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C-50 (50% argon/50% CO 2) is used for short arc welding of pipes, C-40 (60% argon/40% CO 2) is used for some flux-cored arc welding cases. Better weld penetration than C-25. C-25 (75% argon/25% CO 2) is commonly used by hobbyists and in small-scale production. Limited to short circuit and globular transfer welding.
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.
Argon is preferred to less expensive nitrogen in cases where nitrogen may react with the reagents or apparatus. Argon may be used as the carrier gas in gas chromatography and in electrospray ionization mass spectrometry ; it is the gas of choice for the plasma used in ICP spectroscopy .
Most weld purging is carried out on joints made by the TIG or GTAW arc welding process. [6] When the laser welding process is chosen, joints or welds being made on reactive materials will need to be carried out and in the case of electron beam welding, this is carried out in a vacuum, in which case purging takes place by complete evacuation of all gas.
The most common purge gases commercially available in large quantities are nitrogen and carbon dioxide. Other inert gases, e.g. argon or helium may be used. Nitrogen and carbon dioxide are unsuitable purge gases in some applications, as these gases may undergo chemical reaction with fine dusts of certain light metals.
Frequently used in mixtures with e.g. nitrogen or air. Nitrogen: N 2: 1.15: 28: 1.251 – – not Often used at high pressure. Does not facilitate combustion. Can be used with 10–20% of SF 6 as a lower-cost alternative to SF 6. Can be used standalone or in combination with CO 2. Non-electron attaching, efficient in slowing electrons. Air: 29 ...
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