Shielding Gas for TIG Welding Mild Steel
1. Shielding Gas Type for TIG Welding Mild Steel
Just like TIG Welding Stainless Steel or other materials, Pure Argon is the ultimate TIG gas option to go for TIG Welding Mild Steel.
Other alternatives, including the gas mixture of Argon with Hydrogen or Nitrogen, are NOT recommended.
2. Setting Gas Flow for TIG Welding Mild Steel
Setting proper gas flow is also very important for TIG Welding Mild Steel, and is based mainly on your cup size and welding conditions.
If you perform MIG Welding Mild Steel with a bigger cup, or when you do it outside with windy conditions, you will need to increase your gas flow.
The optimal range of gas flow for TIG Welding Mild Steel is from 5 – 25 cfh.
The following table indicates the proper gas flow based on your cup size:
Table 1 – Gas Flow Setting based on Cup Size for TIG Welding Mild Steel
| Tungsten diameter | Cup Size | Gas Flow |
| 1/16’’ | 4, 5, 6 | 5 – 15 cfh |
| 3/32’’ | 6, 7, 8 | 8 – 20 cfh |
| 1/8’’ | 6, 7, 8 | 8 – 25 cfh |
Also, when TIG Welding Mild Steel, it is recommended to place your weld in an Argon bath.
Sometimes, you can purge the weld with a filler gas.