I am comparing heat input during FSW and TIG welding of Al alloy. Welding speed was 41 mm/min in case of FSW and 150 mm/min in TIG. Heat input in J/s (watt) is more in case of TIG as compared to FSW. But trend of heat input is reversed if we divide the heat input (J/s) by welding speed (mm/s) to get the result in kJ/mm. The difference between welding speeds of both processes is large that resulting in to the more heat input (kJ/mm) in case of FSW as compared to the TIG. I want to find the heat input in kJ/mm without reversing the trend.
How these heat inputs can be correlated to the cooling rate?
One question on this, When you take Power in kJ/mm I think it is along the direction of welding maintaining constant width and penetration. Is it or any other?
But basically, we should take common datum in comparing..
If you desire to compare the effect of heat input on microstructure of these two processes, it may be misleading. Because, FSW has an additional component of severe plastic deformation due to the intense stirring action of the tool that will play a major role in defining the weld zone microstructure.
thank you dear Weerasekaralage, Dinaharan and Bárta for your valuable suggestions.
Dear Jozef Bárta, cooling rate may be helpful to solve heat related issue. Thank you again.
Just to add some additional info on FSW process. As you may know, the heat comes from two main sources: Friction between the tool and material and plastic dissipation during deformation of material as stated by Isaac. In addition, Chao et al. (2003) in his 'Heat transfer in friction stir welding - Experimental and numerical studies' found that approximately 5% of the heat is transferred back to the tool too.
Such considerations among others would make it rather difficult to compare its heat input with TIG where you have to consider other aspects unique to fusion welding. Measuring cooling rate/peak temperature as stated by Dr Jozef Barta might be the easier option.
Good luck!
Dear Sunil , In relating to cooling rate, You could use heat transfer through the structure in both case (Equations for conduction, convection and radiation.) I think you are going to investigate heat losses.. distortion, welding efficiency.. etc
But, It is helpful to answer, If you give little more details about your specific work related to FSW and TIG.
Regards
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