Shielding gas, Mechanical Engineering

SHIELDING GAS

The primary function of the shielding gas is to exclude the atmospheric air from the arc zone. However, the shielding gas has significant influence on the arc characteristics, mode of metal transfer, speed of welding, cleaning action and bead geometry. Pure argon is used only for welding of non ferrous metals. However, pure argon shielding on ferrous alloys causes an erratic arc and a tendency for undercut to occur. Hence, for welding of ferrous alloys, either CO2 or argon + CO2 gas mixture is used. Addition of 1 to 5 % O2 or 3 to 25 % CO2 produce a noticeable improvement in arc stability and freedom from undercut. Argon rich gas mixtures produce a finger shape penetration whereas CO2 shielding gas produces wider and deep penetration.

Posted Date: 9/17/2012 1:38:55 AM | Location : United States







Related Discussions:- Shielding gas, Assignment Help, Ask Question on Shielding gas, Get Answer, Expert's Help, Shielding gas Discussions

Write discussion on Shielding gas
Your posts are moderated
Related Questions
What are the Alluvial sediments Alluvial sediments are characterized by stratification or layering and fine grained soil layers have higher compressibility as compared to coars

Explain Objectives of Radial drill machine There are many objectives such like, 1.   With the help of angle drill machine, an angle hole can be produced at any angle.  2.

You are required to investigate the dynamic movement of a mass m sliding along a rod as shown in the diagram below. The rod is rotating at a constant angular velocity θ. The mass

The Cu-Sb system contains 2 eutectics, 1 eutectoid, 1 peritectic and 1 peritectoid. Mark them all on the figure, write down the temperature and composition of each point, and ident

Mas s Flow Rate (m ): In absence of any mass getting stored system we can write; Mass flow rate at inlet = Mass flow rate at outlet That is, m f1  = m f2 as m f  = d



find degree of the bezier curve

Lifting machines: Basic definitions of the lifting machines and some lifting machines have been described. For each of these machines, derivation of the formulae for mechanica

Maintenance of Railway Line Importance of Maintenance The need for maintenance of railway lines arises out of the following considerations : (a) The track rests on