Joining Two Steel Pipes

There are numerous methods for joining metals without welding.

Joining two steel pipes.

The valve shown has 1 2 in. There are three main methods of joining pipes together and attaching fittings to them. Some of these alternatives to welding methods require heat while some don t require heat at all. Committee of stainless steel producers american iron and steel institute 1133 15th street nw washington dc 20005 u s a in co operation with asm international formerly american society of metals metals park oh 44073 u s a.

The photo shows how to use common plumbing parts to join a new ball valve and a flexible stainless steel connector to steel pipe. Two union nuts and a ring nut. Pipe joining methods soldered this is the process of joining pipe by melting a filler metal with a low melting point into a joint. Make sure the pipe joint compound or tape go into the threads to ensure a water tight connection.

The ring nut acts to join the two pieces. Read the instructions on the type of fitting you re using to see how far the pipe needs to be inserted and make a mark on the pipe at that length to ensure. The union nuts attach to the replacement sections of pipe where they join together. Connecting together galvanized pipes that are non threaded uses a coupling that creates a sealed joint.

In each description we will list the different plumbing systems and which pipe joining methods apply and finally the benefits and drawbacks of each. Galvanized pipe has a zinc coating that is either rough or smooth depending on the type of zinc and steel heating process. Even though push fittings are easy you still have to do your homework. When the filler metal cools it bonds the two pieces of metal.

Coat all threaded pipe connections with pipe thread compound before assembly. Smaller lines are usually joined by socket welding or screwing. The union is a fitting that consists of three components. Start by liberally coating the threads of the pipe with pipe dope or wrapping the threads with ptfe tape.

Lines of 2 inch or larger are usually butt welded this being the most economic leak proof method. Subsequent to the symposium asm international published a book joining of stainless steels. This is probably one of the easiest methods of joining pieces of metal or anything together. Read down below to find out how to join two pieces of metal without welding.

Screw both sections of pipe into their respective fittings. It is important to know the type of coupling to use for galvanized pipe and the fitting procedure so the pipe is leak free. Insert the ring nut over one of the sections of pipe.