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.
Q. Corrosion resistance of tantalum? Tantalum is readily attacked by strong alkalis, even at room temperature, and therefore, is not suitable for use in processes where the pH
Question: The disk 3 shown in the figure rotates at a constant angular velocity ω 3 = 2.0 rad/s. A slider in a slot in the disk causes rod 2 to rotate. When the slider is
Product life-cycle management: There have also been changes in the use of some pre-existing data formats. Open associations have been formed to encourage some formats to becom
A copper bar 80 mm by 60 mm in cross-section (k = 370 W/m ºC) is lying in a insulated trough so that the heat transfer from one face both the edges is negligible. It is seen that w
what is law of chemical combinations?
Show that the force exerted by jet of water on a fixed semi-circular plate in the direction of jet when the jet strikes at the centre of the semi-circular plate is two times the fo
explain investment casting with neat sketch
Pyrolysis Pyrolysis is the procedure of depositing a ceramic on a heated substrate. The process is used to deposit coating or generate thin walled components of graphite or si
AUTOCAD HELP MENU In this section it will show the Drawing objects its will have some predifined oblects that will help , with some Lectures notes .It also having options as s
we can use in proove of energy is a propertyof system we can use (E) instead of (dQ-dW)
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd