Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 9, Issue 4, Pages 337-344Publisher
MANEY PUBLISHING
DOI: 10.1179/136217104225021571
Keywords
Ti alloy; TIG welding; activating flux; weld penetration; process monitoring
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In the present paper, the effects of an activating flux on Ti-6Al-4V alloy welding were investigated. Tungsten inert gas welding was used to welt 8.0 mm thickness Ti-6Al-4V alloy plates. Results show that applying the activating flux on the Ti-6Al-4V alloy surface leads to an increase in weld penetration depth, whereas the corresponding weld bead width is reduced. It was also found that various welding conditions, particularly flux thickness, influence the effectiveness of the activating flux. Furthermore, a data acquisition system it,as used to monitor the current and voltage signals during welding. Results from monitoring of the welding current and voltage signals reveal that there is a clear correlation between the signals and the weld penetration when the welding arc is steady. Analysis of the acquired signals can be used to identify inconsistencies in weld penetration. In summary, to take advantage of the use of activating flux in Ti alloy welding, it is important that a uniform flux layer is present at the alloy plate surface and suitable welding parameters are selected.
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