Power Sources
A TIG power source should have a constant current characteristic but may be either AC or DC output. AC power sources may have conventional sine wave or square wave output, and may have pulse or variable-frequency balance capabilities.
For site work, ancillary equipment can be linked to a petrol or diesel engine-driven generator to act as a power source. The choice of power source depends on the material to be welded and, possibly, the location where welding will be carried out.
More sophisticated power sources allow the welding current to start at a low level and build up and also allow the current to decay slowly when welding ceases. This ‘slope-up’ and ‘slope-down’ facility prevents burn-through on thin material and allows crater-filling to take place.
The power source may also allow the gas flow to be started before the arc is struck and after the arc has been extinguished and welding has finished. This pre-post-flow technique is very useful in reducing contamination of the weld from the atmosphere by ensuring adequate gas cover is available when the arc is struck and by maintaining the gas shield until the final molten weld pool has cooled sufficiently.
Lincoln Invertec V160T | Lincoln Invertec V160T Dual-voltage | Lincoln Invertec V205T AC/DC |
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