Gmaw power source, Mechanical Engineering

GMAW POWER SOURCE

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
What is the tesisting force

A pelton wheel works at the foot of a dam because of which the head available at the nozzle is 220m. the nozzle diameter is 20 c.m. and coefficient of speed 0.98. The wheel operate

The Contractor is responsible for obtaining all drawings, standards and specifications referred to in the bid documents and to request as needed additional or missing reference dat

Note on scale and sludge?

Suspension System, Wheels and Tyres:  There are numerous types of suspensions for connecting the wheels to frame body. The suspension plays the vital role in handling and driving

Explain Roughness width and Roughness width cut off? Roughness width: - Roughness width is the distance parallel to the normal surface between successive peaks or ridges whic

When and why the Multi-plate clutch is used ? Illustrate the working and constructional features of a multi-plates dry clutch. Describe clearly the necessity of a transmission s

Communication Protocols Applicable in Holonic Manufacturing System Communication amongst agents plays an essential role in the Holonic manufacturing system. Exchange of informa

Masonry Arch Culverts: Brick or stone masonry arches were very popular forms for culverts till recently. The disadvantage with this form is the unavoidable humps in the longi

SAFETY IN TIG WELDING-Gaseous and Metal Fumes Hazards The major toxic gases associated in TIG welding are ozone, nitrogen dioxide and phosgene gas. Metal fumes are also produced