By P.W. Muncaster, P. W. Muncaster
Accomplished suggestion on purposes, ideas and the simplest on hand apparatus is given in transparent, undemanding language
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Additional info for A Practical Guide to TIG (GTA) Welding
CATEGORY 0 TYPES 1 , 3 AND 4 High quality units mainly used for manual AC/DC welding. Also suitable for building in to mechanised, robotic and semi-automatic welding stations for welds of moderately high quality. Range up to a maximum of around 450 A, stable down to 8- 10 A. Particularly suitable for welding aluminium and its alloys. Features Current level meters and controls; Upslope and downslope time controls; Gas flow controls; Changeover switching, TIC to MIC/MAG; Arc strike by HF or similar; In-built or scope for add-on units such as pulse control, etc; h e - and post-purge gas weld timer, etc; Remote arc switching.
Average heat input to an unpulsed weld is the product of the power source dial current setting X voltage X time. To find this value for pulsed welding proceed as follows referring to Fig. 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.
The star rating indicates the merits and wearing properties of various materials for cable coverings, the more stars the better. 6 gives brief descriptions of type and use. Most countries’ standards associations have recommendations both for cables and connectors but considerable confusion still exists as to the production of a world standard for such items. The associations meet regularly to try and resolve the matter (particularly European and American) but at the time of writing no firm agreement has been reached.
A Practical Guide to TIG (GTA) Welding by P.W. Muncaster, P. W. Muncaster