T6-6061 Aluminum Mockup of overlap joint. Short piece (< 0.5m) resting on foam insulation

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