TIG welding uses argon gas.
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When performing TIG welding on pipes, argon is blown out from the welding torch; then why is it necessary to fill the pipe with argon as well? It is still sufficient to fill the tube with argon during the root welding; there is no need to fill the tube with argon for the intermediate filler layers.
It’s best to consult in person, as the information provided might be misunderstood; this is for reference only.
Because TIG welding achieves double-sided formation from a single-sided weld, the root pass also needs to be protected
When welding stainless steel or metals with highly reactive alloy components, argon shielding from the back is required to prevent oxidation. When welding titanium, a shield also needs to be used at the back of the welding torch for protection.
Anti-oxidation and cooling: the root temperature does not oxidize due to excessive heat when the cover is in place
Excessive temperatures during stainless steel welding can cause damage to the intergranular structure in the vicinity of the weld. Using an inert gas for protection can effectively prevent the metal from corroding and safeguard the metal layer against oxidation
If you take a close look at the torch tip used in TIG welding, the core in the middle is what generates the argon plasma flame, thereby enabling operation in high-temperature environments； The ring surrounding it (the thick tube) is used to provide an argon shielding environment; the amount of argon in the plasma torch is not sufficient to create a protective atmosphere during welding, so an adequate supply of argon must be added.
It relates to the welding materials; according to the specifications, argon shielding is required when the alloy content exceeds 5%