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Degassers

The process of melting, alloying and preparing molten metal for casting billet or ingot results in three measure problems:

1. Hydrogen contamination of metal.
2. Non-metallic inclusion in melt.
3. Presence of undesirable trace element.

These three problems can be controlled in aluminium alloy making extrusion billet, ingot and casting operation by using Dhatukarm Degassers which :

 •  Minimises hard spots for easier machining
 •  Produce casting with high tensile strength, good elongation, maximum yield strength and free of pin holes
 •  Impart polished finish for plating and anodizing

In the degassing operation, rising gas bubbles remove H2 by diffusion into the bubbles.The oxides are dewetted and floated to the surface of the melt where they can be skimed off. The trace element react with chloride to form salts which are less dense than the aluminium and float to the surface.

Different grades of Dhatukarm Degassers and applications:

Degasser Colour Alloys type Function Application Rate Remarks
Degasser-20 Violet All Degassing 0.5-0.2 % Maximum Designning Potential
Degasser-19 Blue All Degassing and grain refining. 0.5-0.2 % General type used for most applications
Degasser-40 Violet All except Al-Mg alloys Degassing 0.5-0.25 % Low fumes used when slight sodium pick up is acceptable.
Degasser-41; Dark BlueDark All except Al-Mg alloys Degassing and grain refining. 0.5-0.25 % Used when slight sodium pick up is acceptable,low fumes
Degasser-60 Black All Degassing 0.15-0.2 % Slow bubble evolution, low fumes
Degasser-54 Pink All Mg and hypereutectic Al-Si alloys. Degassing and Na or Ca removal 0.2-0.6 % Application rate depends on Na or Ca contents in the melt