Dave has placed pieces of insulation on top of the crucible and is pumping nitrogen gas into the bottom of the crucible. The nitrogen gas, as it passes through the molten aluminum, helps to remove hydrogen from the melt and eliminates or reduces porosity in the castings.
Previous Picture
39
of 52 
Next Picture
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 26A 26B
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
42 43 44 45 46 47 48 49 50 51 52
Return to First Page of This Set