Filler Metals & Consumables Flashcards

In the AWS electrode classification E7018, what does the number '70' represent?

Answer: Minimum tensile strength of 70,000 psi

In AWS SMAW electrode classification, the first two digits after 'E' indicate the minimum tensile strength of the deposited weld metal in thousands of psi, so '70' equals 70,000 psi minimum.

What does the third digit '1' in the AWS electrode classification E7018 indicate?

Answer: The electrode is suitable for all welding positions

In AWS SMAW classification, a '1' in the third position indicates the electrode is suitable for all welding positions: flat, horizontal, vertical, and overhead.

Which SMAW electrode classification uses a high cellulose sodium coating and strictly requires DC electrode positive (DCEP) current?

Answer: E6010

E6010 has a high cellulose sodium coating that produces a forceful, deeply penetrating arc and requires DC electrode positive (DCEP); it cannot be used on AC.

Why must low-hydrogen electrodes (such as E7018) be stored in a heated oven at 250–300°F (121–149°C)?

Answer: To prevent moisture absorption into the coating

Moisture absorbed by a low-hydrogen coating decomposes during welding and introduces hydrogen into the weld metal, which can cause hydrogen-induced (cold) cracking.

In AWS filler metal classification, what does the prefix 'ER' stand for?

Answer: Electrode or Rod

Per AWS A5.18, 'ER' indicates the filler metal may be used as either a welding electrode (in a wire feeder) or a welding rod (hand-fed in GTAW).

In the AWS classification ER70S-6, what does the 'S' designate?

Answer: Solid wire

The 'S' in ER70S-6 designates that the filler metal is a solid wire, distinguishing it from tubular (flux-cored) or metal-cored electrodes.

Which AWS specification covers carbon steel electrodes for shielded metal arc welding (SMAW)?

Answer: AWS A5.1

AWS A5.1 is the specification for Carbon Steel Electrodes for Shielded Metal Arc Welding, classifying electrodes such as E6010, E6013, and E7018.