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!
Backup Purge
Backup purge gas can also be used to protect the under side of the weld and its adjacent base metal surfaces from oxidation on the time of welding . Uniformity of root bead contour, freedom from undercut and the desired amount of root bead reinforcement are more likely to be achieved when using gas backup under controlled conditions. In most materials, gas backup reduces root cracking and porosity in the weld.
Argon and helium are satisfactory for the backup purge when welding all materials. Nitrogen may be used satisfactorily for backup welds in austenitic stainless steel, copper and copper alloys. In the rule of thumb, a relatively inert atmosphere will beobtained by flushing with four times the volume to be purged. After purging is completed, the flow of backup gas during welding should be reduced until only a slight positive pressure exists in the purged area. After the root and first filler passes are done, the backup purge may be discontinued. When using argon & nitrogen, the backup gas should preferably enter the system at a low point, to displace the atmosphere upwards and be vented at points beyond the joint to be welded.
Figure shows an impression of one of many lifting arrangements produced and used at a steel fabrication workshop. It was manufactured to lift a maximum of 50 kg and due to a produc
computer aided design of piercing press tool
how should we consider positive or negative when summation of forces
Derivation of formula of thermal stress
Discuss relative demerits and merits of belt, rope and chain drive for transmission of power and find the condition for transmitting the maximum power in a flat belt drive.
Keywords related to railway line: Railway Station : A facility along a railway line where trains stop and passengers are serviced, and cargo is handled. Platform : A fa
define elastomer.explain in details?
Bhasker operates a retail shop and sells the high priced "Hot Food" thermoware. Each unit I priced at Rs.250. Experience has shown that the weekly demand schedule for items is as f
write a VB programme that compute the binary ordering algorithm for unlimited number of machines and parts
Reaction on the beam - mechanics: Determine algebraically the reaction on the beam loaded as shown in the figure given below. Neglect the thickness and mass of beam.
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