Electrode wire for co2 welding, Mechanical Engineering

ELECTRODE WIRE FOR CO2 WELDING

CO2 welding wire must have a special composition to withstand the oxidising nature of the CO2 arc atmosphere. Though, CO2 is not reactive at room temperature, but at the high temperature of the arc it is dissociated into carbon monoxide and atomic oxygen.

CO2 = CO + O

Under these oxidising conditions, the carbon present in an unkilled weld pool would react with the oxygen and form carbon monoxide and thus form porosity. To prevent this from happening additions of deoxidisers are made to the CO2 welding wire to lock up the oxygen. Most CO2 welding wires are therefore added with silicon and manganese. The silicon and manganese remove the oxygen as a slag, which floats to the surface of the weld. Some wires also contain small additions of other deoxidisers such as aluminium, titanium and zirconium.

Solid wires for CO2 welding are commonly available in diameters of 0.8, 1.0, 1.2 and 1.6 mm. The choice of wire diameter for a particular application is extremely important since this decides the current range which can be used and the ease with which the welder can control the weld pool. The most commonly used wire sizes are: 0.8 mm for sheet steel. This allows low current to be used. 1.2 mm wire for thicker material. This diameter is versatile since, at low wire speeds, it can be used down to 80 A for the welding of sheet metal or the positional welding, Whereas at higher wire speeds currents up to 350 A can be used to give high metal deposition rates and deep penetration.

Posted Date: 9/17/2012 2:16:55 AM | Location : United States







Related Discussions:- Electrode wire for co2 welding, Assignment Help, Ask Question on Electrode wire for co2 welding, Get Answer, Expert's Help, Electrode wire for co2 welding Discussions

Write discussion on Electrode wire for co2 welding
Your posts are moderated
Related Questions
Explain the Semi-Automatic Extension of screw conveyor "Semi-Automatic Extension of screw conveyor as per the screed width by telescopic-tube" Procedure: The extension of

what are the practical applications and use of finding uniform distributed load, concentrated point load, inclined point load, roller supported beam.

I have an assignment on kinematic chains.I have to tell the type of chain whether it is locked,constrained or unconstrained?? I am facing problem in counting number of joints,pair

(a) Show following complex numbers in Rectangular forms : (i) 5e 0.927j (ii) 10e 4.068j (b) Show the periodic functions by Fourier series (Harmonic series).

A Common Cell Control Software  In this section, fine and common implemented cell control software are developed, that is based upon a transition table, to show the restriction

Find out the effort required to run this machine: The efficiency of a machine is 75% while an effort of 20 N is required to lift a load of 160 N. Compute the velocity ratio an

Draw shear force diagrams for the overhanging beam: Draw shear force & bending moment diagrams for the overhanging beam illustrated in Figure Figure  Solution

Hydraulic calculations are carried out by both Process and Mechanical Engineering. Generally speaking, Process Engineering will initiate many hydraulic calculations for piping sys

Q. Flange Assembly with Bolt Elongation Measurement? Bolt elongation measurement may be used, with COLT engineering approval, at flanges where Hydraulic Bolt Tensioners are imp

Q.  W rite down the basic formula for maximum bending moment in some ideal cases. Sol.:   Ber m together with nature of load Maximu