A Few Commonly Asked Purging Equipment Questions, Answered

No matter what you’re welding, it’s important to have a basic knowledge of purge equipment. Pipe Weld purging systems not only enhance the welding process, they ensure that oxidation cannot occur during or immediately after welding. Without this equipment, many of our nation’s bridges and buildings would literally fall apart.

Want to know more about the purging process and why it’s so important? Here are a few of the most frequently asked purge equipment questions, answered for you.

What flow rate should a welder purge at?
This is a pretty standard question, but the answer is a bit more complex. In truth, the flow depends almost entirely on the volume of material that needs purging. But a good rule of thumb to follow is that there should be enough flow to force oxygen out while maintaining a higher pressure within the purge chamber rather than outside of it. Doing this will ensure that oxygen can’t re-enter the purged area.

How long should the purging process go on?
Fortunately, this is a question that experience can usually help you answer over time. Purge monitors and other equipment simply takes practice to use properly! But if you’re one for exact science, there are a number of formulas that many welders draw from to determine just how long purging should go on for. Another accurate way to determine when to stop purging is looking at the oxygen sensor. When it displays a number below 70 PPM for stainless steel or below 50 PPM for titanium, your purging is generally finished.

How effective is purging before welding?
One of the best things about purging is how much estimation it takes out of the entire process. One of the most important results of the process is what is called a “clean weld.” This means that the weld is successful and lacking any kind of oxidation that might compromise its strength. Tools like Argon purge monitors can help you gauge just how effective a purge was without you having to closely inspect it.

Welding holds together much of our society. In fact, manufacturing accounts for almost two out of three welding jobs today. If you want to ensure you have a clean weld, don’t forget to check your purge equipment.