Tungsten inert gas welding equipment details Part 2
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This is the second part of Tungsten inert gas welding equipment by welder referer.If you want to read the first part just click the next link – TIG welding equipment
Before being used for TIG welding, electrodes must be sized and shaped.Some TIG welding jobs call for an electrode with a specific shape,which are used for critical welds.Using an inert gas shield instead of a slag to protect the weldpool, this technology is a highly attractive alternative to gas and manual metal arc welding and has played a major role in the acceptance of high quality welding in critical applications.
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Basic TIG equipment components include:
- tungsten electrode
- welding machine (constant current-CC, AC, DC+, DC- or AC/DC). There are advantages to getting a machine that is designed for TIG welding in order to stay balanced during the weld (see below for explanation). Regardless of type, a high frequency unit must be built in or attached.
- torch or electrode holder
- shielding gas supply (helium, argon or mixture): argon better for thinner metals due to lower heat requirement
- filler metal rod
- personal safety equipment
Most welding is done with DCSP or AC current. While the equipment is more expensive, there are many advantages to the TIG process. On important disadvantage is that GTAW is less economical than consumable electrode processes for sections thicker than 3/8 of an inch.
The basic features of the TIG equipment are shown in figure 10-33. The major components required for TIG welding are:
- the welding machine, or power source
- the welding electrode holder and the tungsten electrode
- the shielding gas supply and controls
- Several optional accessories are available, which include a foot rheostat to control the current while welding, water circulating systems to cool the electrode holders, and arc timers.
There are ac and dc power units with built-in high frequency generators designed specifically for TIG welding.These automatically control gas and water flow when welding begins and ends.If the electrode holder (torch) is water-cooled, a supply of cooling water is necessary.Electrode holders are made so that electrodes and gas nozzles can readily be changed.
Mechanized TIG equipment may include devices for checking and adjusting the welding torch level, equipment for work handling, provisions for initiating the arc and controlling gas and water flow, and filler metal feed mechanisms.