Can You Weld Black Iron Pipe? – A Complete Guide

If you are new to welding, you might be wondering whether you can weld a black iron pipe. You might even be wondering what this pipe is in the first place. In this article, we define briefly what a black tube is and discuss whether or not you can weld this kind of pipe.

What is a Black Pipe?

Interestingly, a black pipe is an ordinary iron pipe but colored black. The black color is the outcome of the iron oxide that forms on the surface of the metal during manufacturing. Usually, these pipes are used to transport propane gas and natural gas in residential applications. This pipe is made seamless, which accounts for its preference as a better option for gas transportation as well as fire sprinkler systems.

This type of pipe hot-favorite metal among welders is easy to use to create projects and fittings found at local home improvement stores and scrap piles. With threaded connections and a choice of sizes, it’s easy to create projects from the black pipe and fittings found at home improvement stores or in scrap metal piles.

Its unique feel and appearance add a great vintage/industrial look to any plans but do you have any idea what the black coating is? Let’s find out what black iron pipe is all about.

Welding black iron pipe

Yes, You can weld black “iron” pipe because it’s made of mild steel, not iron. Black steel pipe can be welded using any welding method used for steel. This includes MIG, flux core, TIG, and stick arc welding.

But black-pipe fittings are made of malleable black iron. Black-iron fittings are difficult to weld without causing damage to the fitting.

What is a black metal pipe?

Often mistaken for cast iron because of its heft and dark appearance, they make black steel pipe of mild steel. It’s usually low-grade and not galvanized.

With good corrosion resistance and strength, they commonly use black pipes for natural gas and propane lines, steam lines, and fire sprinkler systems.

The phrase “black steel pipe” is a generic term rather than a specification. It’s used in the trades when referring to regular steel pipe rather than galvanized steel pipe.

The ASTM (American Society for Testing and Materials) published the A53 standard that covers carbon steel pipe specifications.

What is the coating on black steel pipe?

The manufacturing process results in a dark iron oxide coating on a black steel pipe. This coating improves corrosion resistance over bare metal.

To further inhibit rust, manufacturers may use a variety of coatings such as coal tar enamel, lacquer, and oil.

Is it safe to weld black pipe?

Yes, because the black pipe isn’t galvanized with zinc, there’s no risk of creating poisonous zinc-oxide fumes while welding. Normal safety precautions are sufficient.

Removing mill-scale and other manufacturing coatings (inside as well as outside) is a good practice to reduce fumes and ensure a quality weld. It’s always a good idea to provide adequate ventilation and use a respirator.

What are the Risks of Welding with Black Iron?

The general dangers that accompany welding black iron channels are like distinctive welding materials. The absence of zinc in the covering implies that there is not the same number of poisonous fumes as there could be, however, that doesn’t suggest that welding this material is safe.

With welding, there are risks with working with the welding gun and even the materials. Black iron pipe ought to be dealt with simply like some other stuff to remain as sheltered as you can while taking a shot at it.


With regards to welding, shock is one of the most well-known dangers that a welder can confront. Not only can there be an issue with the hardware that is being utilized, but wet or messy working conditions can also lead to mishaps.

Shock can likewise happen through defensive apparatus, and some welding things have various voltages that the client ought to be all around prepared in preceding use. Of course, nobody wants to get this kind of experience in the course of duty.


Even though the black iron pipe doesn’t have the equivalent harmful fumes that originate from stirred channels, there is as yet a lot of vapor and gases that can negatively affect your well-being.

The area you are working in ought to have unmistakably natural regions where you need mask ventilation and zones protected from breathing freely. If you are working in a similar room as another person, the material they are working with could emit fumes.


The most glaring danger of welding is the danger of real injury. Presentation to high-compelled gases and extraordinary heat are visited in a welding domain. Without the best possible defensive rigging, Labour can be presented to injuries, for example, waterfalls, welder’s glimmer, and even likely visual deficiency.

Starts and fire are the two occasions that can occur in welding, which can bring about consumes or metal flotsam and jetsam from instruments or materials being dealt with.

It is getting rid of mill-scale plant scale and other assembling coatings (inside just as outside) is a decent practice to decrease fumes and guarantee a quality weld. It’s consistently a smart thought to give sufficient ventilation and utilize a respirator.

Welding Black Iron pipe – Step-by-Step Guide

  • After your black iron channel and the metal, you need to bond it to is spotless from garbage and soil. They should be cinched together as solidly as they can be.
  • Bend welding utilizes exceptional power to create heat sufficiently high to liquefy the two metals together. This procedure can likewise be called stick welding if a terminal is used to make a circular segment where the power is coming from.
  • Test your welding firearm on a region of the crease between the two metals after putting on the correct well-being hardware.
  • This will frequently dissolve the two together immediately, which makes the difficulty of the two metals before working the entire crease.
  • Utilize the gun to go down the ridge of the metals. Turn when required, and this ought to make a globule where the two metals are associated.
  • After the two are sufficiently cool to contact, the surfaces should be cleaned with a welding tool brush, and any debris should be removed to keep the surface smooth and clean.

As you can see from the above, welding black iron pipes is not rocket science. You’ll produce a pleasant and professional weld quite quickly as long as you use the right tools and procedures.


Surface preparation is important when welding “black iron pipe”. By its very nature, it has a lot of “stuff” on its surface.

Since it is just mild low carbon steel it has a lot of forgiving properties that allow you to weld on it with average skill levels. But if it is going into gas-carrying service and not ornamental surface then really pay attention to codes and ticket requirements.