Why should the end of the welding rod be kept inside the flame envelope?
The reason of keeping the welding rod inside the flame envelope.
The atmospheric air is the culprit which oxidizes the molten weld pool, the outer portion of the flame protects the molten weld pool from the atmospheric air. The carbon mono oxide (CO) present in the outer flame combines with the atmospheric air to produce the carbon dioxide which acts as the inert gas and creates an envelope to protect the molten weld pool.
This carbon dioxide also forces the surrounding atmospheric air away from the weld.
To prevent the burnout, the welding torch is manipulated, tilted or raised in order to keep the molten metal enveloped with the flame during the solidification process...
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