ISO 14174:2019 pdf download – Welding consumables – Fluxes for submerged arc welding and electroslag welding – Classification
5.5.1 General
The metallurgical behaviour of a flux is characterized by the contribution (pick-up and/or burn-out) of alloying elements. Concerning fluxes for joining, the contribution is the difference between the chemical composition of the all-weld metal deposit and the composition of the specified electrode. Concerning fluxes for overlay welding, the contribution is the difference between the chemical composition of the deposited weld metal of the last bead/ layer and the chemical composition of the specified wire/strip electrode.
5.5.2 Metallurgical behaviour, flux class 1
For determining the pick-up and burn- out behaviour, a wire electrode ISO 14171-A – S2 or IS0 14171-B – SU22 shall be used in accordance with 5.5.6. The pick up or burn-out of the elements Si and Mn shall be stated in this sequence. The symbols in Table 2 indicate the metallurgical behaviour of a welding flux class 1.
5.5.3 Metallurgical behaviour, flux classes 2 and 2B
For determining the pick-up or burn-out behaviour, wire or strip electrodes shall be selected in accordance with Table 3 and shall be used in accordance with 5.5.6. The pick-up or burn-out of the elements C, Si, Cr, and Nb shall be stated in this sequence. If the flux adds other elements, these shall be indicated by stating the corresponding chemical symbols (e.g. Ni, Mo) immediately after the symbols for C, Si, Cr, and Nb. The symbols in Table 4 indicate the metallurgical behaviour for class 2 and class 2B fluxes.
5.5.6 Determination of symbols for metallurgical behaviour
For the determination of symbols for class 1 and 2 fluxes, a weld metal pad shall be prepared in accordance with Table 5. For class 3 and 4 fluxes, the weld pad shall be prepared as recommended by the manufacturer. The surface oxide on the sampling portion of the specimen for chemical analysis shall be removed by machining or grinding. When taking chips from a milling, a shaping or a drilling machine, the use of cutting fluid shall be avoided. The specimen for chemical analysis shall be taken from the weld metal of the highest layer. The specimen shall not include the start or the crater.
7 Rounding procedure
Actual test values obtained shall be subject to ISO 80000-1:2009, B.3, Rule A. If the measured values are obtained by equipment calibrated in units other than those of this document, the measured values shall be converted to the units of this document before rounding. If an average value is to be compared to the requirements of this document, rounding shall be done only after calculating the average. The rounded results shall fulfil the requirements of the appropriate table for the classification under test.
8 Retest
If any test fails to meet the requirement(s), that test shall be repeated twice. The results of both retests shall meet the requirement. Specimens for the retest may be taken from the original test assembly or sample or from one or two new test assemblies. For chemical analysis, retests need only be for those specific elements that failed to meet the requirement. If the results of one or both retests fail to meet the requirement, the material under test shall be considered as not meeting the requirements of this document for that classification. In the event that during preparation, or after completion of any test, it is clearly determined that prescribed or proper procedures were not followed in preparing the weld test assembly or sample(s) or test specimen(s), or in conducting the tests, the test shall be considered invalid. This determination is made without regard to whether the test was actually completed, or whether the test results met, or failed to meet, the requirements. That test shall be repeated, following proper prescribed procedures. In this case, the requirement for doubling the number of test specimens does not apply.