Learn how shielding gas selection affects ER80S-B2 TIG and MIG welding, including arc stability, oxidation, penetration, transfer, and weld properties.
Shielding-gas selection depends on whether ER80S-B2 is used with TIG or MIG and on the qualified welding procedure.
What Gas Is Used for TIG?
High-purity argon is commonly used for GTAW/TIG. It provides stable arc starting and suitable shielding for root and fill passes.
Gas purity, flow rate, torch condition, cup size, wind protection, and trailing or back purging can affect results.
What Gas Is Used for MIG?
MIG procedures may use argon-rich mixtures with controlled additions of carbon dioxide or oxygen. The exact mixture influences:
- Metal-transfer mode
- Arc stability
- Penetration
- Spatter
- Bead profile
- Oxidation
- Weld-metal chemistry and properties
Can Pure CO₂ Be Used?
Do not assume so. A procedure designed for an argon-rich gas should not be changed to pure CO₂ without qualification and technical review.
What Are Signs of Poor Shielding?
- Porosity
- Heavy oxidation
- Unstable arc
- Excessive spatter
- Irregular bead shape
- Contaminated tungsten in TIG
- Inconsistent mechanical results
Can Gas Be Changed Without Requalification?
Gas composition may be an essential variable under the applicable code. Always check the WPS and qualification rules.
Dayang Welding recommends specifying the intended process and shielding gas when requesting ER80S-B2 product information.
