Can You Weld Black Iron Pipe? Safety + Helpful Tips)


Black iron pipe has been a popular building material for years. From the unique look to the strength it has, it can be found quite frequently. As with many metals, knowing what can and cannot be welded can sometimes be confusing. This raises the question as to if black iron pipe can be welded and if it is even safe to do so.

Can You Weld Black Iron Pipe? Yes, black iron pipe can be welded through a process called arc welding. Arc welding uses high-pressure gas or electricity to bind the metals together. Although it can sometimes be mistaken for cast iron, it is actually made from steel, which is what allows it to be welded. Welding black iron pipe has no additional risks other than what comes standard with welding since the pipe itself has not been treated with zinc.

Welding any material comes with certain risks, but luckily black iron pipe is not one of the materials that increase potential toxic fumes. Let’s talk about how you can weld a black iron pipe and the precautions that you should take when working with this kind of material.

Can You Weld Black Iron Pipe? – Is It Safe?

Because black iron pipe is not galvanized with zinc, it is one of the many construction materials that can be welded. The coating that is on the outside of black iron pipe is actually an iron oxide coating. This coating is meant to protect it from corrosion and damage.

Black iron pipe is a kind of steel, which means that it can also be attached to other types of metals easier than you may think.

The lack of zinc in the material prevents additional toxic fumes from coming off of the material while in the welding process. While it reduces the poisonous fumes, removing the extra coating is an easy way to enhance the bond between it and another metal. As with all welding, you should use standard safety precautions to avoid bodily harm.

While welding black iron pipe, you should always clean the area that is to be welded. You can do this by using a wire wheel or a sander to clean the area. Although it is not necessary, removing the coating exposes more of the actual steel that it is made of, which can make it easier for you.

Just because black iron pipe is not galvanized does not mean that it is a safe material to work with. Shocks, burns, bodily harm, and toxic fumes are all part of the occupational hazards that welders face daily. Certain precautions, such as workspace guidelines and protective equipment, should always be followed to reduce the risks of harm while welding.

What Is Black Iron Pipe?

To know if you can weld something, you should always take the time to find out more about the material you are working with. Black iron pipe is technically just a steel pipe that has a coating applied to the outside. These are often found in water or gas lines, most often in older homes.

Black iron piping usually gives someone more options when it comes to combining them with different seams and fittings. The course coating helps prevent corrosion and keeps the outside of the pipe feeling cooler. One of the downsides of black iron pipe is that due to the seams, it can link more often than other forms of steel pipes.

Complete Guide to Black Iron Pipe Fittings >> Check out the video below

How is Black Iron Pipe Welded?

The easiest way to weld black iron pipe is by using a welding technique called arc welding.

1. After your black iron pipe and the metal you want to bond it to are clean from debris and dirt, they need to be clamped together as firmly as they can be.

2. Arc welding uses intense electricity to create a heat high enough to melt both metals together. This process can also be called stick welding if an electrode is used to create an arc where the electricity is coming from.

3. After putting on the proper safety equipment, test your welding gun on an area of the seam between the two metals.

4. This will often melt the two together instantly, which creates a bind of the two metals before working the whole seam.

5. Use the gun to travel down the seam of the metals, turning when needed, and this should create a bead where the two metals are connected.

6. After the two are cool enough to touch, they should be cleaned with a brush and any debris should be removed to keep the surface smooth and clean.

What is the Difference Between Black Iron Pipes and Galvanized Steel Pipes?

Galvanized steel pipes are what most builders use today because they are more durable, but black iron pipes are still standard in most stores and homes. Let’s talk about how they are different and why that difference is essential when welding.

The main difference between black iron pipes and galvanized steel is the actual process of galvanization. Although welding galvanized pipes are dangerous due to fumes coming from the process, they are more durable and come at a higher cost than a black iron pipe. Black iron pipes are more likely to erode due to not being treated, and they can also result in more leaks due to the seam.

Related reading: Why Is Welding Galvanized Steel Dangerous?

Black iron pipes are known for having a high resistance to heat, and they are seen in both sprinkler systems and carry cooling waters as well. Black iron pipe is more likely to rust, which makes it not ideal for carrying water, but it is still used because it is affordable and easy to find.

6 Step Process of Welding Black Pipe

The process of welding black pipe involves six steps.

First, the black oxide layer on the pipe should be removed with a grinder or wire brush before welding. Second, measure and cut the material to the desired length.

Third, fit and install the pipe in place. Fourth, tack weld the pipe to hold it in place.

Fifth, weld the pipe using any welding method used for steel such as MIG, flux core, TIG, and stick arc welding.

