AWS A5.19 pdf free download
AWS A5.19 pdf free download.Magnesium Alloy Welding Electrodes and Rods.
6. Summary of Tests
The tests required for each classification are specified in Table 2. The purpose of these tests is to determine the chemical composition of the filler metal, soundness of the weld metal produced by gas metal arc welding, and the deposition characteristics of welding rods. The base metal fot the weld test assemblies, the welding and testing procedure to be employed, and the results required are given in Sections 8 through 11.
7. Retest
If the results of any test fail to meet the requirement, that test shall be repeated twice. The results of both retests shall meet the requirement. Material for retest may be taken from the original test sample or from one or two new samples. For chemical analysis, retest need be only for those specific elements that failed to meet the test requirement.
8. Weld Test Assemblies
8.1 Two weld test assemblies are required:
(1) The groove weld in Figure 1 for the usability of electrodes and the soundness of the weld metal
(2) The bead-on-plate weld in 8.4.1 for the usability of rods
8.2 Usability tests shall be made using electrodes and welding rods of each size. A filler metal that meets the requirements of the radiographic soundness test, when tested as an electrode, may also be classified as a welding rod without being subjected to the bead-on-plate test required for a welding rod. A filler metal that meets the bead-on-plate weld test requirements, when tested as a welding rod, shall also be tested as an electrode and meet the requirements of the radiographic soundness test in order to be classified as an electrode.
8.3 Groove Weld for Soundness and Usability of Electrodes
8.3.1 A test assembly shall be prepared and welded, as specified in Figure 1 and 8.3.2 through 8.3.4, using base metal of the appropriate type specified in Table 3. Testing of this assembly shall be as specified in Section 10, Radiographic Test.
8.3.2 Welding of the test assembly shall be done using the gas metal arc welding process with techniques and procedures specified by the manufacturer as to the conditions not covered herein.
8.3.3 Dimensions of the groove weld joint and the welding position shall be as specified in Figure 1 for the electrode diameter being tested. The backing material shall be of the same type as the base metal.
8.3.4 The preheat temperature for the test assembly shall be not less than 60°F (16°C) nor greater than 150°F (66°C), and the interpass temperature shall not exceed 150°F (66°C).
8.4 Bead-on-Plate Weld Test for Usability of Welding Rods
8.4.1 The test assembly shall consist of a sheet or plate approximately 6 in. (150 mm) by 12 in. (300 mm) on which a weld shall be made as specified in 8.4.2, using base metal of the type specified in Table 3. Examination of the assembly shall be as specified in Section 11, Bead- On-Plate Test.
8.4.2 Welding of the assembly shall be done in the flat position with the gas tungsten arc welding process employing alternating current and argon gas shielding. The base metal thickness and the welding current shall be compatible with that with which the rod being tested normally is used.
8.4.3 The completed weld beads shall be examined with the unaided eye (except for correction to normal vision) and shall meet the requirements specified in Section 11, Bead-On-Plate Test.
8.4.4 A welding rod meeting the bead-on-plate test requirements using gas tungsten arc welding is also suitable for use with the oxyfuel gas and the plasma arc welding processes.
9. Chemical Analysis
9.1 A sample of the filler metal, or the stock from which it is made, shall be prepared for chemical analysis.
9.2 The sample shall be analyzed by accepted analytical methods. The referee method shall be ASTM E35, Standard Test Methods for Chemical Analysis of Magnesium and Magnesium Alloys.
9.3 The results of the analysis shall meet the requirements of Table 1 for the classification of electrode or rod under test.AWS A5.19 pdf download.
