Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Gas Porosity
Porosity is the presence of gas pockets or voids caused by the entrapment of gas evolved during weld metal solidification. This Porosity is caused due to improper shielding, rust on the weld face, too much generation of gas in weld pool, fast cooling of slag, etc. Sometimes elongated tubular gas pockets are called worm holes. It is seen by testing that porosities reducing the cross sectional areas of the weld upto 5 % have no significant effect on the strength, ductility or toughness. But, when porosities are present near the surface, it could lead to failure on bend test. Porosity is considered to be the least dangerous defect but is often an indication of damp electrodes having been used.Pores in welds in mild steel are therefore normally regarded as harmless as regards the reliability of a welded joint provided that the weld is not working under corrosive conditions and when the thinner weld material at the pores can cause leaks after a short time.Porosity in weld in high tensile steels is a warning of hydrogen cracks in the weld metal and the heat affected zone. Pores are often linked together by a hydrogen crack.In static test, porosity will affect fillet welds much more adversely than butt welds. The different types of porosity are
Porosity is easily detected by radiography. Surface pores are usually detected by LPI.
Factor of Safety: Factor of safety is number used to determine working stress. It is fixed based on experimental works on material. It accounts all uncertainties like, mate
how to solve bending moment equation
Q. Safety and Loss Prevention? Are there special venting requirements for flammables and toxic materials? Air conditioning, heating and ventilation: • are non-sparking fa
Figure: Structure and Relationship among the Basic Holons of a Holonic Manufacturing System Staff Holon The function of staff holon is to support other holons along
basics of static balancing.
Switch Assembly: A switch assembly consists of four rails. The two outer rails are known as the stock rails. The two inner rails are called tongue rails. One stock rail and o
Fundamental geometric transformation: The fundamental geometric transformation is Rotation, Translations and Scaling. Other transformations involve reflection and shearing. Tr
Types of springs
derive an expression for the fundamental frequency of sound obtainable from a tube given diameter open at one end
What are the types of Boundary Layer and what do you understand by separation of Boundary layer. Can you Derive Hagen Poiseulle formula. Aslo illustrate Reynold's No.
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd