3 Exam Prep Latest Update Questions and

CWB Welding Inspector Level

• 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 1 / 4

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 only

• It cannot be applied to a high magnesium-containing alloy

such as AA5083.

Question:

At what temp does Al melts?

Answer:

660 C 2 / 4

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 3 / 4

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

• / 4