Key Factors Affecting Shielding Gas Efficiency in Thin-Walled Stainless Steel Tube Welding

Key Factors Affecting Shielding Gas Efficiency in Thin-Walled Stainless Steel Tube Welding

In TIG welding of thin-walled stainless steel tubes, proper shielding gas use is critical. Argon is easily disturbed by airflow, so several factors must be controlled to ensure weld quality:

1. Gas Flow Rate: Too low fails to protect; too high causes turbulence and air intrusion. Flow must match actual needs.

2. Nozzle Diameter: Larger nozzles expand coverage but may block view or access. Size should suit pipe thickness.

3. Nozzle Distance: Closer distance improves protection. For thin tubes, extending the tungsten electrode to 8–10 mm and setting the nozzle 10–13 mm away yields good welds.

4. Welding Speed & Wind: High speed or wind may shift the gas. Avoid outdoor work or use wind shields and steady motion.

5. Internal Purging: Before welding, purge pipes with argon for 10–20 seconds to remove air—full purge for small tubes, partial for large ones.

Controlling these factors ensures better protection and high-quality welds.