Types of Welding Machines
One of the most popular welders is an MIG welder. The Mig Welder uses Gas Metal Arc Welding which works by a wire which is fed through a welding gun. The wire is the electrode. At this instant, shielding gas flows through which protects the weld while it is setting and cooling down.
For this type of welding, carbon dioxide is most commonly used, one because it is the cheapest and two because it makes the great weld. Argon is also used because it makes a great mixture of carbon dioxide. This creates less “spatter” which in turn makes the weld cleaner. Using argon has alone will create the best weld with aluminum.
Over other processes of welding, the GMAW method has many advantages such as the welding gun itself which has a control on the trigger which will position the electrode without accidentally hitting one of the arcs. Once you have positioned the gun in the right place, all that left to do is put your helmet on and pull the trigger.
To make the welds smooth and clean use the inert shielding gasses, and there is normally no slag to chip off. Thinner metals and weld sheet metal suit best mig welder, because they can be welded at a much lower amp than other welders. MIG welders strike the welding arc using DC. Alternating current usually doesn’t give you a steady arc when welding.
The tensioner on the wire is variable, and you can also control the flow of the gas with a valve. Also adjusting the voltage of the MIG welder as well as the power as the wire feeds through is very useful for creating clean welds.
You can use a MIG welder without shielding gas, and this is called flux cored arc welding, FCAW. There is an option of switching the polarity of the arc for the flux cored wire. The process requires that the wire has a hollow core filled with flux for better effectiveness.
How To Use A Mig Welder
The first thing you need to do is purchase an MIG welder and the proper gear. Mig welding is probably one of the easiest types of welding to learn, but you should practice on scrap metal before working on your favorite project.
Always purchase the proper safety gear. At the top of the list, should be a welding helmet. I would recommend an auto darkening welding helmet, which is battery operated. You also need to cover your whole body with proper clothing and gloves because the welder will give off sparks that can burn your skin.
Next, pick a suitable location to start welding. A large concrete work floor, such as your driveway, is always a good place. Remember that using a welder always has a fire hazard because the sparks it gives off generate heat, so keep a bucket of water or a fire extinguisher nearby at all times.
Now you are ready to start operating the MIG welder. There are three main things you need to consider. These are the tip voltage, feed rate and how fast you move the tip. How you adjust these three factors will determine how good the weld is.
The voltage controls the penetration, while the feed rate of the wire will adjust the arc length and the speed at which you move the tip controls the transfer of metal to your work area. If the voltage is lowered, the weld will sit on top and too high will result in just creating a hole. This is why you need to practice, to get a good feel for it.
Now you need to find a good speed to move the tip. If the tip moves too fast, you will hear loud popping noises and lose the arc. If you move it too slow, the tip might melt and fuse to your work, which is a real hassle. Again, practice is critical, and it is not that hard after a few tries.
Now that you have experimented and found the correct voltage and feed rate and you feel comfortable using the MIG welder, it is time to start on the real thing. Remember that the key is to keep the tip moving consistently. You can view more on different sites. At first, it will seem a bit tricky, but after a while, you will be welding all kinds of things.