Frequently Asked Questions
The depth of the flux burden is often poorly controlled in practice and the powder is simply heaped around the wire until the arc is completely covered. For optimum results, the flux depth should be just sufficient to cover the arc although, at the point where the electrode enters the flux cover, light reflected from the arc should be just visible. With too shallow a flux burden, the arc may flash through and can cause porosity and a rough surface because of inadequate protection of the molten metal. Too deep a flux burden can also give poor bead appearance and can lead to spillage on circumferential welds. On deep preparations in thick plate, it is particularly important to avoid an excessive flux cover as weld bead shape and slag removal can be unsatisfactory.