ISO specifies requirements for classification of covered electrodes and deposited metal in the as-welded condition and in the post-weld heat-treated condition for manual metal arc welding of non-alloy and fine grain steels with a minimum yield strength of up to MPa or a minimum tensile strength of up to MPa. ISO is a combined specification providing for classification utilizing a system based upon the yield strength and the average impact energy of 47 J of all-weld metal, or utilizing a system based upon the tensile strength and the average impact energy of 27 J of all-weld metal.
Check out our FAQs. This standard has been revised by ISO Abstract ISO specifies requirements for classification of covered electrodes and deposited metal in the as-welded condition and in the post-weld heat-treated condition for manual metal arc welding of non-alloy and fine grain steels with a minimum yield strength of up to MPa or a minimum tensile strength of up to MPa.
The third mandatory symbol is for the composition. The fourth symbol indicates the type of flux coating - basic, rutile etc as shown in Table 4 for the symbols under System A see the standard for the symbols under System B, as this symbol also contains information on welding positions and suitable current for System B.
System B also contains a symbol which System A does not, which can describe whether electrodes properties are for the as-welded or post-weld heat treated condition. The next three symbols under System A are not compulsory and give additional information on the percentage weld metal recovery and the type of welding current on which the electrode can be operated Table 5 ; the welding position Table 6 and the maximum hydrogen content of the deposited weld metal if the electrodes are dried or baked as recommended by the manufacturer Table 7.
System B only makes use of the diffusible hydrogen symbol. A full designation may therefore read E42 2 B32H5. The classification comprises five characters but in there are two separate schemes.
It is thus possible to have virtually identical electrodes with different classifications, one using US units, the other SI units. There is insufficient space within this brief article to describe fully all of the types covered by the specification except perhaps for the most commonly used electrodes.
For full details of the AWS scheme it is necessary to consult the specification. To illustrate briefly how the electrodes are classified, the following gives a summary of the key features. The first character 'E' is common to both classifications and indicates that the electrode is a flux coated manual metal arc electrode. Explora Documentos. Cargado por lector Compartir este documento Compartir o incrustar documentos Opciones para compartir Compartir en Facebook, abre una nueva ventana Facebook.
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