MIG Welding Definition and Terminology

By ced •  Updated: 07/16/21 •  6 min read

MIG Welding is a popular technique used in welding. This technique is used because of its ease and speed. It can be used for many types of metallic materials like steel, aluminum, and copper. It also has a wide range of applications so it will be good to know the proper terms and application for welding MIG Welding.

What is MIG Welding?

MIG (Metal Inert Gas) welding is one of the most common welding techniques used today. The MIG welder consists of an electric arc generator, gas supply regulator, gas nozzle, filler material tank, gas supply hose, air hose and a control box or panel. The process involves using an electric circuit to produce heat in the form of an arc.

The MIG welder is usually powered by electricity and controlled by a control panel or the remote controller. The welding process starts by using an air compressor to fill the gas tank with inert gas for your work area. Make sure that you have a supply of inert gas for your work area because it is essential to the welding process. After filling up the tank, check on the flow of your supply hose, and make sure that it is not too tight or too loose. You can then place your welding mask over your nose and mouth to protect yourself from any sparks of the welding machine while adjusting the voltage on the welding machine.

The MIG welder has three different voltages, which are 20, 40, and 80 volts. The 20-volt machine is the most commonly used for welding because it produces the most heat and has a good range when compared to other machines. The 40-volt machine has a higher heat output and is more suitable for thicker metal while the 80-volt machine is used in large scale operations where there are many pieces of metal to be welded.

The MIG welder will then produce intense heat that can easily melt or burn the metal you are working on. On certain occasions, you may have to stop welding due to overheating or if you accidentally hit the trigger. While welding, make sure that you keep an eye on your supply hose, as well as your control panel. You must also make sure that you put on your welding mask and gloves. The most common type of welding MIG welder comes with an automatic feed system, which means that when you hit the trigger, it will automatically start feeding the wire into the welding machine.

The welding process in MIG welder involves much more than just pushing a button. You need to make sure to keep track of where you are moving your wire while welding. You should also keep your control panel within reach so that you can adjust it while the wire is already feeding into the machine from the automatic feed system. If you need to replace a wire, make sure that you do it before starting any other work on that particular piece of metal because if you need to stop working on something else and move or replace a wire, you could cause the current to be interrupted.

The MIG welder can be used for various types of welding processes such as tack welding, tacking, fillet welds, bead welds, and horizontal bead welds. The MIG welder is usually used on the bigger pieces of metal that need more pressure and heat than other welding techniques. It is also used in large scale production where there are a lot of different pieces to be welded together and it is hard to control the process by hand.

What are some terminologies of MIG Welding?

Here are some of the important terminologies involved in MIG Welding:


The gas that is used for welding is called argon. Argon has been used for several years and it is known to be a clean gas that does not affect the environment. It is also very cheap and readily available because it is a byproduct in the production of liquid oxygen.

Gas Outlet

The gas outlet is the part of the MIG welder where you will connect your supply hose and fill up your welding machine with inert gas. This part of your MIG welder can be adjusted to different levels depending on your needs.

Gas Pressure

The gas pressure of the MIG welder will tell you how much inert gas is being used at a given time. This pressure will also tell you how much of the inert gas will be used up during the entire welding process.


The trigger is what will start the MIG welder and also control it. The trigger has a mechanical trigger switch with a handle attached to it so that you can keep your hands away from the welding machine while working on the project. There are several types of triggers, but most have the same basic structure or design. In order for you to start welding, you must press down or pull down on the trigger in order to get it started. You will need to release it in order to actually start welding.

Wire Feeder

The wire feeder is one of the most important parts of your MIG welder because it will automatically feed the wire into your machine while welding. The wire feeder is usually powered by an electric motor that will rotate around at a high speed.

Wire Clamp

The wire clamp is another component that makes up your MIG welder. The clamp is used to cut the wire and then feed it into the welding machine. It is attached to the power cable of your MIG welder so that it will be able to feed the wire into your machine. This part of your MIG welder can be adjusted depending on your needs and work area.


MIG welding is a popular welding process used by various industries and craftsmen. It is a very effective way to weld metallic material, including steel. The MIG welder is designed with several different components that make it easy to use and maintain. In addition to the necessary components, you will also need to have the proper knowledge of MIG welding terminologies in order to get the job done properly.

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