Blow hole and pin hole porosity, Other Engineering

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.

Posted Date: 8/3/2012 2:35:13 AM | Location : United States







Related Discussions:- Blow hole and pin hole porosity, Assignment Help, Ask Question on Blow hole and pin hole porosity, Get Answer, Expert's Help, Blow hole and pin hole porosity Discussions

Write discussion on Blow hole and pin hole porosity
Your posts are moderated
Related Questions
what are wavefronts and how are they useful in the field of optics and medicine?

Capital Budgeting Decisions The most important function of a finance manager is the efficient allocation of its capital. The investment decision of a firm is termed as capital budg

how to do a cash management project report ,including problems?example?


Since the introduction of mobile phones and other smart devices, concerns (both scientific and public) have been raised about the potential health impacts from regular use. Numerou


Measurements of Economic Worth There are several methods of economic worth used to compare alternatives. If you decide to use present worth analysis, then you have indicate a

OUTPUT CHARACTERISTICS: Figure shows a "Common Emitter" amplifier stage. Common Emitter Amplifier Stage With no base/emitter bias applied, there will be no collector

Q.6 Define powder-metallurgy. What are various important techniques for compacting of metal powders ? Ans. Powder metallurgy is a technique of producing metal powders and mak

What Is EBIDTA?  EBITDA appears for income before attention, taxation, devaluation, and amount. EBITDA came into large use among personal investment companies, seeking to determ