In order that the electrodes from different manufacturers may be identified as certain types, a code for classification of electrodes was prepared BS 1719. The code is made up as follows: Prefix LetterDenotes the method of manufacture. If more than one method used the coding is according to the predominant method. Type of Flux Covering: 1st DigitThis digit, the 'hundreds' digit, indicates the type of coating and therefore gives some idea of the operating characteristics. 1 High cellulose content Welding Position: 2nd DigitThis digit, the 'tens' digit, indicates the welding position for which the electrode is suitable. 0 - F, H, V, D, O When the electrode is coded as suitable for vertical and overhead positions, it should be understood that sizes larger than 6 S.W.G. (or 8 S.W.G. for iron power electrodes) are not normally used for welding in these positions. Welding Current and Voltage Conditions: 3rd DigitThis digit, the 'units' digit, indicated the recommended operating characteristics. Digit Welding Current And Voltage Conditions0 - D+ Special Characteristics: SuffixesIn the coding of an electrode with special characteristics a suffix letter, as defined below, is used. P - Deep penetration electrodes as specified in BS 5639 'Covered Electrodes for the Metal Arc Welding of Mild Steel' H - Hydrogen - controlled electrodes J - Iron power electrodes with a metal recovery of 110 to 130% of the core wire weight K - Iron powder electrodes with a metal recovery of more than 130% of the core wire weight. |