Sixth, proper preparation and cleaning procedures are important for better welding results. It’s important to note that some black pipe fittings made from malleable iron can be difficult to weld and should be brazed instead to avoid embrittlement.

Socket weld fittings made from forged steel can be used as an alternative for difficult-to-weld malleable iron fittings.

Can You Weld Black Iron Pipe To Steel?

Yes, you can weld black iron pipe to steel. Black iron pipe is made of mild steel and can be welded using MIG, flux core, TIG, and stick arc welding methods. It is commonly used in natural gas and propane lines, steam lines, and fire sprinkler systems.

However, it is important to note that malleable black-iron fittings are difficult to weld, making brazing or socket weld fittings better alternatives.

The welding process should involve good preparation and cleaning procedures to reduce smoke and fumes and produce better weld results.

What Is Black Pipe Coated With?

Black pipe, also known as black iron pipe, is coated with an iron oxide layer that protects the mild steel from rusting.

This coating is safe to inhale during welding, making it easy to weld using various welding methods such as arc welding, MIG welding, flux core welding, and TIG welding. It is commonly used in gas transport, water transport, decorative pieces, safety and recreation purposes, and more.

However, it is important to note that some black pipe fittings are made from malleable iron and can be difficult to weld. In such cases, socket weld fittings made from forged steel are a readily available alternative in various sizes.

Proper preparation and cleaning procedures are crucial for better welding results.

Is Black Iron Pipe the Same as Black Steel Pipe?

No, black iron pipe is not the same as black steel pipe. Although both are forms of steel pipes, black iron pipe is made from more malleable metals, while black steel pipe is made from a harder and less malleable metal.

Additionally, the two differ in their construction, with black iron pipes having seams and connectors for easy connection, while black steel pipes are usually welded.

Black iron pipes are commonly used for gas and water transport, as well as for decorative and safety purposes.

What Grade of Steel is Black Iron Pipe?

Black iron pipe is made of a low-grade “mild steel” compound, which gives it better corrosion resistance than traditional cast iron piping.

The spec for black iron pipe is ASTM A 120.

Is Black Iron Pipe Strong?

Yes, black iron pipe is strong and durable, making it a popular choice for a variety of applications. The mechanical strength of black iron pipe is sufficient to handle high-pressure applications, such as gas and water transport, as well as for structural purposes.

However, it’s important to note that some black pipe fittings made from malleable iron can be difficult to weld and should be brazed instead.

When using black iron pipe for structural purposes, load testing should be done to ensure the threaded ends are not a weak point.

How Long Does Black Iron Pipe Last?

The lifespan of black iron pipe can vary depending on environmental factors, maintenance, and usage. Black iron pipe is made from more malleable metals and has seams and connectors, unlike black steel pipe, which is made from a harder and less malleable metal and is usually welded.

Black iron pipe is strong and durable, making it suitable for high-pressure applications and structural purposes. However, some fittings made from malleable iron can be difficult to weld and load testing should be done for structural use.

Unfortunately, there is no specific lifespan for black iron pipe, but with proper maintenance and care, it can last for several decades or more.

What are the Risks of Welding With Black Iron?

The general risks that come with welding black iron pipe are similar to different welding materials. The lack of zinc in the coating means that there are not as many toxic fumes as there could be, but that does not imply that welding this material is completely safe.

With welding, there are dangers with working with the welding gun and even the materials. Black iron pipe should be treated just like any other material to stay as safe as you possibly can while working on it.


When it comes to welding, shock is one of the most common and dangerous risks that a welder can face. Not only can there be an issue with the equipment that is being used, but wet or dirty working conditions can also cause accidents to happen as well.

Shock can also occur through protective gear, and some welding items have different voltages which the user should be well-trained in prior to use.


Even though black iron pipe does not have the same toxic fumes that come from galvanized pipes, there are still a considerable amount of fumes and gases that can have a negative impact on your health.

The area you are working in should have clearly defined areas where you need ventilation equipment and areas that are safe to breathe freely in. If you are working in the same room as someone else, the material they are working with could give off fumes.


The most glaring risk of welding is the risk of bodily injury. Exposure to high-pressured gases and intense heat are frequent in a welding environment. Without the proper protective gear, workers can be exposed to injuries such as cataracts, welder’s flash, and even potential blindness. Sparks and fire are both events that can happen in welding, which can result in burns or metal debris from tools or materials being worked on.


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David Harper

David is the Co-Founder and Senior Editor at David's an experienced fitter and tuner/welder who's passionate about helping others develop in life through new skills and opportunities.

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