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This focus book is intended to introduce the Flux Bounded Tungsten Inert Gas Welding (FBTIG) process, which is a variant of Activated Tungsten inert gas welding process. The benefits of activating flux in the weld pool in enhancing the depth of penetration and underlying mechanisms for the same is explained in detail. The benefits of FBTIG process over other fusion welding process are highlighted. The scope for the FBTIG process to be adapted at the industrial level and the advancements in this field is detailed that enables the practicing engineers to exploit the same. Covers activated TIG process, role of activating fluxes in enhancing the depth of penetration Illustrates mechanisms associated with FBTIG process including arc constriction effect, insulation effect and reverse marangoni flow Discusses scope of FBTIG process for commercialization at the industry level Gives general overview of chronological advancements in the field of welding This book is aimed at graduate students, researchers and professionals in welding, manufacturing and engineering.

TIG

British Columbia Vocational School. Welding Department

Published: 1973*

Total Pages:


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The fatigue performance of steel weldments can be improved significantly by remelting the toe region using standard tungsten inert gas (TIG) equipment. While the cost of TIG dressing is much lower than for comparable methods, the TIG process causes an increase in maximum hardness in the base metal adjacent to the remelted material. This may preclude the use of the TIG method for some applications. The hardness distribution in TIG dressed T- joints of St 52.3N and NVE 36 steel plates with thickness ranging from 20 to 38 mm was studied. A modified TIG dressing technique involving a second (tempering) run was developed, and a substantial reduction in maximum hardness as compared with conventional TIG dressing was obtained. Fatigue tests were performed on specimens with load carrying fillet welds in the as-welded and TIG-dressed conditions. The material was a quenched and tempered steel with a yield strength of 880 MN/mm2 (128 ksi). The increase in fatigue strength at the endurance limit due to TIG dressing amounted to approximately 65 percent.