Why stainless steel pipe welding need purging?
Answer:
Both of the previous answerers are essentially correct. Internal purging with argon prevents the formation of high-temperature oxides on the root surface of the weld during welding, which could later flake off and contaminate whatever fluid is flowing through the pipe. Since stainless steel piping is often involved in transporting high-purity gases and liquids, this would obviously be undesirable.
My understanding is that the argon gas is used only during the welding process. This is a technique used with high purity fluid or gas delivery systems. I believe it prevents contamination internal to the weld.
When welding it makes a ash like substance. purging blows it out keeps it clean. I was a construction worker for six years I believe that's the answer.
The heat and air (Oxygen) react and create slag. Argon is inert and sheilds the weld, providing a good weld.
The answers post by the user, for information only, FunQA.com does not guarantee the right.
More Questions and Answers: