Prepare for your examinations with a set of multiple choice questions (MCQs) related to Weldability of Steels for Welder Trade. The questions are likely designed to test a user’s knowledge or understanding of Mechanic Diesel concepts and may be useful for exam preparation or self-assessment. The website may be a helpful resource for individuals studying to become Welder or seeking to improve their understanding of Welder principles.

WELDABILITY OF STEELS

What is the purpose of setting the root gap? To over some under cut To control distortion To get good penetration Gap get closed due to expansion

Which of the following metals have high thermal conductivity? Brass Bronze Copper Aluminium

What is the process of hot weld joints rapidly hammered to relieve internal stresses? Peening Annealing Heat treatment Straightening

Which type of cast iron possesses higher hardness? Grey cast iron White cast iron Nodular cast iron Malleable cast iron

Which type of cast iron is soft? Grey cast iron White cast iron Nodular cast iron Malleable cast iron

Which size of filler rod should be used to weld 2 mm thick MS sheets? 1.6 mm 2.0 mm 2.5 mm 3.15 mm

What is the main function of the flux coating in electrodes? To prevent rusting To stabilize the arc To control arc temperature To increase welding current

What is the purpose of an oxygen lever in gas cutting? Pre heat the base metal Push the molten metal Remove the excess metal Release excess oxygen and to push the molten metal

Which gouging nozzle is selected for rivet head cutting? Bent nozzle with three pre-heating holes Straight nozzle with six pre-heating holes Bent nozzle with six holes Flute cutting straight with six holes

What is the name of the part 'x' shown on a portable cutting machine?

Speed control Per-heat control Vertical control Horizontal control

What benefit do we get out of a carburising flame? Suitable for brass, copper welding Suitable for stellite, flame cleaning Suitable for mild steel, stainless steel Suitable for pure aluminum, cast iron & brass welding

What are the defects in generated acetylene gas? Oxygen, hydrogen & carbon Carbon monoxide unburnt ash Hydrogen, dust particles, ash Hydrogen, lime dust, ammonia & water vapour

What is the range of pressure used in an oxygen cylinder used in gas welding? 120 to 150 Kg/cm2 110 to 150 Kg/cm2 100 to 150 Kg/cm2 90 to 150 Kg/cm2

What should be the angle of the filler rod, by rightward welding? 30° - 40° 40° - 50° 50° - 60° 60° - 70°

What thickness of plate, gas welding by forehand technique can be used without edge preparation? Up to 2.5 mm Up to 3.15 mm Up to 4 mm Up to 5 mm

What flux is used in welding brass? Anti - borax Borax paste Cryolite and barium chloride Zinc chloride and potassium dichromate

What flux is to be used for gas welding stainless steel plates? Borax flux Anti - Borax Cryolite and barium chloride Zinc chloride and potassium dichromate paste

Which filler rod to be used for gas welding aluminum? Silicon - brass Silicon - manganese Copper - Silver alloy Pure aluminum, 5% silicon aluminum alloy

What should be the preheating temperature of an aluminum job for gas welding? 200°C - 400°C 250°C - 400°C 300°C - 400°C 350°C - 400°C

What is the base for selecting the nozzle size for gas welding of a pipe? Groove angle Welding position Diameter of pipe Pipe wall thickness

What is the welding position as per ASME for a pipe joint held vertically, welding in a horizontal line? 1G 2G 5G 6G

What procedure is followed in a welding pipe in a 5G position? Rotate pipe and weld vertically Pipe not rotated weld vertically Pipe not rotated and pipe axis 45° Pipe welded 12 o'clock to 6 o'clock downhill

What size of CCMS filler rod is used for finish run of 50 mm pipe root welded using 1.65 filler? Φ 1.6 mm Φ 3.0 mm Φ 3.5 mm Φ 4.0 mm

What size of electrode is used to weld a 5 mm wall thickness pipe? Φ 2.5 mm Φ 3.15 mm Φ 4.00 mm Φ 5.00 mm

Which test indicates the hardness of a metal? Brinell test Tensile test Charpy izod test Ultrasonic inspection

What type of preheating is done only at the portions to be welded? Full preheating Local preheating Direct preheating Indirect preheating

Which type of polarity is used in welding non ferrous metals? AC Transformer Reverse polarity Straight polarity DC Motor generator

Which type of arc does not have control on the molten pool? Long arc length Short arc length Normal arc length Too short arc length

Which of the following produces an unstable arc? Long arc length Short arc length Normal arc length Too long arc length

Which type of arc length produces poor penetration? Long arc length Short arc length Normal arc length Too long arc length

What are the four clock positions in pipe welding? 6, 12, 3, 9' o clock points 11, 5, 8, 2' o clock points 10, 4, 1, 7 'o clock points 9, 3, 12, 6' o clock points

What is the 6 o'clock position in CW pipe welding refers to in 5G position? Down hand position Horizontal position Over head position Vertical up hill position

What procedure is to be followed for welding pipes under 6G position? Pipe not rotated and deposit weld vertical Rotate pipe and deposit weld vertical Pipe not rotated and deposit weld horizontal Pipe not rotated and pipe axis 45° angle deposit weld flat, vertical

Which element filler rod is used to weld stainless steel plates? Osmium Punodium Argentinum Molybdenum, columbian

Which are the common alloying elements of brass? Copper and tin Bismuth and tin Antimony and tin Copper & zinc

Which of the following aluminum alloys consists of 1% iron & silicon? Duralumin Wrought iron Aluminum cast alloy Commercially pure aluminum

What is the purpose of cleaning sheets before doing gas welding? To avoid over lap To avoid porosity To avoid under cut To Control distortion

Which type welding uses a non - ferrous filler with melting point above 45°, than base metal? Brazing Soldering Arc welding Gas welding

Which welding process enables us to weld dissimilar metals? Brazing Seam welding Spot welding Fusion welding

What type of gas flame is used to weld 2 mm mild steel by brazing method? Neutral flame Carburising flame Oxidising flame Oxy-hydrogen flame

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