to this process on their welding procedures. TIG welding also goes by the term HeliArc welding.

When TIG welding was introduced around the 1940’s Helium gas was the primary shielding gas used in process. The term Heliarc welding was the common phrase used back in the day Most old timers and veteran welders refer to TIG welding as Heliarc welding.

Since the name includes the term “Tungsten" and tungsten is what makes TIG welding possible, it is good to know what tungsten is! Tungsten is a very hard, slightly radioactive, and brittle metal. At 3380 degrees Celsius, tungsten has the highest melting point of all pure metals in the periodic system. This means that the electrode does not melt when it emits an arc that heats and liquefies the material. In TIG welding the tungsten is made into a non-consumable electrode that is used to create the arc for TIG welding.

THIS IS HOW A TIG WELDING SYSTEM IS STRUCTURED:
(1) Mains connection
(2) Power source
(3) Hose pack
(4) Grounding cable
(5) Welding torch
(6) Ground terminal
(7) Workpiece
(8) Filler metal
(9) Shielding gas

TIG welding requires three things, heat, shielding, and filler metal. The heat is produced by electricity passing through the tungsten electrode by creating an arc to the metal. The shielding comes from a compressed gas cylinder that flows to the weld area to protect it from air. The filler metal is just a wire that is dipped by hand into the arc and melted.

TIG Welding is a manual welding process that requires the welder to use their both hands to weld. When TIG Welding one hand is used for holding the TIG torch that produces the arc and the other hand is to add the filler metal to the weld joint.

Shielding gas is selected according to the material being welded. Argon - the most commonly-used shielding gas. Helium and helium/argon mixtures - adding helium to argon will raise the temperature of the arc. This promotes higher welding speeds and deeper weld penetration.

In the TIG welding process the arc is formed between a pointed tungsten electrode and the workpiece in an inert atmosphere of argon or helium. TIG welding must be operated with a drooping, constant current power source - either DC or AC.

ADVANTAGES OF TIG WELDING
No formation of welding spatter
Particularly high optical quality of weld seams
All welding positions are possible
Very high weld seam quality

DISADVANTAGES OF TIG WELDING
Requires high degree of skill
Low welding speeds
Rust must be removed without fail when preparing the weld seam
Not suitable for thick workpieces

2 comments:

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Danny said...

It is really awesome and informative post for welding. You can choose different brand from welding equipment store. You can also get quality safety equipment for welding at a comfortable rate.

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