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Welding: From Wikipedia, The Free Encyclopedia

Welding is a fabrication process that joins materials like metals by melting them together with heat and sometimes pressure. Some common welding methods include shielded metal arc welding which uses an electrode with flux around it, gas tungsten arc welding which uses an inert gas to shield the weld from contamination, and gas metal arc welding or MIG welding which uses a wire and inert gas shielding to protect the weld pool as the wire is fed into the weld. Other welding methods include flux-cored arc welding, submerged arc welding, and electroslag welding which are used for thicker materials.

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51 views2 pages

Welding: From Wikipedia, The Free Encyclopedia

Welding is a fabrication process that joins materials like metals by melting them together with heat and sometimes pressure. Some common welding methods include shielded metal arc welding which uses an electrode with flux around it, gas tungsten arc welding which uses an inert gas to shield the weld from contamination, and gas metal arc welding or MIG welding which uses a wire and inert gas shielding to protect the weld pool as the wire is fed into the weld. Other welding methods include flux-cored arc welding, submerged arc welding, and electroslag welding which are used for thicker materials.

Uploaded by

Ngro Quinapaxi Gonzalez
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Welding

From Wikipedia, the free encyclopedia

Gas metal arc welding (MIG welding)

Welding is a fabrication or sculptural process that joins materials,


usually metals or thermoplastics, by causing fusion, which is distinct from lower temperature
metal-joining techniques such as brazing and soldering, which do not melt the base metal. In
addition to melting the base metal, a filler material is often added to the joint to form a pool of
molten material (the weld pool) that cools to form a joint that can be as strong as the base
material. Pressure may also be used in conjunction with heat, or by itself, to produce a weld.
Some of the best known welding methods include:

Shielded metal arc welding (SMAW) - also known as "stick welding", uses
an electrode that has flux, the protectant for the puddle, around it. The electrode holder
holds the electrode as it slowly melts away. Slag protects the weld puddle from
atmospheric contamination.

Gas tungsten arc welding (GTAW) - also known as TIG (tungsten, inert gas), uses a
non-consumable tungsten electrode to produce the weld. The weld area is protected from
atmospheric contamination by an inert shielding gas such as Argon or Helium.

Gas metal arc welding (GMAW) - commonly termed MIG (metal, inert gas), uses a wire
feeding gun that feeds wire at an adjustable speed and flows an argon-based shielding gas
or a mix of argon and carbon dioxide (CO2) over the weld puddle to protect it from
atmospheric contamination.

Flux-cored arc welding (FCAW) - almost identical to MIG welding except it uses a
special tubular wire filled with flux; it can be used with or without shielding gas, depending
on the filler.

Submerged arc welding (SAW) - uses an automatically fed consumable electrode and
a blanket of granular fusible flux. The molten weld and the arc zone are protected from
atmospheric contamination by being "submerged" under the flux blanket.

Electroslag welding (ESW) - a highly productive, single pass welding process for
thicker materials between 1 inch (25 mm) and 12 inches (300 mm) in a vertical or close to
vertical position.

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