Welding Metallurgy MCQs with Explanations

inert gas arc welding is the correct answer to “Stainless steel is welded using”. This question is standard in competitive examination syllabi for Welding Metallurgy.

acidic is the correct answer to “The nature of submerged arc welding flux with basicity index of 0.5 is”. This question is standard in competitive examination syllabi for Welding Metallurgy.

the lap joints are easily made is the correct answer to “Lap joints are preferred over butt joints in soldering/brazing because”. This question is standard in competitive examination syllabi for Welding Metallurgy.

low contact angle with the base metal is the correct answer to “For a good quality brazing, the molten filler alloy should have”. This question is standard in competitive examination syllabi for Welding Metallurgy.

Both [a] and [r] are true and [r] is not the correct reason for [a] is the correct answer to “Determine the correctness or otherwise of the following Assertion [a] and the Reason [r] . Assertion: In a pure metal weld, elastic modulus in the heat affected zone (HAZ) is the same as that in the base metal. Reason: Coarse grained microstructure in the HAZ results in lower hardness.”. This question is standard in competitive examination syllabi for Welding Metallurgy.

decrease the cooling rate is the correct answer to “Preheating of steel plate during welding is required to”. This question is standard in competitive examination syllabi for Welding Metallurgy.

Flux cored arc welding is the correct answer to “Which of the following is not a solid state welding process”. This question is standard in competitive examination syllabi for Welding Metallurgy.

Gas tungsten arc welding is the correct answer to “Which one of the following welding processes uses a non-consumable electrode”. This question is standard in competitive examination syllabi for Welding Metallurgy.

fused part + HAZ + base metal is the correct answer to “A weldment consists of”. This question is standard in competitive examination syllabi for Welding Metallurgy.

preventing hot cracking is the correct answer to “Preheating prior to welding is done for the purpose of”. This question is standard in competitive examination syllabi for Welding Metallurgy.

P-2, Q-3, R-1 is the correct answer to “Match the joining processes in Group 1 with the filler material in Group 2 . Group 1 Group 2 P. Soldering 1. Silver-titanium alloy Q. Welding 2. Silver-tin alloy R. Brazing 3. Mild steel 4. Lead fluoride”. This question is standard in competitive examination syllabi for Welding Metallurgy.

both a and r are true, and r is the reason for a is the correct answer to “Determine the correctness or otherwise of the following Assertion (a) and Reason (r) . Assertion (a): During welding of aluminium alloys by the gas tungsten arc welding process, direct current reverse polarity (DCRP) mode is used. Reason (r): DCRP facilitate breaking up of the oxide film on the workpiece surface.”. This question is standard in competitive examination syllabi for Welding Metallurgy.

martensite formation is the correct answer to “"Cold cracking" in the heat affected zone of a high strength steel weld can take place because of”. This question is standard in competitive examination syllabi for Welding Metallurgy.

martensite forms in the heat affected zone leading to poor toughness/ductility of the weld is the correct answer to “Steels with high carbon equivalent have poor weldability because in these steels during welding”. This question is standard in competitive examination syllabi for Welding Metallurgy.

Friction stir welding is the correct answer to “Which of the following is not a fusion welding process”. This question is standard in competitive examination syllabi for Welding Metallurgy.

Q > R > P is the correct answer to “Of the following welding processes [P] Laser Beam Welding [Q] Submerged Arc Welding [R] Metal Inert Gas Welding the width of the heat-affected zone in decreasing order is”. This question is standard in competitive examination syllabi for Welding Metallurgy.

has better electron emissivity is the correct answer to “In TIG welding thoriated tungsten electrodes are used because it”. This question is standard in competitive examination syllabi for Welding Metallurgy.

P, R is the correct answer to “In the consumable electrode shielded metal arc welding process, which of the following observations are correct? P. The, weld composition does not depend upon the basicity of the slag. Q. Basic flux is used to achieve low hydrogen content-and low inclusion content in the weld metal. R. Reverse polarity of the direct current power source is used to weld thin sheets. S. Coated electrodes are classified by tensile strength of the weld metal deposit.”. This question is standard in competitive examination syllabi for Welding Metallurgy.

12.32 is the correct answer to “In an arc welding experiment, the current, voltage and electrode travel speed were 140 A, 22 V, and 15 cm/min respectively. The heat input per unit length of the weld is given by . . . . . . . . kJ/cm.”. This question is standard in competitive examination syllabi for Welding Metallurgy.

