What is special about decomposition products and additives of a cellulose-based electrode that helps an electric arc during welding to be less spread out? What would be a feasible mechanism linking this phenomena with decomposition product and plasma column composition during arc welding? Typical welding handbooks and references merely state the phenomena (i.e. punchy arc by H2/CO) without explaining the mechanism behind (e.g. what chemical characteristic of these two gases provide the "punch" and penetration of arc).
In general, what are the mode of action of chemical additives of an welding arc that modifies its welding penetration characteristics?
Dear Sumit Bhowmick
The cellulosic electrode can create a punchy arc, therefore, higher penetration can be obtained (and that is due to the shielding gas creation from the flux which usually contains Hydrogen and Co2)
Having Hydrogen and Co2 will increase the heat input and form a deeper penetration weld pool) please take a look on the link below
https://www.twi-global.com/technical-knowledge/job-knowledge/comparison-of-the-use-of-rutile-and-cellulosic-electrodes-142
I hope you got the benefit from my explanation
Thank you & good luck
Whilst CO2 is the main shielding gas formed during welding of both rutile and basic electrodes, in the case of cellulosic electrodes there is the formation of hydrogen and CO2. The high percentage of hydrogen is the cause of the high deposition rate and deeper penetration by the creation of the punchy arc .
I agree with André, hydrogen arc is characterized by higher temperature in respect to air, oxygen or carbon dioxide ar in other rutilic or basic electrodes. As a consequence the it can provide deeper penetration in the weld.
https://www.sciencedirect.com/science/article/abs/pii/S0371195156800271
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