This may compromise the energy and integrity of your joint. To prevent porosity, get rid of the zinc coating while in the weld space. Put a coupling bolt on Each and every bolt hole and tighten the coupling bolts utilizing a wrench or socket wrench. Ensure to tighten the bolts https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html