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How To TIG Weld

MIG
(Metal Inert Gas) and TIG welding are kinds of gas metal arc welding. During
MIG and TIG welding, continuous and consumable wire electrodes and a shielding
gas are fed through a welding gun. Constant voltage, direct current power
source are usually used with MIG and TIG welding, but alternating current
sources can also be used. Originally used for welding aluminiums, gas metal arc
welding was also soon applied to steels because it allowed to reduce welding
time substantially. Some advantages of MIG welding are that it is easier to
learn, longer welds can be made without the need to stop and restart, and
little post weld cleaning is necessary. The downsides are an oxidized weld
deposit, unstable arc, and weld porosity. Advantages of TIG welding are that it
allows welds of higher quality, with or without filling metal, good control of
heat, and low distortion. Some of the issues with TIG welding are a somewhat
erratic (wandering) arc, a high electrode consumption, and a certain porosity
of the weld.