Gas metal arc welding-principle of operation, Mechanical Engineering

Assignment Help:

GAS METAL ARC WELDING-PRINCIPLE OF OPERATION

Gas Metal Arc Welding (GMAW) is one of the arc welding processes in which an electric arc is formed and maintained between a continuously fed filler metal electrode wire and the weld pool. In the arc heat, the electrode wire is melted and the molten metal (droplets) is transferred across the arc into the weld pool. The arc and the weld pool is shielded from the atmospheric contamination by an externally supplied shielding gas. The shielding gas can be Argon, CO2 or Argon + CO2 gas mixture depending on the type of base metal being welded. Generally for welding of non ferrous metals argon is used as the shield gas and then the process is called as Metal Inert Gas (MIG) welding.

 

For welding of ferrous metals, CO2 or Argon + CO2 gas mixture is used and then the process is called as Metal Active Gas (MAG) welding. The process is found to provide a stable arc and good process control when a direct current (DC) power source is employed with electrode positive (DCEP) polarity. The DCEP provides stable arc, greater heat input to the cathodic base metal for good penetration and a fluid weld pool. Equipment required for GMAW is shown. The system comprises of a DC power source with flat characteristics, wire feed unit, welding gun, cable assembly and gas cylinder. The wire electrode is fed continuously into the arc by the wire feed unit at a speed preset by the operator. The wire feed rate can be varied generally from 1 m / min. to 20 m / min. For a given wire material and diameter, the arc current is determined by the wire feed rate. The required voltage is selected by adjusting the voltage control knobs provided at the power source.

 

1255_gas arc welding2.jpg


Related Discussions:- Gas metal arc welding-principle of operation

Estimate what fraction of heat loss by the fin, A tube assembly constructed...

A tube assembly constructed of Cu with an inside diameter of 1.25 cm, wall thickness of 0.8 mm and circumferential fins around the periphery. The fins have thickness of 3 mm, and a

What is stormwater treatment, Q. What is Stormwater Treatment? Normally...

Q. What is Stormwater Treatment? Normally, stormwater run-off from process areas needs to be collected and treated before being discharged to land or water. Often, large aerobi

Objectives-computerized scheduling and control manufacturing, Objectives ...

Objectives After studying this section, you should be familiarized about: The typical job shop scheduling problem, Characteristics of computer controlled scheduling,

Explain the intensive properties of a system, Explain the Intensive Propert...

Explain the Intensive Properties of a System Intensive properties are those, which have similar value for any part of the system or the properties which are independent of the

Group technology, What is the basis for forming graphs in group technology

What is the basis for forming graphs in group technology

Equilibrium diagram, what do understand by the term equilibrium diagram

what do understand by the term equilibrium diagram

Describe law of gearing, Determine an expression for the minimum number of ...

Determine an expression for the minimum number of teeth on a pinion which is in mesh with a rack in order to avoid interference and show the minimum number of teeth needed on a pin

Low alloy creep resisting and electrodes for cryogenic , LOW ALLOY CREEP RE...

LOW ALLOY CREEP RESISTING ELECTRODES AND ELECTRODES FOR CRYOGENIC APPLICATIONS The flux coating contains small amount of alloying elements like Cr, Mo and sometimes V for creep r

Calculate the vertical deflection - cantilever, Calculate the vertical defl...

Calculate the vertical deflection: Calculate the vertical deflection at the tip of the cantilever shown in Figure Figure Solution Measuring the distance x f

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