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By P.W. Muncaster, P. W. Muncaster
Complete recommendation on functions, suggestions and the simplest to be had gear is given in transparent, user-friendly language
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Extra info for A Practical Guide to TIG (GTA) Welding
UNPULSED/PULSED TIG WELDING 41 even using a pedal, with maximum current required set on the control panel and the operator varying the heat input by slightly increasing or decreasing the arc gap, although this cannot be done over a wide current range. The writer recommends use of a pedal current control for all manual welding as this allows full range heat variation in addition to leaving both the operator’s hands free to work. Not all power sources have controls for varying the shielding gas pre- and post-purge times, the gas being on at all times which is wasteful, so always try to select a set which has these functions if possible.
These are not based on any standards either national or international but are merely given to list some of the minimum features a purchaser should expect from equipment from each of the categories in addition to the basic current controls and meters: TIG WELDING POWER SOURCES 35 CATEGORY A - TYPE 2 These are precision solid state, transistorised units and almost always for special and automatic use when extremely stable and consistent arcs are required. They are comprehensively specified and can be very expensive.
2. To calculate avcrage welding current in amps First add high pulse time to low pulse time, both in milliseconds. This is the total weld cycle time (100%). Divide the high pulse time by the weld cycle time which gives a high pulse figure as a decimal of 1 . Multiply result (1) by 100 = high pulse time percentage. Subtract result (2) from 100 = low pulse time percentage. Multiply primary current by (2)% = primary current proportion. Multiply background current by (3)%= background current proportion.
A Practical Guide to TIG (GTA) Welding by P.W. Muncaster, P. W. Muncaster