Pulsed dc welding, Mechanical Engineering

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. 

Posted Date: 9/14/2012 8:34:31 AM | Location : United States







Related Discussions:- Pulsed dc welding, Assignment Help, Ask Question on Pulsed dc welding, Get Answer, Expert's Help, Pulsed dc welding Discussions

Write discussion on Pulsed dc welding
Your posts are moderated
Related Questions
Force - Mechanics: Sometime we push the wall, then there are no changes in position of wall, but no doubt we apply a force, as the applied force is not sufficient to move the

Illustrate the specification of PDDI (i)  The 3-D geometry of the product which is defined by a set of curves, surfaces and volumes. (ii) The topology which describes the se

Evaluate the speed of train: A train of mass 200KN has frictional resistance of 5N per KN. Speed of train, at the top of an inclined of 1 in 80 is 45 Km/hr. Find speed of tra

The layout of a transmission shaft carrying two pulley C and B and supported on bearings A and D is shown in figure. Power is supplied to the shaft by means of vertical belt on pul

What'' is balancing and vibration in machines Need of balancing? Causes of vibration and their harmful effects and remedies?

An electric heating element is rated at 4.0kW when connected to a single phase 240Vrms, 50 Hz AC supply, and is known to have a power factor of 0.833 lagging. 1. Calculate the c

Q. Handling tools and equipment for skid? Lifting or pulling and provisions for transportation of skid shall be in accordance with GS-904-0103, other relevant parts of contract

Short answer Type. a) Write the difference Between Dry clutch and Wet ? b) What is difference Between Chasis and Frame? c) Illustrate the Future trends in Automobile

GENERAL FACTORS BEHIND ACCIDENT:  Following are the factors, which may cause accidents in workshop, so we should take care of these factors: Insufficient light and ventilati

The specifications for use on a project will be as defined in the Project Execution plan. The Specification requirements will be clarified in the Engineering Estimate or at the Pr