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WELDABILITY OF STEEL

What is the current range required for 3.15 mm dia MS electrode in arc welding? 40 - 50A 50 - 60A 70 - 80 A 100 - 110 A

What is the name of the last bit of a discarded electrode? Red end Dead end Stub end Waste end

How many groups of mild steel pipes are there? Two groups Five groups Four groups Three groups

How is a pipe specified? Dia only Length only Outer dia only Outer dia x inner dia x length

What should be the bevel angle for edge preparation of 6 mm thick pipe welding? 30° - 35° 40° - 45° 60° - 65° 70° - 75°

What is the purpose of copper coating on mild steel filler rods used in gas welding? Rust proof Water proof Moisture proof Increased filler dia

What is the defect in the weld joint shown in figure?

Overlap Porosity Reinforcement Lack of penetration

Which metal in the welding process is subjected to the “Weld decay" defect? Brass Copper Mild steel Stainless steel

Which filler rod is used for bronze welding of cast iron, malleable iron and copper? Manganese, Bronze, filler rod Copper, Phosphorus, filler rod Copper, Phosphorus alloy filler rod Copper, Zinc, Nickel filler rod

What does the third digit of AWS codification in EB 5426HJX represent? Type of current Type of covering Type of tensile strength Type of welding position

Which accessory is used to protect the eyes during gas welding? Helmet Hand screen Colour goggles Grinding goggles

What is the composition of acetylene gas? C-72.3% H - 27.7% C-82.3% H - 17.7% C-90% H - 10% C-92.3% H-7.7%

What is the name of the flame shown in the figure?

Neutral flame Oxidising flame Carburising flame Oxy-Acetylene flame

Which size of CCMS filler rod is to be used for a welding plate of 8 mm thick with 'V' edge preparation? 3.15 mm ø 4.0 mm ø 5.0 mm ø 6.3 mm ø

How many segments are to be selected for welding 50 mm J pipe? 3 segments 4 segments 6 segments 8 segments

What type of edge preparation is needed, for gas welding a pipe, with wall thickness 6 mm? Single "V" Single bevel Square edge with root gap Square edge without root gap

How many equal divisions should be made while developing a "T" pipe joint? 4 equal divisions 6 equal divisions 9 equal divisions 12 equal divisions

What is the name of small metal particles which are thrown out of the arc during welding? Slag Spatters Stub end Weld metal

How is the construction of a nozzle for gouging identified? Straight nozzle with single preheating hole Bent nozzle with sectorial preheating holes Fully bent nozzle with circular preheating holes Slightly bent nozzle with circular preheating six holes

What is the bevel angle for pipe welding butt joints if wall thickness is more than 5 mm? 60° 75° 80° 90°

Which type of stainless steel is weldable? Nickel type Ferrite type Stabilised type Chromium type

What is the preheating temperature of cast iron? 200 to 310°C 250 to 350°C 300 to 350°C 350 to 450°C

What is the root run? Backing run The first run is root run The third run is root run The second run is root run

What do you call the non - coated electrodes? Raw electrode Bare electrode Base electrode Deep penetration electrode

How is the electrode size identified? Length of electrode Thickness of flux coated Diameter (over all) of electrode Diameter of inner core wire

What are the standard electrode lengths available? 250 mm and 350 mm 350 mm and 450 mm 400 mm and 500 mm 500 mm and 600 mm

What is the grade of hacksaw blades with pitch 0.8mm? Fine Medium Course Rough

What does the letter 'x' indicate in the electrode classification of EB5426 H1JX? Covered electrode Increase metal recovery Hydrogen controlled electrode Radio graphic quality electrode

What is the percentage of carbon in medium carbon steel? 0.05% to 0.30% 0.05% to 0.8% 0.30% to 0.6% 0.6% to 1.2%

What is the defect of metal flowing into the surface of base metal without fusing it? Over lap Under cut Lack of fusion Lack of penetration

What is the type of welding defect shown in given figure?

Crack Blow hole Burn through Unfilled crater

Which one of the defects is caused by low current in arc welding? Porosity Under cut Lack of fusion Excessive penetration

What is the cause of hair line separation in the bead in arc welding? Fast cooling Slow cooling Long arc length Wrong selection of electrode

What is the name of the steel material which is not weldable? High carbon steel Medium carbon steel Austenitic stainless steel Ferrite & martensitic stainless steel

Which is used to cut thin pipes of smaller sizes? Chisel Hack sawing Pipe cutter Lathe parting tool

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

Which type of filler rod shall contain a higher percentage of iron? Ferrous Non-ferrous Alloy type of ferrous metals Alloy type of non - ferrous metals

What is the process of heating steel to a specific temperature and cooling suddenly? Annealing Hardening Tempering Quenching

What is the main purpose of ‘Normalising' steel? To control hardness To prevent cracking To make welding operation easier To produce fine grain of uniform structure

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