By P.W. Muncaster, P. W. Muncaster
Accomplished recommendation on purposes, concepts and the simplest to be had apparatus is given in transparent, straight forward language
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Additional info for A Practical Guide to TIG (GTA) Welding
This is the voltage necessary to remove an electron from a stable atom and convert it into a charged atom or positive ion, making the gas in the area of the arc into a plasma. The remainder of the shielding gas around the arc excludes the active components of the surrounding air and prevents, or at least minimises, metal oxidation. c. a high concentration of energy within the arc area, Fig. 8. 90%,which is essential for welding. It can be used for a great variety of metals and is particularly good for mild and stainless steels, but equally useful for aluminium and magnesium alloys.
Multiply background current by (3)%= background current proportion. Add (4) to (5)= average weld current in amps. Then result (6) X arc voltage X complete weld time (sec) = heat input in joules. EXAMPLE: C D A B Primary current = 16 A Background current = 8 A High pulse time = 50 millisec. Low pulse time = 150 millisec. Total time taken for complete weld sequence taken as, say, 20 seconds arc time. e. 5 Hz. 0 A average current Then 10 A X 1 1 V X 20 secs = 2200 J. + VlABlLlN Pulsed TIC welding has a drawback in that it is slower than using unpulsed current but its great advantage is that heat build-up in the component is much reduced.
5. Since the edge becomes molten before the flat surface, torch angle is important. The edge will also tend to burn back or undercut. This can be controlled by dipping the filler rod next to the edge as it melts away. Enough filler metal must be added to fill the joint. Finish the end of the weld the same as before. Fill the crater. T JOINT A similar situation exists with the T joint, Fig. 6, as with the lap joint. An edge and a flat surface are to be joined together. The edge again will heat up and melt sooner.