WELDING

Which type of filler rod is used in gas welding of stainless steel? Pure aluminium Copper silver alloy Columbium stainless steel Copper coated mild steel

Name the gas welding defect.

Porosity Lack of fusion Oxidised weld Incomplete penetration

What will cause if the nozzle touches the molten pool? Spark Smoke Back fire Flash back

Name the joint in the arc welding.

Flush corner joint Single fillet lap joint Half open corner joint Full open corner joint

What is the function of AC welding transformer? It converts to low voltage and high current ampere It converts to high voltage and low current ampere It converts to low voltage and low current ampere It converts to high voltage and high current ampere

What is the disadvantage of AC welding transformer? More initial cost Not free from arc blow More maintenance cost Not suitable for welding non ferrous metal

Which arc welding machine can be used anywhere in the field work even away from electric lines? Rectifier set Motor generator set Engine generator set AC welding transformer

Which arc welding machine provides better heat distribution in the electrode and job? Rectifier set Motor generator set Welding transformer Engine generator set

What is the colour painted on the acetylene gas cylinders? Black Green Blue Maroon

What is the angle to be maintained in the blow pipe and filler rod in the leftward welding technique? 60° & 30° 50° & 40° 30° & 50° 60° & 40°

Which factor determine the current setting during welding? Types of joint Position of weld Length of electrode Diameter of electrode

What is the OCV for welding in step-down transformer which reduces the main supply voltage (220 or 440 volts)? 40 and 100 volt 50 and 100 volt 30 and 20 volt 20 and 25 volt

Which is the welding machine designed to supply both A.C and D.C current for welding ferrous and non-ferrous metals using all types of electrode? Rectifier set Transformer set Motor generator set Engine generator set

What is the name of distortion occurs in the weld direction? Angular distortion Bending distortion Longitudinal distortion Transverse distortion

What is the name of the the metal edge in an angle during welding and cutting operations? Kerf Drag Bevel Gouging

Identify the welding defect shown in figure.

Undercut Cracking Lack of fusion Incomplete penetration

Why the cylinder keys are not removed from the cylinder while welding? To prevent gas leak To adjust the gas supply To open and close frequently To close quickly in case of fire

Which process blow out the cylinder valve socket before connecting the regulator? Cracking Back fire Flash back Pressure testing

What is the oxygen cylinder colour? Red Blue Black Maroon

What is the name of PPE?

Portable screen Chipping goggles Welding hand screen Welding helmet screen

What is the purpose of cellulosic electrode in arc welding process? Very easy to remove the deposited slag Used for high strength steel It is used for low carbon steel It is suitable for all position

What is the storing capacity of oxygen cylinder? 7 m3 10 m3 14 m3 15 m3

What is the equipment used to protect the body from flying spark during gas cutting? Leather cap Leather apron Leather shoes Cutting goggles

How to extinguish the flame after use in gas welding? Shut off oxygen and dip blow pipe in water Shut off oxygen and acetylene valve at a time Shut off oxygen valve first next acetylene valve Shut off acetylene valve first next oxygen valve

Why humming sound effects during arc welding? Long arc length Speedy welding Short arc welding Normal arc length

Which internal defect in welding is invisible to naked eye? Spatter Porosity Undercut Stray arc