Material flow during FSW varies from one zone to another in the SZ depending on the FSW tool profile and significant heating caused by tool material interaction. Similarly, the distribution of precipitates in the SZ is not similar. The appearance of precipitates is found mostly different in the advancing side, retreating side, top middle zone and bottom of the SZ. Hence, is there any significant correlation between the nature of precipitation with material flow during friction stir welding of materials?
In FSW material flow is related to many parameters, like welding speed, tool rotation, plunge depth/axial force, pin and shoulder profile, material, size and properties of the sandwich material or fillers and tilt angle. So I think the material structure you gained is related to all the parameters. We can gain almost uniform structure by optimising the parameters.
Material flow accompanied by solid-state diffusion at comparatively higher temperatures does affect the nature of precipitation during FSW. Mathematical correlations can be developed based on specific series of aluminium alloys and in particular the effect of precipitates on mechanical properties.
I think that even the material you weld with plays an important role in defining the parameters of the welded part before and after welding.
Thanks for all of your kind reply. But, I am still looking forward to learn material flow impact on the precipitation, if any dependent relationship exists. Material flow depends on the heat generated during friction between tool and workpiece. Based on the standard tool geometry with metalic materials interface heat generation and its dissipation are different in various region (like, regions under tool shoulder, beneath of the tool pin, etc). Hence, material flow also varied in location to others. Upto this things are clear and understandable. But, the question in my mind start from here. If material flow differs one location to another with its type and velocity, will it affect on the precipitation behavioir of various locations in stir zone?
YES IT DOES.THERE IS SURELY RELATION THERE ARE STUDIES AVAILABLE HOW THE SPEED THE SHAPE OF THE TOOL AND MATERIAL CHARACTERISTICS ARE CHANGING .MY PAPER REVEALS THE WEAR IS DIFFERENT, THE MICRO STRUCTURE CHANGES, ALSO HOW THE CORROSION IS ALSO CHANGING.
Material flow does not have any role on the state of precipitates during welding of precipitation hardenable aluminum alloys (AA2XXX, AA6XXX and AA7XXX). More heat is generated on the advancing side than the retreating side during friction stir welding. This is the reason for variation in the state of precipitates across the stir zone from advancing side to retreating side.
Sure.
We published two papers on the Influence of flow rate on scale formation from flowing water in pipes and water distillation system in Tafila and from Disi to Amman in Jordan.
Please read them on my RG or send me an email to send you copies of.
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