When you notice brown stains with your sink or bathtub, you may have iron within your h2o, which could be due to galvanized pipes. In summary, welding can be a reliable and effective system for connecting galvanized pipes with no threads. Arc welding and gas welding are two usually utilised https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html