CWI Fundamentals Tech 2 — Questions and Answers
Question 1: Which welding position is designated as 'overhead' per AWS terminology?
- 1G
- 2G
- 3G
- 4G (Correct answer)
Correct answer: 4G
The 4G position designates overhead groove welding per AWS classification.
Question 2: What is the primary purpose of a preheat in welding?
- Increase travel speed
- Reduce hydrogen cracking risk (Correct answer)
- Improve arc stability
- Decrease filler metal consumption
Correct answer: Reduce hydrogen cracking risk
Preheat slows the cooling rate and allows hydrogen to diffuse out, reducing the risk of hydrogen-induced cracking.
Question 3: A welder qualification test using a 1-inch plate in the 3G position qualifies the welder for which plate thicknesses?
- 3/16 in. to 1 in. only
- 3/16 in. to 2 in. (Correct answer)
- 1/8 in. to unlimited
- 1 in. to unlimited
Correct answer: 3/16 in. to 2 in.
Per AWS D1.1, a 1-inch test plate in 3G qualifies from 3/16 inch up to 2 inches maximum.
Question 4: What type of current is typically used with SMAW electrodes classified as EXX10?
- DCEP (reverse polarity) (Correct answer)
- DCEN (straight polarity)
- AC only
- Either AC or DCEP
Correct answer: DCEP (reverse polarity)
EXX10 electrodes require DCEP (electrode positive) to operate correctly with their cellulosic flux coating.
Question 5: When measuring arc voltage, where should the measurement be taken?
- At the power source terminals
- As close to the arc as possible (Correct answer)
- At the ground clamp
- At the electrode holder
Correct answer: As close to the arc as possible
Arc voltage must be measured as close to the arc as possible to account for cable resistance losses.
Question 6: Which discontinuity is most likely to result from excessive travel speed in GMAW?
- Porosity
- Undercut
- Overlap
- Incomplete fusion (Correct answer)
Correct answer: Incomplete fusion
Excessive travel speed reduces heat input and can cause the weld metal to freeze before fusing properly with the base metal.
Question 7: What does the 'F' number system classify in AWS welding procedures?
- Filler metal groupings for welder qualification (Correct answer)
- Flux classifications
- Ferrite content of stainless welds
- Flow rate of shielding gas
Correct answer: Filler metal groupings for welder qualification
F-numbers group filler metals by usability characteristics so that qualification with one filler qualifies for all lower F-number fillers.
CWI Fundamentals Tech 2
Which welding position is designated as 'overhead' per AWS terminology?