Gmaw power source, Mechanical Engineering


A power source wit h a flat characteristics is almost universally used for GMAW process as it provides self adjustment and stabilisation of the arc. Also it meets the special requirements of the dip transfer welding. GMAW wire feeding units are designed to maintain the feed speed constant at a preset value irrespective of any variations in the arc behaviour. Thus, the GMAW system consists of a power source with constant voltage characteristics and wire feeder with constant feed speed. In these systems if arc length tends to change, the current varies significantly and the burn off behaviour acts in such a way as to counteract the change in arc length.

Increase in the arc length results an increase in arc voltage & the power source output current must decrease in order to meet the higher voltage demand. Since wire melting rate is dependent, the reduced current will result in reduced melting rate and since less wire is consumed and the arc length is shortened. Shortening the arc length will produce an increase in current, increased melting rate and again the arc length will return to its original value. In this way the Constant Voltage power source provides a self adjusted arc.

Posted Date: 9/17/2012 1:10:33 AM | Location : United States

Related Discussions:- Gmaw power source, Assignment Help, Ask Question on Gmaw power source, Get Answer, Expert's Help, Gmaw power source Discussions

Write discussion on Gmaw power source
Your posts are moderated
Related Questions
Q. Design Air Coolers for plant layout? As air coolers (sometimes called aerial coolers, or fin-fans) have extensive heat transfer surfaces, they are more vulnerable to failure

Determine the Brake power of an Engine which is running at a fixed speed of 300 r.p.m. and carries a rope brake Dynamometer. The Dead weight on the spring balance and engine readin

how can I add decibels

1. Production Capacity : Machines idled by breakdowns cannot produce thus the capacity of the systems is reduced. 2. Production cost: Labor costs per unit rise beca

TERMINOLOG Y: 1 .     Top dead and Bottom dead Centre: These are 2 extreme positions between which the piston reciprocates inside the cylinder. TDC and BDC have relevance

Careful consideration of the bioreactor agitation and aeration system is required in order to maintain a homogeneous environment and provide sufficient oxygen transfer rates to mee

Draw complete shear and moment diagrams for a 3 m long cantilever beam having a uniform distributed load of 2 kN/m along its length.

Show that the entropy maximum principle encountered in the study of isolated system is equivalent to the statement that the nonflow exergy of an isolated system is destined to decr

A modified NRZ code known as enhanced-NRZ (E-NRZ) operates on 7-bit words; inverting bits 2,3,6 and 7; and adding one parity bit to each word. The parity bit is chosen to make the