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
Mollier diagram: Mollier diagram is chart drawn between enthalpy H (on ordinate) and entropy or S (on abscissa). It is also called as H-diagram. It depicts properties of water

hiw can i fix the maximum temp of the aluminium


Evaluate the least pull, through the center of wheel: A uniform wheel having 600 mm diameter, weighing 5KN rests against rigid rectangular block of 150mm height as shown in t

Q. Ultrasonic Examination? Ultrasonic examination, UT and the acceptance criteria shall be in accordance with the Code and performed in accordance with written procedures. W

Illustrate in brief the types of power plant? Illustrate the factor to be considered for site selection in hydro power plant? a) Compare stream power plant with hydro power p


A sign of uniform density weighs 270 lb and is supported by a ball-andsocket joint at A and by two cables. Determine the tension in each cable and the reaction at A.