Revision Question

To keep oxygen from being incorporated into the weld.

The molten weld metal can absorb small amounts of whatever gases are present. Oxygen, which is present I normal air, is undesirable. Purging with an inert (or other harmless) gas keeps the oxygen (or other problem gases) away from the weld.

In TIG inert gas is required.

Other wise, it would not be TIG.

Purging gas in inert.

Don't try to understand, just use it.

Not using it will not save you money. It will result in defective welds.

Look up purging gas on the internet.

Just curious, how much welding have you done in the past? Even a novice welder understands the importance shielding gases. It would do you no good if your inert gas line was filled/ contaminated with any other type of gas other than the shielding gases your going to weld with. And it doesn't matter what type of weld your doing, root or otherwise, contaminated gas = contaminated weld which sums up to a poor job,

SO, PURGE YOUR GAS LINE BEFORE STRIKING YOUR ARC