This tends to compromise the strength and integrity from the joint. To avoid porosity, clear away the zinc coating in the weld region. We clearly show 29 in stock Note: Your Order is for more than We've in stock. We will supply an estimated shipping date when We've that information https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html