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T6-6061 Aluminum Mockup of overlap joint. Short piece (< 0.5m) resting on foam insulation. Gentle grinding: Max Temp < 50 C Aggressing grinding: Max Temp < 90 C. ~1 mm thick emery grinding wheel. Work done by Bert Gonzales Temperature monitoring: Jorge Montes. Monitor 1. - PowerPoint PPT Presentation
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T6-6061 Aluminum Mockup of overlap joint.Short piece (< 0.5m) resting on foam insulation
Gentle grinding: Max Temp < 50 C
Aggressing grinding: Max Temp < 90 C
~1 mm thickemery grinding wheel
Work done by Bert GonzalesTemperature monitoring: Jorge Montes
Temperature (Celsius) versus time (arbitrary)Monitor 1
Monitor 2
Monitor 3
Aggressive grinding at time ~ 500
Gentle grinding at time ~ 80
Bert Gonzales reported that cutting throughthe weld was not any harder than cutting through T6-6061 Al
Dremel tool kit also has a fiber-glass reinforcedemery grinding wheel.
Bert says that this is harder to control. Ittends to jump a bit.
Emery wheel is recommended.
Type density Thermal Cond. Specific Heat
T6-6061 Al* 2.7g/cc 167 W/(m-C) 1.3e3 J/(kg-C)Pure Al* 2.7g/cc 220 W/(m-C) 896 J/(kg-C)AA 1100** 2.7g/cc 222 W/(m-C) 906 J/(kg-C)
*http://www.engineersedge.com/properties_of_metals.htm
** http://www.substech.com/dokuwiki/doku.php?id=wrought_aluminum_alloy_1100&DokuWiki=5fb40349ffd1dc8213525ba1dde42e6b
If aggressively grinding the weld:
Worse case temperature = (90 C – 24 C)*(1.3e3/900) + 24 C = 119 C
If gently grinding the weld:
Worse case temperature = (50 C – 24 C)*(1.3e3/900) + 24 C = 62 C