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

Math algebra calcilus, I am having difficulty with algebra pertaining toeng...

I am having difficulty with algebra pertaining toengineering

Signal and system, if the response of a signal is h(t) then the cascading o...

if the response of a signal is h(t) then the cascading of two responses h1(t) and h2(t) is given by

Calculate the relative load of mobile broadband subscribers, Question: ...

Question: (a) A mobile operator wants to weigh and allocate cost towards mobile broadband subscribers with mobile broadband at 80% of the traffic and 15% of the subscribers. H

Computational aerodynamics-module style, The module content and teaching st...

The module content and teaching style has undergone revision since 2006-07. There are two reasons for this. First, this was the first year that Prof Badcock was responsible for the

Thrust indication - aircraft engine, Thrust indication: Although rpm ga...

Thrust indication: Although rpm gauges give an indication of the rotational speed of the compressor, they do have one drawback. They do not normally indicate the thrust output

Communication, Can u provide some information about simple wireless transmi...

Can u provide some information about simple wireless transmitter and receiver.

Grain boundary, Q.  Describe the structure of grain boundary. Ans. O...

Q.  Describe the structure of grain boundary. Ans. One phase of metal contains many grains of various orientation, the individual crystals are called grains. Thus a grain is

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