How to Connect Steel Pipes without Threads? Easy Ways

Connecting steel pipes without threads can be a challenging task. You can use numerous methods and procedures to connect pipes without threads. The most common method is welding, but this is not always the best option, especially if you do not have a welder or the necessary skills.

Other options are just as effective and do not require special equipment or training. In this blog post, we will explore some of the different ways that you can connect steel pipes without threads so that you can choose the best method for your needs.

What are Steel Pipes?

Steel pipes are large, hollow tubes, and they are made by passing a hot steel rod through a die, which gives the tube its shape. The tubes can then be cut to different lengths and used for everything from construction to plumbing. Steel pipes are strong and durable, making them ideal for high-pressure applications.

They are also resistant to corrosion, making them a popular choice for water and sewer lines. In addition, steel pipes can be easily recycled, which makes them an environmentally friendly choice.

Steel pipes are used in construction, water and gas distribution, and many other industries. Pipes made from alloy steel will resist corrosion due to their higher chromium content.

Steel is also much more durable than other metals, such as copper or aluminum, and is more difficult to break. Several types of piping are used in different industrial sectors: gas pipe, water pipe, steam pipe, electric wire cable ducting, etc.

What are Steel Pipes Used For?

Steel pipes are used in various industries but can also be found in construction and industry. They are made from steel and carry liquids such as oil and water. In transporting these liquids, the pipes become twisted and must be fixed. This is where the use of thread comes into play.

Threads are inserted into the pipes so that it is easier for them to move smoothly through them.

When a pipe is not threaded properly or has been opened up too much, it causes leaks in the pipes. A threaded pipe is very simple, but it needs some attention when it comes to its operation because it needs to be properly repaired or replaced if any damage occurs.

Steel pipes are one of the world’s most versatile and widely used construction materials. Due to their durability and strength, steel pipes are perfect for a range of applications, such as:

  • Supporting the weight of heavy structures, such as bridges and buildings;
  • Transporting large volumes of liquids or gases;
  • Creating underground utility tunnels; and
  • Carrying sewage and other waste materials away from populated areas.

In addition to their utility, steel pipes also have a long lifespan, making them a cost-effective option for both businesses and individuals. As a result, it is no wonder that steel pipes are such a popular choice for a wide range of construction projects.

How to Prep your Pipes Before Coupling

When establishing a connection between two steel pipes, it is essential to ensure that the pipes are properly prepared beforehand. Prepping will help to create a tight seal and prevent leaks.

  • The first step is to clean the end of each pipe with a wire brush to remove any dirt or debris.
  • Next, use a grinder to remove any burrs from the edges of the pipe. Once the pipes are clean and smooth, apply a layer of pipe coupling compound to each end. The coupling compound will provide a lubricated surface that will help to create a watertight seal when the pipes are joined together.
  • Finally, use banding straps or tape to secure the pipes while the coupling compound sets.

By following these simple steps, you can be sure that your pipes are properly prepared for coupling, and you can avoid any costly leaks or damage down the line.

Easy Ways to Connect Steel Pipes Without Threading

There are several ways to connect steel pipes without threading. Let’s look at the easiest ways DIYers find fun doing.

1) Flanges

Flanges are among the most popular methods for connecting steel pipes without threads. A flange is a disk-shaped fitting attached to a pipe’s end. This fitting has a hole in the center that allows another pipe to be inserted and connected.

Flanges are typically made from iron, steel, or aluminum and are available in various sizes and styles. To properly connect two steel pipes using flanges, you must weld them together. This method is strong and durable but requires some training and skills to be done correctly.

If you do not have access to a welder or do not feel confident in your welding abilities, this may not be the best option for you.

2) Slip-On Fittings

Another option for connecting steel pipes without threads is by using slip-on fittings. Slip-on fittings are similar to flanges in that they are attached to the end of a pipe and have a hole in the center. However, instead of being welded into place, slip-on fittings are held in place with bolts.

This makes them much easier to install than flanges and does not require any welding skills or equipment. Slip-on fittings are also very strong and durable, making them a great choice for those who do not have access to a welder or lack confidence in their welding abilities.

3) Compression Fittings

Another type of fitting that can connect steel pipes without threads is a compression fitting. Compression fittings consist of an outer sleeve and an inner sleeve. The inner sleeve is inserted into the end of the pipe and then compressed with the outer sleeve, which creates a seal. This fitting does not require welding or bolting, making it very easy to install.

However, compression fittings are not as strong as flanges or slip-on fittings and are not recommended for high-pressure applications.

4) Welding

As we mentioned, welding is one of the most often used techniques for connecting steel pipes without threads. Welding involves fusing two metal pieces with pressure and heat. This method is very strong and durable but does require some training and skills to be done correctly.

If you do not have access to a welder or do not feel confident in your welding abilities, this may not be the best option for you.

5) Brazing

Brazing is another method that you can use to connect steel pipes without threads. Brazing involves using a filler metal with a melting point lower than the base metals being combined to create a bond between them. This method does not require welding skills or equipment but requires some training to be done correctly.

6) Pipe Clamping

A pipe clamp is another method of connecting two steel pipes without thread. This is a simple and effective way. Begin by cleaning the ends of the pipes that you will be connecting. Then, align the pipes so they are flush with each other and place a pipe clamp around them. Finally, tighten the clamp until it is snug but not too tight.

7) Sealant

Using a sealant is effective in connecting two steel pipes. This method is best for small-diameter pipes or for connecting pipes that are not under high pressure. You may begin by cleaning the ends of the pipes you will be connecting.

Next, apply a bead of sealant around the circumference of one of the pipe ends. Then, push the two pipe ends together until they are flush, and the sealant forms a seal around the circumference of the joint.

Tips for Connecting Steel Pipes Without Threads

Threading is the most common way to connect steel pipes, but it’s not the only method. In some cases, threading can be prohibitively expensive or time-consuming, making alternatives like welding or flanging a better option. Here are a few tips for connecting steel pipes without threads:

  • If you’re welding, make sure to use an electrode compatible with the pipe’s material. This will help to prevent cracking and ensure a strong hold.
  • When using flanges, be sure to align the bolt holes carefully. Aligning the bolt holes will help prevent leaks and ensure the connection is secure.
  • If you’re using clamps, ensure they are rated for the pressure passing through the pipe. Checking the rate will help to prevent accidental leaks or breaks.

By following these tips, you can successfully connect steel pipes without resorting to threading.


Several methods can connect steel pipes without threads, including welding, slip-on fittings, compression fittings, brazing, and clamping. Each method has advantages and disadvantages, so choosing the best option for your needs is important.

For example, if you have access to a welder and feel confident in using it, welding may be the best option for you. However, if you do not have access to a welder or lack confidence in your ability to use one, slip-on fittings, compression fittings, brazing, or clamping may be better options.