CWB Welding - Chapter 4
(Metallurgy and Material
Specification) Questions and
Answers Already Passed
Which of the following statements from ASTM A20/A20M is correct with regard to repairing of
certain defects in the plate? ✔✔Allows defects to be repaired by welding - only by agreement with
the purchaser.
Which elements are added to molten steel specifically for deoxidation purposes? ✔✔Silicon
and aluminum
When working with stainless steels, what does the term pickling refer to? ✔✔Chemical treatment
to remove the heat tint from welding
What designates that AISI 4340 refers to Nickel-Chromium-Molybdenum steel? ✔✔The first digit
The grouping of steels referred to as low alloy steels typically exhibit the following attributes: ✔✔A
low carbon content, high strength, and fine grain size
The grouping of steels referred to as carbon steels can obtain a wide range of properties by varying the:
✔✔carbon content.
A typical temperature for thermal stress relief treatment of welded fabrication is in the region of:
✔✔625 °C.
Which of the following steels will require the most stringent control of the welding procedure? ✔✔700Q
Fast cooling rates through the transformation temperature range (800 °C - 500 °C): ✔✔promotes
a coarser pearlite structure.
, Which element contained in HSLA steels will improve resistance to atmospheric corrosion? ✔✔Copper.
Temper rolled steels may be susceptible to strain ageing, and if stored for a period of time, may result in
irregular: ✔✔yielding when deformed.
Hot shortness is: ✔✔cracking susceptibility caused by high sulphur content.
A capped steel is similar to: ✔✔rimmed steel.
What phase distorts the BCC structure and results in a very hard needle-like structure? ✔✔Normally,
ferrite dissolves only a small amount of carbon distorts the BCC structure of the ferrite. This results in
a very hard needle-like structure called martensite.
Why can the properties of steel be changed through heat treatment? ✔✔Because of the phase
changes from BCC to FCC to BCC.
Carbon dissolved completely in the FCC structure of steel is known as: ✔✔austenite.
Ferrite, austenite, and cementite are know as: ✔✔phases.
The most common steel making process in use is the: ✔✔basic oxygen furnace.
In the basic oxygen furnace, what does the term "basic" refer to? ✔✔The chemical nature of
the refectory lining of the furnace
Which of the following is NOT involved in the steelmaking process? ✔✔Nitrogen furnace.
Which of the following is NOT a class of steel produced from pig iron? ✔✔Semi-rimmed steel
What is the most common method of steel processing? ✔✔Continuous casting
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