TIG Shielding Gas:

TIG Consumables - Shielding Gas (Argon)
TIG Consumables – Shielding Gas (Argon)

Welding gases provide a shield around the welding arc to prevent oxygen, nitrogen and hydrogen (contained in the air around us) from affecting the quality of the weld.

Topics:


The Different Types of TIG Shielding Gas:

With TIG welding, pure Argon gas will shield most materials, but there are some differences which are illustrated in the table below.

TIG Welding – Shielding Gases
TIG Welding – What Gas do I Use?
Sugested Gas Mixture Material
Carbon Steel Stainless Steel Aluminium (Alum’m & Copper Alloys)
Argon (100%) *** ** (All) **
Argon/Helium (70/30%) * * ***
Argon/Hydrogen (98/2%) *** (Austenitic only)
Argon/Nitrogen (98/2%) ** (Duplex only)
The more asterisk there are, the better it is.
Notes:
  • Each gas supplier, might have their own slightly different mix of gases (and their brand names for each different type of gas mixture). The table is intended to give you an idea on what gas you may need, and if a particular gas can be used across multiple types of materials.

The Size of Gas Bottle?

The size of gas bottle (and where you buy it from), may be dictated by a number of factors:

  • The Refill cost:
  • The Rental cost:
  • The Volume:
  • Portability:
  • Your Usage:

Each supplier will often have their own different sized gas bottles and rental agreement (if purchasing gas in larger quantities). It’s important to check the actual volume of gas supplied (under pressure), rather than the size of the gas bottle (cylinder). So how do you compare?

See the article on: How to Buy a Gas Bottle (opens in a new window).


How do I Connect the Argon Gas Bottle?

The Argon is connected to the TIG welder through a regulator. The regulator is a valve that screws into the top of the Argon bottle. It allows you to:

  • Open and close the flow of Argon gas.
  • Regulate the flow of Argon Gas.
  • It provides a connection point for the hose between the TIG welder and the Argon bottle.

The hose between the TIG welder and the Argon bottle is just a small, low volume hose. Hence the regulator provides a means of ‘stepping down’ the gas pressure for the gas supply to the TIG welding set.

A regulator is often supplied with one or two gauges. The first shows the bottle contents, the other will show the pressure of the Argon supplied to the TIG welder.


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