Learn,about,MIG,Welding,and,Ba technology Learn about MIG Welding and MIG Welding Basic Information


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This process is called by many names and it basically is awelding process that uses an arc to heat metal that needs to be joined. Thewelder uses a continuous feed filler metal (a consumable) electrode and this isused on the work-piece. This type of welding also must use a shielding that isprovided by a gas or a mixture of gasses. This type of welding is also called short circuit transfer.In the MIG process, when the wire actually touches the metal to be connected,it lets go of the metal that does the welding. This makes sure that metaldoesn't transfer across an arc so there is no puddling.  Also known as gas metal arc welding, the MIG(GMAW) processuses a metal gun to provide this service instead of a torch so that you get adirect current going to the metal. You can use both constant current andalternating current systems to also produce this method of welding.  GMAW uses four ways to transfer metal. These are: Globular -- thismethod is difficult and used the least because it has a tendency to spatterbecause the gun will move to a high heat without warning. This makes thewelding surface come out with flaws. This method uses carbon dioxide so the electrode tends to produce a ballof melted metal that cases irregular shapes that are bigger than the electrode.They then drop and falls onto the piece you are working on which causes aspatter. This is difficult to control as you would imagine. Short circuiting-- this uses a smaller current than the globular method but it still usescarbon dioxide. Because of the lower current you can actually weld thinnermetals together with this method. This method is similar to the globular methodbecause drops of melted metal from the electrode still forms, but it causes theelectrode to short circuit instead of the drops falling on the work. Thiscloses off the arc but comes back again because the surface tension pulls themetal goblet from the tip.  Spray -- this wasthe first method for transfer used with GMAW and used to weld aluminium andstainless steel. The difference with this process is that the electrode metalpasses through an electric arc that is stable and goes all the way to theworkplace. This stops spattering and you get a weld finish that is higherquality than in other methods. You also will watch as the current and voltageincreases so you get small, vaporized steam droplets instead of large globules. Pulse spray --this last one is a newer way of doing this type of welding that uses a continuouscurrent that pulses and melts the filler wire. In each pulse a small droplet ofmetal will fall.  This also allows the welder to use a lowercurrent. The welder gets a more stable arc and this stops spatter and the shortcircuiting process. Because this process is slower, argon gas is used insteadof carbon dioxide as the shielding gas.

Learn,about,MIG,Welding,and,Ba

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