5 Tips for Eliminating Back Purge in Stainless Steel Pipe
Back purge is a common problem that stainless steel pipe welders often encounter. It occurs when oxygen from the atmosphere enters the backside of the weld and causes contamination, leading to potential defects in the pipe.
However, by following these five tips for eliminating back purge in stainless steel pipe, welders can ensure a successful weld without compromising the quality of their work.
Use a Backing Gas System
Using a backing gas system can significantly reduce back purge issues. A backing gas system provides a flow of inert shielding gas, such as argon, to the backside of the weld. This system prevents oxygen molecules from contaminating the weld and helps prevent any defects or corrosion.
Purge Chamber
A purge chamber is a cost-effective solution that welders can use to eliminate back purge in stainless steel pipe. The chamber creates an airtight seal around the weld, ensuring an isolated, oxygen-free environment. This seal provides a clean weld and reduces the likelihood of defects.
Use a Suitable Filler Material
Using a suitable filler material can also help eliminate back purge issues in stainless steel pipe welding. Selecting a filler with a high chromium and nickel content, such as 308L, can improve the weld quality and reduce the number of contaminants in the weld zone.
Reduce Welding Speed
A common reason for back purge is trying to attain high welding speeds. Reducing welding speeds will increase the weld quality and reduce the likelihood of contamination through the backside of the weld.
Welding Position
The welding position also plays a role in eliminating back purge in stainless steel pipe welding. Welding vertically or in upside-down positions can help reduce the likelihood of contamination, as the weld pool can cover the backside, preventing any oxygen from entering.
Back purge can cause significant issues in stainless steel pipe welding, leading to potential defects and corrosion. However, welders can utilize various methods to eliminate back purge in stainless steel pipe welding. Using a backing gas system, creating a purge chamber, using suitable filler material, reducing welding speed, and choosing the right welding position can all significantly improve the quality of the weld. By following these tips, welders can ensure a successful weld without compromising the quality of their work.
SEC Industrial can help with automated pipe spool welding solutions to ensure a quality weld and eliminate back purge. The automated welding experts at SEC Industrial can provide the right solution. Contact us today for more information on our welding solutions.
