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!
SPOT WELDING
In this type of welding, after proper cleaning of the surfaces, the metals to be welded are kept one above the other and two copper electrodes are kept on both sides of the plates. The weld cycle consists of four periods.A) Squeeze Time: A pressure is applied to the electrodes and maintained for a particular interval before further operations start and this time is called squeeze time.B) Weld Time: This is the period during which the weld current is applied. The duration of application of current is always measured in terms of the number of cycles; each cycle corresponds to 20 ms. (1 / line frequency). The pressure is also maintained during this time.C) Hold Time: After the passage of current is cut off, the pressure has to be maintained for a brief interval of time so that the heated metal solidifies and forms a weld nugget. This period is called hold time. D) Off Time: This is the time for which we have to wait at the end of the spot welding before starting any other welding operation on the materials. Usually, resistance welding is carried out at line frequency (50 Hz) but for some applications high frequency (450 KHz) resistance welding is also employed.
Changes in Mechanical Properties along with Tempering: Tempering enhances the toughness and ductility of quenched steel though decreases hardness. Following figure demonstrate
what is internal combustion engine
fire box
Controls for resistance welding machines The main controls required for a resistance welding machine are: i. Initiation and termination of the current. ii. Controlling the mag
(a) Compare otto, Diesel and Dual combustion cycle on the basis of compression ratio, same compression ration and same Heat input and constant maximum pressure and heat supplied.
Conventional Priority Rules The standard solution for production scheduling (routing and sequencing) difficulties is the utilization of priority rules. A priority rule is an o
Q. Define Carbon steel? At ambient temperatures and under dry conditions, caustic is not particularly corrosive and can be handled in carbon steel. However, stress corrosion c
Find out angular displacement of a partical: The angular displacement of a rotating body starting from rest is defined by φ (t ) = 4 t 3 - 3 t 2 . Find out its angular di
Cellulosic Electrodes In the AWS E 6010 and E 6011 series of electrodes, the protective covering is composed of cellulose (C6H10O5) and silicate binders. The cellulose decomposes
why pre sintering needed in powder metallurgy
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