There are many purposes to back purging for stainless steel. Purpose #1) Protection against rust to prevent corrosion. Purpose #2) Gas permeation–nitrogen helps remove moisture, which can cause corrosion when in contact with the metal surface. This…
I had a back purge happen while welding on a stainless steel pipe that I was trying to weld vertically. It caused me to lose my back purge gas shield, which was not good for me. I…
A weld test is a quality control measure for welds to meet the specification of the weld. A weld test can be done any number of ways, including ultrasonic testing or liquid penetrant testing. There are three…
The three primary types of weld tests include freehand, guided, and penetrant. A freehand weld test is one where the inspector looks at the weld with a microscope or through an optical device that magnifies it. This…
