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!
INVERTER TYPE POWER SOURCESFor site welding and repair applications, a need was felt for long time to have light weight arc welding power source. Even though, a petrol driven rotary converter is portable, the weight is considerable and it produces lot of noise and smoke. Where power connection is available a simple rectifier type may do the job but not always. For example, for remote and elevated level welding, it is highly inconvenient to drag heavy welding cables and the cost of long welding cables is also high. Therefore to avoid these problems a new type of power source has been developed. This is called inverter type. A schematic is shown in Fig. The weight and size reduction is achieved by using a HF step down transformer, to produce necessary arc voltage. Transformer size and weight are inversely related to the frequency of operation. A Normal 50 Hz step down welding transformer is bulky and heavy because the frequency is low. If the frequency is increased to say 5 to 10 kHZ, then the transformer (made of ferrite cores) size and weight are drastically reduced. This is the principle behind inverter type power sources. Input voltage is directly rectified and is fed to a inverter circuit. The inverter circuit may be made of either thyristors or transistors. The inverter circuit generates HF AC (5 to 10 kHz) and the voltage is step down by a HF transformer. The transformer output is rect ified to give DC output . The inverter circuit can be easily controlled in a closed loop manner to give the desired output characteristics.
Bench Vices: Bench vice is used to hold a job on a bench. It consists of a movable jaw, a fixed jaw, spindle and a lever. Figure shows a bench vice. The movable jaw is in the fron
Figure presents a gearbox that you are going to design. The input shaft rotates at n1= 1500 rpm in a counterclockwise direction. The gearbox is needed to be designed sothat the out
Laws of motion
Instantaneous stress and elongation: What shall be the instantaneous stress & elongation of a 25 mm diameter bar, 2.6 m long, suspended vertically, if any mass of 10 kg falls
PLASMA WELDING This is an extension of TIG welding. In plasma welding torch, plasma energy is constricated and ensures its most efficient utilisation for welding cutting and s
describe the following characteristics sensitivity stability isochronous
what are the tests to carried out after mockup preparation
Pultrusion Structure sections of long length are generated by putting the fibres via resin bath and heated dies of exact shapes. Unidirectional fibres along with high volume f
WHO IS HOME MINISTER OF INDIA OF 2014?
Concept of plane stress: Define the concept of plane stress. Sol.: In cubical element of strained material is acted on by stresses acting on only 2 pairs of parallel plane
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