Pulsed dc welding, Mechanical Engineering

Assignment Help:

Pulsed DC Welding

Pulsed DC involves the repetitive variation in arc current from a background (low) value to a peak value. Adjustments of the pulse current time, background current time,peak current level & background current level can be made to provide a current output wave form suited to a fixed application. Generally, pulse frequencies are ranges  from 0.5 to 20 pulses per second. Pulsed DC is usually applied with the negative electrode (DCEN). In pulsed DC welding, the pulse current level is typically set at 2 to 10 times the background  level of current. This combines the driving, forceful arc characteristics of high current with the low heat input of low current. The pulse current achieves good fusion and penetration, while the background current maintains the arc and allows the weld area to cool.


There are several advantages of pulsed current. For a given average current level, greater penetration can be obtained than with steady current, which is useful on metals sensitive to heat input and minimises distortion. Very thin metals can be joined with pulsed DC. In addition, one set of welding variables can be used on a joint in every positions, like  circumferential weld In a horizontal pipe. Pulsed DC is also useful for bridging gaps in open root joints. 


Related Discussions:- Pulsed dc welding

What do you understand by straight line mechanism, What do you understand b...

What do you understand by straight line mechanism ? Describe with a neat sketch the working and construction of any three types of straight line mechanism. Derive a mathematical

Tom, velocity ratio is 3 .pinion has 40 teeth. what would be the gear no of...

velocity ratio is 3 .pinion has 40 teeth. what would be the gear no of teeth?

A flexible manufacturing cell architecture, A Flexible Manufacturing Cell A...

A Flexible Manufacturing Cell Architecture An illustration object-oriented control system for a flexible manufacturing cell is represented in this section. This contained vario

Statics, what are the common application of statics in industry

what are the common application of statics in industry

Applications of high temperature materials, Q. Applications of high tempera...

Q. Applications of high temperature materials? A brief description of materials of construction used for common high temperature components in furnaces, boilers, superheaters,

Structural notches-metallurgical defects, Structural notches In t he ca...

Structural notches In t he case of solid solution strengthened alloys and age hardenabled steel, the variation in heat i/o during welding may cause localized grain coarsening o

Resolve a force system in to single force, Resolve a force system in to sin...

Resolve a force system in to single force: Resolve a force system in to single force and a couple systems. Also explain the Equivalent force couple system. Or 'A

State Initial graphics exchange specifications, Initial Graphics Exchange S...

Initial Graphics Exchange Specifications (IGES) The basic concept of IGES is concerned with the exchange of product description data from one CAD system to another one. The CAD

Molding sand , which are the different types of molding sands?explain each

which are the different types of molding sands?explain each

Find out bulk modulus, Find out bulk modulus: A steel bar of 25 mm dia...

Find out bulk modulus: A steel bar of 25 mm diameter was tested on a gauge length of 250 cm in tension and in torsion. A tensile load of 50 kN generated an extension of 0.13 m

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd