Welding Certification — Knowledge Practice
Electrodes and filler metals: practice questions
Our Welding Knowledge bank has 17 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
What does the 'T' in E71T-1 indicate?
- A tubular (flux-cored) electrode
- Tungsten
- Thin wire suitable only for sheet metal
- Titanium
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A. A tubular (flux-cored) electrode — The '1' after 7 means all positions.
Question 2
What does the '18' in E7018 indicate?
- Tensile strength
- The positions (1 = all) and the coating and current: low-hydrogen iron powder, AC or DCEP
- The electrode length
- The minimum yield strength
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B. The positions (1 = all) and the coating and current: low-hydrogen iron powder, AC or DCEP — The third digit gives the positions; the last two digits together give the coating type and usable current.
Question 3
Which electrode can run on AC and is similar to E6010?
- ER70S-6
- E7024
- E7018 only
- E6011
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D. E6011 — E6011 has a cellulose-potassium coating.
Question 4
Which electrode is a low-hydrogen electrode?
- E7018
- E6010
- E6011
- E6013
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A. E7018 — Low-hydrogen electrodes reduce cracking in thicker or higher-strength steels.
Question 5
What does the 'S' in ER70S-6 indicate?
- Slag-forming
- A solid wire
- Spray transfer only
- Stainless steel
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B. A solid wire — The '6' indicates its chemical composition (deoxidisers).