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Autogenous welding is a form of welding in which the filler material is either supplied by melting the base material or is of identical composition. [1] The weld may be formed entirely by melting parts of the base metal, and no additional filler rod is used. There is some variation in the use of this term.
GTAW weld area. Manual gas tungsten arc welding is a relatively difficult welding method, due to the coordination required by the welder. Similar to torch welding, GTAW normally requires two hands, since most applications require that the welder manually feed a filler metal into the weld area with one hand while manipulating the welding torch in the other.
This is an autogenous process and normally does not use filler wire or powder. Medium plasma uses current between 10 and 100 amps and is used for higher-thickness plate welding with filler wire or autogenous up to 6 mm (0.24 in) plates and metal deposition (hardfacing) using specialised torches and powder feeders (PTA) using metal powders.
TAG welding was then the use of a tungsten tipped arc creating welding machine. The tip was centred in shroud that fed argon gas around tungsten tip to prevent the composition of the weld becoming oxidised and fragile. TAG welding used rods of a metal suitable for the material to be welded permanently together.
Lead burning is an autogenous welding process. Two sheets of lead are formed mechanically to lie close against each other. They are then heated with the torch flame and flow together. No filler rod is required, the sheets form their own filler (autogenous welding).
Not all welding processes require filler metal. Autogenous welding processes only require part of the existing base metal to be melted and this is sufficient, provided that the joint is already mechanically close-fitting before welding. Forge-or hammer welding uses hammering to close up the hot joint and also to locally increase its heat.
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