Abstract
This work presents a comparative study and industrial scale application of three Tungsten Inert Gas (TIG) welding modes of commercially pure titanium: pulsed welding in shorts interrupted intervals under the controlled technological welding conditions (mode 2), traditional TIG welding process (mode 3). As welding of commercially pure titanium needs special attention particularly to proper shielding, tools which ensure full protection were designed to shield initial weld pool, weld and nearby base metal from contamination. Consequently, welding in the fully covered Argon (Argon box) gas using designed Track and Back shielding tools (mode 1) was suggested for the industrial scale application, tested and discussed. The comparative study includes evaluation of process stability as well. Non-destructive and destructive tests were accomplished according to the standardized procedures to ascertain the influence of welding modes on the quality and performance characteristics of the welds. Results of the liquid penetrant test, visual inspection, and radiographic inspection showed that the welds obtained using designed Track and Back shielding tools have met all the acceptance criterions. Destructive tests’ results confirmed presumptions of importance to use appropriate shielding for pure titanium welding.
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