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When molten metal is poured to produce a casting, it must first flow into all of the regions of the mold cavity and then freeze into the new shape. The flow and freeze must occur in the proper sequence, if the metal starts to freeze before it has completely filled the mold the defect known as cold shuts is produced.
The ability of a metal to flow is known as fluidity and casting alloys are selected for their fluidity. The single greatest contributing factor in controlling fluidity is the pouring temperature. The higher the pouring temp. the greater the fluidity. Using to high a pouring temp. will cause chemical reactions between the metal and the mold, and the metal and its pouring atmosphere will be accelerated, causing large amounts of gas to be dissolved.
If the metal is to runny a defect known as penetration can result. This is caused by the metal flowing into the small voids between the particles that make up a sand mold. the surface of this casting would contain small particles of embedded sand, this defect is called penetration.
What else can I help you with?
Ethyne when reacts with aqueous KMnO4 in cold condition forms formic acid and in hot condition oxalic acid it should not be reversed?
oh shut up yu@@%$#^%%@
Hwhy do i get hot water but no water when turned to cold?
Odds are that the cold water lines to the faucet you are trying to use are shut off but the hot water lines coming from the water heater are not. That is why you have hot water but no cold water.
Why did newtons university shut down?
Newton's university shut down because of the plague.
Explain the importance of hydration and the factors that may affect hydration?
Hydration is incredibly important because the body is nearly 60% water. Without proper hydration, the muscles and organs will begin to shut down. One factor of hydration is not drinking enough water, another is sun exposure.
How can you burn yourself with salt?
Warm it up in the oven, then toss it in your eyes. keep your eyes shut! shut shut.
What is the difference between a Hot water shut off valve and cold water shut off valve?
the hot water valve shut off valve shuts off the hot water. The cold water valve shuts off the cold water. ;()
Why does car engine shut down when its cold?
Don't know how cold your cold is but, it could be water in the fuel system (ice).
Shut down condition coal fired boiler?
Cold
Where is Valve Shut Off on gas water heat?
On any water heater, the shut off is on the incoming cold pipe.
How can I shut off cold water in my condo?
Which water you talking about? Under the kitchen sink there should be a C/W shut off If your talking toilet there should be a shut off left hand side under the tank. Shower or bath tub possibly integral stops Main cold water shut off Normally by the house trap. Multi story building a cold water riser
How do you explain 'zip ya lip'?
"Zip ya lip" means shut your mouth.
How do you delete an account on bakugan dimensions?
I'd explain, but Dimensions was shut down permanently.
Is a sand dollar cold-blooded?
shut the f up
What does the idiom 'out in the cold' mean?
It means that you were "coldly" ignored or rebuffed, as though someone shut the door and left you outside in the cold weather.
If the hot water tank is not connected why is water coming out of all the faucets on the hot side?
There is a hot/cold cross connection at one or more of the faucets at you house. make sure all faucets are shut off both hot and cold. If it still occurs more than likely you have a Moen faucet somewhere (most likely).
What could explain the external form of fish?
it means that when you say that to a person your actually saying ''shut your mouth''
Main off and still have water flowing?
You will get some back pressure from the water heater. It will come out of either the hot or cold. Shut the tank off if there is a shut off there.