P-3, Q-2, R-4, S-1 is the correct answer to “Match the welding process in Group 1 with the source of heat in Group 2 . Group 1 Group 2 P. Ultrasonic welding 1. Thermochemical Q. Spot welding 2. Electrical resistance R. SMAW 3. Friction S. Thermit welding 4. Electric arc”. This question is standard in competitive examination syllabi for Welding Metallurgy.

Capillary infiltration is the correct answer to “In brazing process, the liquid metal fills the gap by which one of the following means”. This question is standard in competitive examination syllabi for Welding Metallurgy.

P-4, Q-3, R-5, S-1 is the correct answer to “Match the following: Process Characteristics P. Ultarasonic welding 1. Most commonly used process Q. Plasma arc welding 2. Use of explosives R. Thermit welding 3. Highest temperature S. Shielded metal arc welding 4. Solid state process 5. Use of chemical energy”. This question is standard in competitive examination syllabi for Welding Metallurgy.

Electroslag welding is the correct answer to “Which of the following is not a solid state metal joining technique”. This question is standard in competitive examination syllabi for Welding Metallurgy.

P-3, Q-1, R-4, S-2 is the correct answer to “Match the following: Group 1 Group 2 P. Thermit welding 1. Globular metal transfer Q. Arc welding 2. Mechanical energy converted to heat energy R. Welding in solid state 3. Exothermic process S. Friction welding 4. Diffusion bonding”. This question is standard in competitive examination syllabi for Welding Metallurgy.

0.4 is the correct answer to “Which one of the following carbon equivalent in steel is considered good for weldability”. This question is standard in competitive examination syllabi for Welding Metallurgy.

P-4, Q-3, R-2, S-1 is the correct answer to “Match the welding processes in Group 1 with the principal mechanism in Group 2 . Group 1 Group 2 P. Seam welding 1. Ionisation and plasma Q. Explosive welding 2. Exothermic reaction R. Gas welding 3. Interfacial deformation S. TIG welding 4. Interfacial resistance heating 5. Interfacial diffusion of atoms”. This question is standard in competitive examination syllabi for Welding Metallurgy.

melts below the melting point of base metals is the correct answer to “Brazing fillermetal used for joining steel plates”. This question is standard in competitive examination syllabi for Welding Metallurgy.

type of coating is the correct answer to “Melting rate of electrodes in manual metal arc welding (MMAW) process is mainly governed by the”. This question is standard in competitive examination syllabi for Welding Metallurgy.

chemical energy is the correct answer to “Thermit welding uses the following energy sources.”. This question is standard in competitive examination syllabi for Welding Metallurgy.

in the middle of HAZ is the correct answer to “The grain size in the heat affected zone (HAZ) of a weld is maximum”. This question is standard in competitive examination syllabi for Welding Metallurgy.

protective agent is the correct answer to “Flux in welding process acts as”. This question is standard in competitive examination syllabi for Welding Metallurgy.

close the surface porosity is the correct answer to “In multipass are welds shot peening is done after each pass to”. This question is standard in competitive examination syllabi for Welding Metallurgy.

TIG welding is the correct answer to “The titanium alloys are welded using the following process.”. This question is standard in competitive examination syllabi for Welding Metallurgy.

400 is the correct answer to “Arc welding is done using current, voltage and welding speed of 200 A, 20 V and 0.01 m/s, respectively. The heat input in KJ per unit length is”. This question is standard in competitive examination syllabi for Welding Metallurgy.

Q ⟶ P ⟶ R is the correct answer to “The order of decreasing weldability among the following steel is P. Fe-0.6% C Q. Fe 0.4% C R. HSLA”. This question is standard in competitive examination syllabi for Welding Metallurgy.

P, S is the correct answer to “For better resistance welding, the metal must have P. high electrical resistivity and low melting point Q. high thermal conductivity R. high electrical resistivity and high melting point S. low thermal conductivity”. This question is standard in competitive examination syllabi for Welding Metallurgy.

combination of two separate linear profiles in copper and iron is the correct answer to “Two sheets of iron and copper of equal thickness are welded together into one sheet. Iron is in contact with water at 298 K and copper is in contact with steam at 373 K. At steady state, the temperature profile within the sheet will be”. This question is standard in competitive examination syllabi for Welding Metallurgy.