Blow hole and pin hole porosity, Other Engineering

Assignment Help:

Difference between Blow hole and pin hole porosity

         Blow hole : They appear as cavities in a casting. When they are visible on the upper surface of the castings, they are cooled open blows. These blows are normally rounded and have smooth walls.

         Pin hole porosity : This defect occurs in the castings in the form of pin hole porosity or gas porosity. These porosities are caused by the gases absorbed by the molten metal. The gases commonly absorbed and hydrogen, oxygen and nitrogen, the later two forming oxides and nitrides respectively. It is mainly hydrogen which is responsible for the pin hole porosity.


Related Discussions:- Blow hole and pin hole porosity

Levelling Theory and Computation, Two readings i.e., 1.64m, and 0.73m, were...

Two readings i.e., 1.64m, and 0.73m, were taken during leveling procedure to define the slope of centerline of a bridge at points A, and B. If distance AB = 50m, find the slope of

What is accounting management?, What is accounting management? Managemen...

What is accounting management? Management accounting is worried with offering details to supervisors - that is, individuals within a company who immediate and control its functi

Aerospace computational techniques, Bearing stresses are very common in aer...

Bearing stresses are very common in aerospace engineering.  It occurs on the surface of contact between any two structural members.  Bolts, pins, and rivets are classic examples of

Comparator, Comparator A comparator is a device, which compares two inp...

Comparator A comparator is a device, which compares two input voltages and indicates at the output, which of the two is the larger.  Basically, the circuits use a differential

Logic gate-nor gate, NOR Gate: Figure shows a further example of a 2 in...

NOR Gate: Figure shows a further example of a 2 input digital gate, again consisting of two NPN transistors, TR1 and TR2, in a different configuration. When input A and input

Fire fighting operations - high rise buildings, Fire fighting operations - ...

Fire fighting operations - high rise buildings: Inlets that allow the fire service to supplement to water to the sprinklers and to the fire mains are useful additions to the m

Software design principles, explain the design should be traceable to the a...

explain the design should be traceable to the analysis model

Solve problems using dc electrical principles, Electronics Engineering Assi...

Electronics Engineering Assignment# Solve problems using DC electrical principles 1.3 A 220 F capacitor is required to store 11mJ of energy. What voltage needs to appear

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd