Types of coated electrodes-cellulosic electrodes, Mechanical Engineering

Cellulosic Electrodes

In the AWS E 6010 and E 6011 series of electrodes, the protective covering is composed of cellulose (C6H10O5) and silicate binders. The cellulose decomposes in arc accordings to the following equation:

(C6 H10 O5 + 0.5 O2 = 6 C+ 5 H2)
Cel lulose + Oxygen = Carbon Monoxide + Hydrogen.

The products of this reaction, carbon monoxide and hydrogen represent a total of 400 times increase in the volume of gas generated over the volumes of the unburnt coating. These gases rush outward from the arc and push the atmosphere away from the puddle. The gas produced raises arc voltage and thereby increases the amount of heat produced from the electricity in the arc. The cellulose electrode has therefore, a very hot arc even at lower current value and this together with the gases evolved from the coating at high pressure give rise to a "digging" arc and deep penetration. Naturally there is very little slag formed, and this makes welding possible in all positions.

This electrode is extremely good for pipe welding. The weld metal is of good quality. It generally meets with high pressure tests  &  X - ray tests very easily. This electrode requires a slightly longer arc for complete burning of the cellulose in the flux coating.

Posted Date: 9/14/2012 5:04:23 AM | Location : United States







Related Discussions:- Types of coated electrodes-cellulosic electrodes, Assignment Help, Ask Question on Types of coated electrodes-cellulosic electrodes, Get Answer, Expert's Help, Types of coated electrodes-cellulosic electrodes Discussions

Write discussion on Types of coated electrodes-cellulosic electrodes
Your posts are moderated
Related Questions
Explain about the Deep foundation Deep foundations are those where the depth D is much larger than B. Piles, wells, piers and caissons belong to this group.

example on operation sheet?

how do I Create appropriate costing systems and techniques for specific engineering business functions.

Stress strain curves for the brittle materials: Stress strain curves for the brittle materials : Materials which show small elongation before they fracture are called as br

applications of dynamically induced emf

In a nuclear power plant saturated steam at 30 bar enters a h.p. turbine and expands isentrophically to a pressure at which its quality is 0.841. At this pressure the steam is pass

Environments can cause deterioration of foundation. Can you explain this in the following cases? a) A column footing which was stable for a number of years suddenly gave way. T

Custom-Designed Lap Joint Flanges Practices relative to lap-joint flanges, that experience has shown will result in a level of damage tolerance, leak-tightness integrity, and g

A pelton wheel works at the foot of a dam because of which the head available at the nozzle is 400m. The nozzle diameter is 160mm and the coefficient of velocity is 0.98. The diame

Position of centre of gravity of the frustrum of a cone: situate the position of C. G. of the frustrum of a cone with height H = 12 cm and with  diameter 8 cm and 12 cm at top