Arc Welding Underwater: How Welding is Done Underwater

Welding underwater is an essential process used in many industries including shipbuilding, energy production, and even in the aerospace industry. But what is arc welding underwater and how does it work? In this article, we’ll explore the basics of arc welding underwater, how it works, and the techniques used to do it effectively.

What is Arc Welding Underwater?

Arc welding underwater is a specialized welding process that allows metal to be welded in a water-filled environment. This type of welding is used in many different industries, particularly in shipbuilding and energy production, as well as in the aerospace industry. It’s important to note that welding underwater is a highly specialized process, and not all welders are qualified to do it.

How Welding Underwater Works

The process of arc welding underwater is very similar to welding in a dry environment. The main difference is that the welding is done in an environment filled with water. This is done using a method known as wet welding.

In this process, the welder will use a special welding machine that is equipped with a water jacket. This jacket is designed to protect the welder from the heat of the welding arc. The welding arc is created by electricity passing through a metal rod. This rod is then submerged in water and the arc is used to melt the metal.

TIG Welding Underwater

TIG welding is another specialized welding technique that can be used underwater. TIG stands for tungsten inert gas, and it is a type of welding that uses a tungsten electrode to create an electric arc. The arc is then used to melt the metal being welded.

TIG welding is more difficult to do underwater than arc welding because of the way the arc needs to be controlled. Unlike arc welding, TIG welding requires the welder to be able to control the arc in order to make sure the weld is smooth and void of any defects.

Advantages of Arc Welding Underwater

Arc welding underwater offers a number of advantages over other welding techniques. For example, it is much faster and more efficient than welding in a dry environment. The arc welding process also results in less heat distortion and warping, which can cause problems with the finished product.

In addition, arc welding underwater is much more cost-effective than other welding techniques. It requires less power to complete the weld and is much faster than other welding techniques. This makes it a much more attractive option for those looking to save money in their welding projects.

Safety Considerations for Arc Welding Underwater

Welding underwater is a dangerous process and it is important that all safety precautions are taken. The welder should always wear protective clothing, including a helmet and eye protection. It is also important to make sure that the welding area is clear of any debris or materials that could become a hazard.

It is also important to make sure that the welding machine is properly grounded and that the power source is properly protected. This will help to reduce the risk of electric shock. Finally, welders should be aware of the potential hazards associated with welding underwater and take appropriate safety measures to ensure their safety.


Arc welding underwater is an essential process in many industries and it is important to understand the basics of how it works and the safety considerations that need to be taken into account. Arc welding underwater can be a very cost effective and efficient way to weld in a water-filled environment, and with the right training and safety precautions it can be a safe and successful process.

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