​Stainless Steel Tube Welding Tips and Techniques

Stainless Steel Tube Welding Tips and Techniques

Here are some essential welding tips for Stainless Steel Tubes (including square tubes):

Power Source Selection  

Use a DC power source with a flat (constant voltage) characteristic.

For DC welding, connect the electrode to the positive pole (wire to negative).

Suitable for 108×3 Stainless Steel Tube Welding

This method produces aesthetically pleasing weld seams with minimal deformation.

Shielding Gas Requirements

Use argon gas with 99%–99.9% purity.

Gas flow rate:  

8–10 L/min for welding currents of 50–150A.

2–5 L/min for welding currents of

Tungsten Electrode Extension

Optimal extension from the gas nozzle: 4–5mm.

For fillet welds: 2–3mm.

For deep groove welds: 5–6mm.

Keep the nozzle-to-work distance ≤5mm.

Preventing Weld Porosity  

Clean the weld area thoroughly to remove rust, oil, or contaminants.

Arc length recommendations:

2–4mm for carbon steel welding.

≥3mm for Stainless Steel Tube welding (excessive length reduces gas protection).

≥3mm 。

These techniques help ensure high-quality, defect-free welds on Stainless Steel Tubes.