Electrode wire for co2 welding, Mechanical Engineering

Assignment Help:

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.


Related Discussions:- Electrode wire for co2 welding

Hartung governer., #quesThe spring controlled governor of the “Hartung” typ...

#quesThe spring controlled governor of the “Hartung” type has two rotating masses each of 3.5 kg and the limits of their radius of rotation are 100 mm and 125 mm. The each mass is

Classification based on type of welding, Classification Based on Type of We...

Classification Based on Type of Welding  Fusion welding : These processes involve fusion of the base metal to complete the weld. Fusion welds generally  do  not  require  thea

Diamond crossing, Diamond Crossing: Two tracks crossing one another i...

Diamond Crossing: Two tracks crossing one another is known as a diamond crossing. The component of a Diamond Crossing are indicated in Figure. Figure: Diamond Cross

Cam, Ask question explin opiz code #Minimum 100 words accepted#

Ask question explin opiz code #Minimum 100 words accepted#

Determine the damping ratio and undamped natural frequency, With the assist...

With the assistance of the airplane information and the Dutch roll approximation values shown in Table Q3: Table Q3 (a)  Determine the Dutch roll eigenvalues. (b)  Dete

Calculate stress to cause failure - creep parameters, Calculate stress to c...

Calculate stress to cause failure - Creep Parameters: From creep tests on 713 C alloy the constant C in Larson-Miller parameter is determined as - 85.75. In rupture test a spe

Explain systematic way to reach a 2d formation, Question 1: There are d...

Question 1: There are different devices which may be used to attract the attention of the customers and persuade them to purchase merchandise. a) Make a list of at least te

Define conceptual engineering phase for project, Q. Define Conceptual Engin...

Q. Define Conceptual Engineering Phase for project? The primary objective of this stage is to include and clearly define the economic feasibility of the project, sensitivity to

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