By P.W. Muncaster, P. W. Muncaster
Entire recommendation on purposes, thoughts and the simplest on hand gear is given in transparent, hassle-free language
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Extra info for A Practical Guide to TIG (GTA) Welding
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.
Coating processes are mostly carried out by hand but much development is taking place in mechanical and automatic methods, Fig. 8. Four types of internal cladding that can be carried out by programmed TIG are shown in Fig. 9 and turnkey equipment can be purchased for this purpose. 9 Various types of internally clad surfaces. g. pressure vessel nozzles, control valve bores, seal faces and ball valves; Well head bonnets, gate valves; Components with pockets or blind bores; Valve ring grooves; Flat plates (gates) with/without intersecting holes.
The size of bores that can be clad varies from 25 mm upwards in diameter and up to 2000 mm length. The size and geometry of the bore dictate the welding process used. For plain, parallel bores up to 80 mm diameter the cold wire TIC process is used to weld the first pass, with hot wire TIC for subsequent passes. This combination provides good fusion/dilution properties and high deposition rates. Larger diameters are welded using hot wire TIC (or synergic MIG). The ultimate choice of process is based on economics and the weld properties required.