CWB Welding - Chapter 4 (Metallurgy and Material Specification) Latest 2024 Graded A

CWB Welding - Chapter 4 (Metallurgy and Material Specification) Latest 2024 Graded A Alloy steels are typically used for: Tools and gears. Engineering materials are classified as metals and: Non-metals. Which of the following elements is used as an alloying element in steel and provides corrosion resistance? Nickel. True or False? Alloys are mixtures of metal with other metals or non-metals. True. What is the purpose of using limestone in the blast furnace to convert iron ore into pig iron? Limestone acts as a fluxing agent to form a slag and remove impurities. True or False? The basic oxygen furnace is use to produce pig iron. False. The term basic in the basic oxygen furnace refers to the: Basicity of the flux produced. Compared to the basic oxygen furnace, the electric furnace provides refining conditions that are: More controllable. True or False? Semi-killed steel is a class of steel produced from pig iron. True. The plates for the shell of a pressure vessel are usually formed with the rolling direction: Around the circumference. True or False? The ductility of a sample transverse to the direction of rolling will be greater than a longitudinal sample. False. When a plate is made, most of the rolling will usually take place in one direction, resulting in the formation of elongated inclusions. Elongated inclusions such as these are called: Stringers. When up to 0.8% carbon is added to iron, the resulting steel under equilibrium conditions will have a structure of: Ferrite and pearlite. A hypoeutectoid steel has: Less than 0.8% carbon. True or False? The FCC structure is more closely packed than the BCC structure. True. The extent to which a steel forms martensite at a given cooling rate is called: Hardenability. True or False? Normalizing of steel involves heating into the fully austenite region followed by furnace cooling. False. Hot rolling is carried out: In the fully austenitic region. Tempering martensite involves reheating to a temperature: Below the lower transformation temperature of 723 degrees. True or False? Controlled rolled, killed, fine grain steel has a higher impact energy than as-rolled, killed, fine grain steel. True. The three major steel groups are carbon steels, low-alloy steels and: Alloy steels. In the SAE/AISI steel designation 1020, what does the "20" mean? 0.2% nominal carbon. True or False? P groupings in ASME Section IX are used to group steels for procedure qualification testing. True. CSA Standard G40.21M steel designation, type 700 QT has: Been quenching and tempered. 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 In CSA standard G40.21M, what does the AT designation mean? Atmospheric corrosion-resistance weldable notch tough steel The carbon content for quenched and tempered steels used for earth moving and mining equipment will be: 0.2% C max. Resistance to tempering is a term that describes a material's ability to retain: hardness at high temperature. The process whereby steel is heat treated to a point where the structure transforms and new grains grow is referred to as: recrystallization. A benefit of many HSLA steels is improved atmospheric corrosion resistance. This may be _________ times more resistant than a carbon steel. 4 - 6 times Lamellar tearing in a welded connection can be mitigated by: reducing the volume of weld metal from complete to partial penetration. Two examples of grain refining elements are: aluminum and vanadium. If more than 0.8% carbon is added to iron the resulting material: will contain cementite and pearlite. What is the difference between annealing and normalizing? Normalizing is a treatment that involves heating into the fully austenitic region followed by air cooling. Annealing is a treatment which involves heating into the fully austenitic region followed by furnace cooling. Molten steel contains dissolved oxygen that tends to make the steel brittle. An alloying element that can be added to reduce the amount of oxygen is: aluminum. Alloy steels and steels with greater than 0.3% carbon are fully killed. True. During the rolling of a steel plate, non-metallic inclusions in the steel plate may produce: elongated inclusions. Which of the following materials is a ferrous alloy? Stainless steel What is the term that refers to the process of filling the ingot moulds with the molten metal from a refining furnace? Teeming. Thicker plates of the same steel designation will be designed with higher: carbon content than thinner plates. Ferrite is the phase that at room temperature contains almost: no carbon. Select the non-ferrous metal from the following. Copper. Steel with up to 0.8% carbon heated above 723 °C is: single phase austenite.