![]() I found it when I would UT the joint and uncover it when the welder was cutting it out. What I had called piping porosity didn't always exit to the surface to where you could visually inspect it. Rackengr, I may be confused on the term "piping porosity". Is this the type of info you were in question about? John Wright If you leave too large a (root) gap on a fillet weld, atmostphere can be drawn in and contaminate the weld pool from behind and the shielding gasses cannot cover the weld pool to prevent this from happening. I have seen piping porosity at the root of a weld due to improper fit-up of the joint. ![]() Also welding processes that use an external shielding gas can cause porosity if the gas flow is too little or too great to properly cover the weld pool. Low Hydrogen rods after they are out of the original packaging must be kept in a rod oven at 250F to keep the moisture content low hence the name low-hy. Porosity(piping or linear, cluster, and randomly scattered) usually comes from moisture, grease contaminates on the surface of the base metal or from the consumables that have been contaminated. ![]() Piping porosity will most likely(not always) be parallel to the weld joint. Piping porosity is where gasses have traveled through the molten weld metal pool and caused what some refer to as worm holes. ![]()
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January 2023
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