Final answer:
In an ASME welder qualification test with open root using F3 electrodes, the welder qualifies on F3 electrodes in all positions tested, which includes cellulosic electrodes like E6010 or E7010, used for various industrial applications.
Step-by-step explanation:
In a typical ASME welder qualification test using an open root, if F3 electrodes are used all the way out, the welder qualifies on F3 electrodes in all positions in which the test is taken. This qualification includes welding processes using cellulosic electrodes such as E6010 or E7010, which are commonly used for pipeline welding and other industrial applications. The F number in welding electrodes correlates with the usability characteristics of the electrode, and using F3 electrodes typically means that the welder has demonstrated skill with a certain class of electrode with specific mechanical properties, deposition rates, and positions.
It's important to note that the ASME Section IX specifies the welding procedure specifications and performance qualifications for welders and welding operators. When a welder takes this test and successfully completes it, they are granted a range of qualifications pertaining to specific electrode types and positions dictated by the procedures of the test.