MIG is one of the easiest welding
processes to learn. However, there is more to MIG welding than running beads.
MIG or metal inert gas welding is one of the oldest techniques where a spool of
steel wire is fed through a liner and then out of a contact tip on the MIG gun
which is either heated or electrically charged when the trigger is pulled and
melts the wire for the weld puddle. This is accomplished through short circuit
welding. In this technique, droplets of molten wire which heats when short
circuited, flows to make a puddle as it touches the base metal.
Benefits of MIG welding
An inert gas like argon or helium
that flows from the gun keeps the weld puddle protected from the atmosphere.
Later on it was discovered that carbon dioxide also works well although it is
not an inert gas, which is why it is also known as GMAW or gas metal arc
welding. For the most part, MIG welding is an indoor process and is used in
shops and factories. One of the major benefits of MIG is the potential for high
productivity since there is no need to change rods or chip and brush welds
frequently. It is also easy to learn and can weld stainless steel, mild steel
and aluminum.
TIG welding
TIG or tungsten inert gas
welding is a process that uses a non-consumable tungsten electrode to deliver
current to the welding arc. The tungsten acts as a torch, generating heat,
which melts the metal. A filler metal is usually used. A shielding gas such as
argon protects the weld area from contamination. TIG welding is used to weld
thin section of stainless steel and non-ferrous metals like magnesium and
aluminum. TIG welding requires more skill and takes longer to master when
compared with MIG welding.
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