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
Define Cases in which Automation is Done Automation is done in following cases:- a) Loading and unloading of parts. b) Automatic production lines. c) Automatic tool ch

A large hydraulic cylinder is to be treated using autofrettage, taking 80% of the wall thickness into the plastic range. The external diameter of the vessel is 200mm and the inter


(a) Describe the types of wear and causes of wear. Draw figures whenever necessary. (b) Describe any 4 cutting tool materials in detail. (c) Describe the various reasons for

The Baseline Dimension Command You can use this command to generate a series of dimensions from a single base point. You must already have created the first dimension in the se


what is surging in turbo machines subject


how to calculate point of contraflexure in SFD and BMD

Q. Scraper Launchers and Receivers? Scraper launchers and receivers associated with the pipelines shall be located in open, well-ventilated areas with the opening directed away