WELDPRO MIG155GD, Руководство оператора, Страница: 21 / 36

GENERAL WELDING FACTS
Unlike soldering or brazing, welding is the process of fusing two pieces of metal together to create a permanent union. In order
to do so, there are many different types of welding. Most all the popular methods of welding require the weld area to be
protected in one way or another from the atmosphere around the weld while the weld is being performed. This is done by
various means in order to prevent contamination of the weld, which would result in a very poor quality product that lacked not
only appearance, but fusion. The weld would be full of porosity, and would be too weak to be effective in joining the work
metals. Shielding the weld area during welding is very important to a good weld.
Three of the most popular types of welding are offered with the MIG155GD. They will be briefly described here.
The MIG155GD is capable of performing MIG welding, Flux Core welding, and MMA welding.
MIG welding refers to “Metal Inert Gas” welding, a process where solid metal wire is continuously fed through a torch cable
while being shielded from the contamination of the atmosphere around the weld by a special shielding gas. Typically for MIG
welding that shielding gas is a mix of Carbon Dioxide (CO2) and Argon gas, usually in the percentage of 25% CO2 and 75%
Argon. It is the cleanest, smoke free of the three weld types.
Flux Core welding, while very similar to MIG welding does not require any shielding gas to be added to the process. This is
because Flux Core welding by definition uses a hollow wire, like a miniature straw and inside the wire, in its core, is a flux
which creates it’s own gas that provides the shielding as it is heated in the weld. The heat of the welding process turns the flux
into a gas that envelops the weld area, shielding it from the atmosphere.
MMA welding, (the third type) refers to Manual Metal Arc welding. This process is known by many other slang names such as
“stick welding” or “arc welding”. This type welding is performed by placing a welding rod, or stick. into its holder and
scratching its end to the metal to be welded which starts the electric arc. This type welding is also shielded from the
atmosphere with a flux that is heated into a gas that surrounds the area being welded. This time however, the flux is coated on
the outside of the consumable welding rod and no shielding gas tank is needed.
You can learn much more about each type welding as well as many others by simply searching the Internet.
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GENERAL WELDING F
ACTS