AWS A5.15:1990 pdf download.Specification for Welding Electrodes and Rods for Cast lron
8.2 Preparation of the weld test assembly shall be as prescribed in 8.3 and Figure I. The base metal for the assembly shall be gray iron, nodular iron, or carbon steel. Testing of the assembly shall be as prescribed in 9.2 and 9.3
8.3 Weld Pad. When required by Table 2, a weld pad shall be prepared as specified in Figure 1. Base metal of any convenient size, of the type specified in 8.2， shall be used as the base for the weld pad.The surface of the base metal on which the filler metal is deposited shall be clean. The pad shall be welded in the flat position with multiple beads and multiple layers to obtain undiluted weld metal. The preheat temperature shall not be less than 60°F (16°C) and the interpass temperature shall not exceed 300°F (150°C). The slag shall be removed after each pass. The pad may be quenched in water between passes. The dimensions of the completed pad shall be as shown in Figure I, for each size of electrode. Testing of this assembly shall be as speci-fied in 9.2.
9. Chemical Analysis
9.1 For solid fller metal classified in Table lA, and the core wire for electrodes classifed in Table lB, a sample of the filler metal, core wire, or the rod stock from which the filler metal or core wire is made,shall be prepared for chemical analysis. Solid filler metal, when analyzed for elements that are present in a coating (copper flashing, for example), shall be analyzed without removing the coating. When the fller metal is analyzed for elements other than those in the coating, the coating shall be removed if its presence affects the results of the analysis for other elements. Rod stock analyzed for elements not in the coating may be analyzed prior to apply-ing the coating.
9.2 For electrodes classified in Table 1A, a sample shall be analyzed in the form of weld metal, not filler metal. The sample for analysis shall be taken from weld metal obtained with the filler metal. The sample shall come from a weld pad as shown in Figure 1. The top surface of the pad described in 8.3 and shown in Figure 1 shall be removed, dis-carded, and a sample for analysis shall be obtained from the underlying metal by any appropriate mechanical means. The sample shall be free of slag.For covered electrodes 1/8 in. (3.2 mm) and smaller and flux cored electrodes .052 in. (1.3 mm) diameter and smaller, the sample shall be taken at least 7/16 in. (11 mm) from the nearest surface of the base metal. For covered electrodes larger than 1/8 in. (3.2 mm) diameter and fux cored electrodes larger than .052 in. (1.3 mm), the sample shall be taken at least 9/16 in. (14 mm) from that surface.AWS A5.15 pdf download.