CWB Welding Inspector Level 3 Exam Prep (Latest 2024 / 2025 Update) Questions and Verified Answers | All Modules Covered | 100% Correct | Grade A
Question:
Fluxes that can dissolve the oxides on Al are ............
Answer:
Halide compounds ( Fluorine, chlorine, Bromine etc.)
Question:
Chlorine gas from a Chloride flux in presence of an arc can create poisonous gas called ..........
Answer:
Phosgene (COCL2) or Mustard gas produced by the reaction of chlorine and carbon monoxide in the presence of intense light
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Question:
Why are Chlorine fluxes removed completely from the weld region?
Answer:
bcz its hygroscopic. The part will be susceptible for corrosion
Question:
What is the drawback of the SMAW welding of Al with Chlorine coated electrodes?
Answer:
- Cause Lack of Fusion
- electrodes restricted to Al - Si, Al-Mg-Si and Al- Mg-Si-Cu alloys welding
- It cannot be applied to a high magnesium-containing alloy such as
only
AA5083.
Question:
At what temp does Al melts?
Answer:
660 C
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Question:
At what temp does Al oxides melts ?
Answer:
2072 C
Question:
True / False?
Fluxes are not a viable route to remove the oxides on the surface during welding
Answer:
True
Question:
The thermal conductivity of Al is ......... times that of steel
Answer:
4
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Question:
True / False?
Among Al alloys ,the thermal conductivity can vary by a factor of two and has a pronounced effect on the welding parameters.
Answer:
True, Alloying or impurity elements such as titanium , Lithium , magnanese and magnesium can lower the thermal conductivity
Question:
The melting point of the oxides on the Al surface is ....... times greater than the melting point of the metal
Answer:
3
Question:
True / False?
For Al, for the same welding energy input, weld penetration varies by the ratio of the thermal conductivity of 6061 T6 (167 W/mK) to that of AA-5083- O (117W/mK), which is 1.43
Answer:
True
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