Prepare for your examinations with a set of multiple choice questions (MCQs) related to Gas-Metal Arc Welding 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.

Gas Metal Arc Welding

Which type of core wire is suitable for welding carbon steel, alloy steel and stainless steel under FCAW? Flux cored electrode Gas shield flux wire Used flux core and gas shielded Flux is external and shielded

What are the distinct differences between GMAW and FCAW equipment? Nozzle and torch Construction of torch and feed rollers Machine and torch Feed rolls and gas cylinders

What is the name of the metal transfer system in FCAW? Dip transfer Free flight transfer Globulor transfer Purged transfer

Why is the argon and CO2 mixture used in FCAW? Smooth spray transfer, with minimum slag Smooth globular transfer Smooth pulsed transfer Smooth dip transfer

Why are different types of pressure rollers used in FCAW? Knurled rollers Without roller of travel wire With pressure of tubular wire Positive feeding without pressure on tubular wire

Which type of welding under FCAW, is more suitable for welding all types of steel? Only use flux cored electrode Only use gas shielding flux Flux is external and also gas also external None of the above

What type of hand tool is used to open a gas cylinder in welding practice? X key Allen key DE spanner Spindle key

Why should the welder's cloth be free from oil, grease etc, while welding? To protect the job To deflect the arc rays To avoid catching fire To safeguard your inner cloth

Which electrode wire is more suitable for carbon steel fabrication in the GMAW process? 70S - 6 70T - 2 70S - 2 70S - 3

Which metal transfer process in GMAW produces strong weld with least spatter? Spray transfer Globular transfer Dip transfer Pulsed transfer

Why the argon and CO2 mixing gas used in FCAW? Smooth spray transfer of melt Smooth globular transfer Smooth pulsed transfer Smooth dip transfer

How the preheating temperature is checked before welding wrought iron or cast metals? Flow of spatters Size of blow holes Temperature indicating crayon Count of pin holes

Which is the operation to relieve residual stresses from the welding joint? Pre-heating Peening Drilling Post heating

Which is the only welding position in the electro slag welding process? Down hand Horizontal Vertical Over head

Why are carbon and manganese added to plain thermit mixture on rail welding? To get good fusion To get hardness To get fine welding To get smooth finishing

What type of weld is used on prepared holes of overlap joints? Tack weld Fillet weld Backing weld Plug or slot weld

Which is the pipe joint for given pipe development?

Y joint 90° T joint 60° branch joint 50° branch joint

Which is the weld position of GMA welding if the filler metal is deposited from the upper side of the joint during welding? Vertical position Horizontal position Over head position Down hand position

What is the type of weld position in which the weld metal is deposited under the side of the joint? Down hand position Horizontal position Vertical position Overhead position

What is the usual torch angle tilt on either side of the vertical in GMAW? 10° - 20° 20° - 25° 25° - 30° 30° - 35°

What is the electrode inclination to the metal surface in T-joint welding of 10 mm thickness metal by down hand position? 30° 45° 60° 75°

What is the usual length of tack weld in a T joint in GMAW flat position welding? 5 mm 10 mm 15 mm 20 mm

What is the purpose of fitting clear glasses on either side of coloured glass in a helmet? Protect from rays Protect from heat Protect from spatters Protect from radiation

How does the welder observe the welding area of the joint in electron beam welding? Safe optical mirror Safe optical helmet Safe optical hand screen having correct shade Safe optical viewing system containing optical mirror

How to protect from the toxic fumes during welding operation? Wear helmet Use hand screen Use leather apron Use respirator pad

What is the purpose of using copper coated filler wire in MIG / MAG welding? To prevent rust To prevent atmosphere To prevent base metal reaction None of the above

What is the angle of inclination of the weld torch for flat position in the GMAW welding process? 5° - 10° 10° - 15° 15° - 25° 25° - 35°

How many Kgs weight of thermit is required against one Kg of wax? 10 to 15 Kgs 11 to 15 Kgs 12 to 14 Kgs 12 to 16 Kgs

Which is adjusted in electron beam welding to eliminate the defect of porosity? Spot size Deflection Weld penetration Focal position / focus current

What is the limitation for the submerged arc welding process? Limited to vertical position Limited to non ferrous metals Limited to over head position Limited to flat and horizontal fillet welds

What ampere range required for setting 1.2 mm filler wire for welding mild steel in MIG/MAG welding? 50 - 100 Amps 70 - 120 Amps 90 - 150 Amps 100 - 225 Amps

Which combination of shield gas in the GMAW process produces good arc stability for carbon steel? Argon + 20% CO2 CO2 Pure argon Argon + 5% CO2

How is the filler wire fed in the GMAW welding process? Manually No feeding Automatically Semi automatic

Which type of electrodes are used in MAG/CO2 welding? Flux coated electrodes Bare wire electrode Flux cored electrodes Tungsten electrode

What is the range of electrodes for MAG/ CO2 welding? 0.8 to 1.6 mm 0.7 to 1.3 mm 0.6 to 0.9 mm 0.5 to 0.7 mm

What type of operation is generally used in GMAW? Automatic Semi automatic Fully automatic Manual method

Which heat treatment of steel increases hardness, but decreases strength and ductility? Annealing Hardening Normalising Case hardening

Which heat treatment process produces only outer surfaces of job hardened, to some depth? Annealing Hardening Normalising Case hardening

Which heat treatment process is employed to remove brittleness in a chisel? Annealing Hardening Tempering Normalising

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