By American Welding Society
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For a given electrode there can be a considerable difference between impact test results from one assembly to another, or even from one impactspecimen to another, unless particular attention is given to the welding procedure, details of specimen preparation (even its location within the weld), temperature of testing, and the operation of the testing machine. 2 Electrodes coveredby the specification are capable of producingweld deposits thatmeetmostradiographic quality requirements. 3 The specification classifiestwelvedifferent types of flux cored electrodes.
The lower the WallNeutrality Number, the more neutral is the flux. Determination of the Wall Neutrality Number (N) can be accomplished in accordance with the following guidelines: (1) A weld pad of the type required in the specification is welded with the electrode-flux combination being tested. Welding parametersare the same as those specifiedfor the weld testplate for the diameter electrode being used. (2) A second weld pad is welded using the same parameters, except that the arc voltage is increased by 8 volts.
In the case of the example, if the chemical composition does not meet the composition specified for any of the classifications in the specification, the filler metal still can be included within the “ G ’ classification. The purpose is to allow a useful filler metal one that otherwise would haveto await a revision of the specification - to be classified immediately, under the existing specification. This means, then, that two filler metals - each bearing the same “ G ’ classification may be quite different in some respect (chemical composition, again, as an example).
American Welding Society - User's Guide to Filler Metals by American Welding Society