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40 questions from the welding fundamentals and inspection practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
Which type of welding power source output is used for SMAW?
A. Constant current
SMAW uses a constant-current (drooping) machine so that the amperage stays close to the set value as the welder's arc length changes by hand. Constant-voltage machines are used for wire-fed processes such as GMAW and FCAW, where the arc self-adjusts.
Reference: Welding power sources: constant current vs constant voltage
In the classification E7018, what does the third digit, 1, tell the welder?
B. The electrode can be used in all positions
The next-to-last digit is the position digit: 1 means all positions, 2 means flat and horizontal fillets only. Polarity and coating type come from the last digit read together with the position digit, not from the position digit alone.
Reference: AWS A5.1 electrode classification: position digit
A pipe welder needs a deep, digging arc with a fast-freezing puddle for an open-root pass run on DCEP. Which electrode is designed for that?
A. E6010
E6010 has a high-cellulose coating that gives a forceful, deeply penetrating arc and a thin, fast-freezing slag, which is why it is the classic open-root electrode. E7018 has a softer arc and a heavier slag, and E7024 is a high-deposition flat and horizontal electrode.
Reference: SMAW electrode groups: fast-freeze, fast-fill, fill-freeze, low-hydrogen