Establishing relationship between fusion zone hardness and grain size of gas tungsten constricted arc welded thin sheets of titanium alloy

摘要

Ti–6Al–4V alloys are perfectly suited for fan compressor blade material in advanced aero engine components due tooutstanding resistance to corrosion and specific strength was high in both room temperature and elevated temperature.For autogeneous welding of thin sheets of Ti–6Al–4V alloy, the gas tungsten constricted arc welding (GTCAW) wasestablished to be beneficial than the gas tungsten arc welding process. The performance of welded joints depends onthe fusion zone grain size (FZG) and fusion zone hardness (FZH), which need to be suitably optimized and controlled toattain advantageous mechanical characteristics of the joint. Hence, in this research study, efforts were taken to developempirical relationships for predicting the FZH and FZG incorporating very important GTCAW parameters. Parameteroptimization was performed using response surface methodology. Additionally, the influence of GTCAW parameters onFZG and FZH was analyzed. From the results, it is inferred that the inter-pulse frequency has better influence on FZG andFZH compared to other parameters.