AWS A5.31M/A5.31 pdf free download

AWS A5.31M/A5.31 pdf free download.Fluxes for Brazing and Braze Welding.
5. Certification By affixing the AWS specification and classification designations to the packaging or the classification to the product, the manufacturer certifies that the product meets the requirements of this specification.7 6. Rounding-Off Procedure For the purpose of determining compliance with the requirements of this standard, the actual test values obtained shall be subjected to the rounding-off rules of ASTM E29 or Rule A in Clause B.3 of ISO 80000-1 (the results are the same). If the measured values are obtained by equipment calibrated in units other than those of the specified limit, the measured values shall be converted to the units of the specified limit before rounding off. If an average value is to be compared to the specified limit, rounding off shall be done only after calculating the average. An observed or calculated value shall be rounded to the nearest unit in the last right-hand place of figures used in expressing the limiting values for other quanti- ties. The rounded-off results shall fulfill the requirements for the classification under test. 7. Summary of Tests 7.1 The tests required for each fux classification are specified in Table 2. The purpose of these tests is to determine the water content, the maximum particle size, and adhesion to a test specimen. The tests are also used to determine the fluidity at high temperature, the fluxing action, the brazing fller metal flow, and the active life of the flux at high temperature. The base metal for the test specimen, the filler metal, and the testing procedures to be employed, and the results required are given in Clauses 9 through 19 and in Table 3. 7.2 Shelf Life. When stored in its original unopened container, these materials shall meet the requirements of this specification for a minimum shelf life of 12 months from date of manufacture. Flux beyond the shelf life may be used if it continues to meet the user’ ‘s requirements. The user may wish to test flux over 12 months old to ensure that it meets the requirements of this specification. 8. Retests If the results of any test fail to meet the requirement, the test shall be repeated twice. The results of both retests shall meet the requirement. Samples for retest may be taken from the original test sample or from a new sample. 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 specification for that classification. In the event that during preparation or after the completion of any test, it is clearly determined that prescribed or proper procedures were not followed in preparing the test sample or in conducting the test, the test shall be considered invalid, without regard to whether the test was actually completed or whether test results met or failed to meet the requirement. That test shall be repeated following the proper prescribed procedures. In this case, the requirement for doubling the num- ber of test specimens does not apply.AWS A5.31M/A5.31 pdf download.