AWS A5.3-A5.3M:1999 pdf download.Specification for Aluminum and Aluminum-Alloy Electrodes for Shielded Metal Arc Welding
6. Units of Measure and Rounding-Off Procedure
6.1 This specification makes use of both U.S. Customary Units and the International System of Units (SI). The measurements are not exact equivalents; therefore, each system must be used independently of the other without combining in any way. The specification with the desig-nation A5.3 uses U.S. Customary Units. The specifica-tion A5.3M uses SI Units. The latter are shown in appropriate columns in tables or within brackets [ ] when used in the text.
6.2 For the purpose of determining conformance with this specification, an observed or calculated value shall be rounded to the nearest 1000 psi [10 MPa] for tensile strength, and to the“nearest unit" in the last right-hand place of figures used in expressing the limiting value for other quantities in accordance with the rounding-off method given in ASTM E 29, Practice for Using Signifi-cant Digits in Test Data to Determine Conformance with Specifications.
7. Summary ofTests
The tests required for each classification are specified in Table 2. The purpose of these tests is to determine the chemical composition of the core wire and the mechani-cal properties of the weldment. The base metal for the weld test assemblies, the welding and testing procedures to be employed, and the results required are given in Sec-tions 9 through 12.
8. Retest
8.1 If the results of any test fail to meet the requirement,that test shall be repeated twice. The results of both tests shall meet the requirement. Specimens or samples for re-test may be taken from the original test assembly or sam-ple, or from a new test assembly or sample. For chemical analysis, retest need be only for those specific elements that failed to meet the test requirement.
8.2 If the results of one or both retests fail to meet the re-quirement, the material under test shall be considered as not meeting the requirements of this specification for that classification.
8.3 In the event that, during preparation or after comple-tion of any test, it is clearly determined that prescribed or proper procedures were not followed in preparing the weld test assembly or test specimens or in conducting the test, the test shall be considered invalid, without regard to whether the test was actually completed, or whether the test results met, or failed to meet, the requirement.That test shall be repeated, following the proper pre-scribed procedures. In this case the requirement for dou-bling the number of test specimens does not apply.AWS A5.3-A5.3M pdf download.