AWS Filler Metals & Consumables 1 — Questions and Answers
Question 1: In the AWS electrode classification E7018, what does the number '70' represent?
- Minimum tensile strength of 70,000 psi (Correct answer)
- Electrode diameter of 7/0 inches
- Welding current of 70 amps
- Iron powder content of 70%
Correct 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.
Question 2: What does the third digit '1' in the AWS electrode classification E7018 indicate?
- The electrode is suitable for all welding positions (Correct answer)
- The electrode is for flat position only
- The electrode uses AC current only
- The electrode has 1% iron powder content
Correct 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.
Question 3: Which SMAW electrode classification uses a high cellulose sodium coating and strictly requires DC electrode positive (DCEP) current?
- E6010 (Correct answer)
- E6013
- E7018
- E7024
Correct 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.
Question 4: Why must low-hydrogen electrodes (such as E7018) be stored in a heated oven at 250–300°F (121–149°C)?
- To prevent moisture absorption into the coating (Correct answer)
- To increase electrode ductility before use
- To maintain the electrode's rated current capacity
- To prevent surface oxidation of the steel core
Correct 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.
Question 5: In AWS filler metal classification, what does the prefix 'ER' stand for?
- Electrode or Rod (Correct answer)
- Extra Reinforced
- Enhanced Resistance
- Electrode Rated
Correct 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).
Question 6: In the AWS classification ER70S-6, what does the 'S' designate?
- Solid wire (Correct answer)
- Stainless steel alloy
- Special low-alloy composition
- Submerged arc application
Correct 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.
Question 7: Which AWS specification covers carbon steel electrodes for shielded metal arc welding (SMAW)?
- AWS A5.1 (Correct answer)
- AWS A5.18
- AWS A5.20
- AWS A5.17
Correct 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.
AWS Filler Metals & Consumables 1
In the AWS electrode classification E7018, what does the number '70' represent?