Which process causes the increase in the strength of part after fabrication?
A. Hardening
B. Tempering
C. Quenching
D. Normalising
How the repairs of cracks in cast iron component carried out?
A. By using clamps during welding process
B. Similar to arc welding mild steel plate
C. Local preheating, leftward welding technique flame heating each layer
D. Cracks repaired using appropriate electrode
Which heat treatment process causes the reduction of brittleness in the steel?
A. By annealing
B. By hardening
C. By tempering
D. By normalising
What is the cause of porosity in arc welding?
A. Damp electrodes
B. Carbon electrodes
C. Over size electrodes
D. Low hydrogen electrodes
What is the welding defect in base metal gets melted and a groove formed along the toe of the weld?
A. Undercut
B. Blow holes
C. Reinforcement
D. Lack of penetration
What is the name of the steel material that is not weldable?
A. High carbon steel
B. Medium carbon steel
C. Austenitic stainless steel
D. Ferrite & martensitic stainless steel
What is the defect due to non cleaning the surfaces before welding?
A. Over lap
B. Lack of fusion
C. Surface porosity
D. Small cracks in bead
What is the reason for lack of fluidity in molten metal in braze welding?
A. Over heating
B. Improper flame
C. Inadequate preheating
D. Improper cleaning and less use of flux
What is the reason for the defect of more spatter during arc welding?
A. Insufficient root gap
B. Welding current too high
C. Wrong angle of electrode
D. Use of a very short arc length
What is the welding defect, with no fusion of base metal on root face, side face or between the weld run?
A. Porosity
B. Under cut
C. Lack of fusion
D. Lack of penetration
What is the result of inner cone of flame touching the molten metal while welding?
A. Cause to over lap
B. Cause to back fire
C. Cause to porosity
D. Cause to flame shape out
What defect will occur due to incorrect tilt of blow pipe?
A. Crater at end
B. Weld porosity
C. Lack of root penetration
D. Under cut in weld joints
How is the scale and oxide removed from stainless steel weld?
A. Peening
B. Cooling in oil
C. Cooling in sand
D. Heating up to 950° to 1100°C and quenched in water
What makes for the buckling of weld joint, in stainless steel during cooling?
A. Over heated zone
B. Low thermal conductivity
C. Chromium contamination
D. High thermal conductivity
What is the name of short weld made prior to the welding to hold the plates in perfect alignment?
A. Bead weld
B. Tack weld
C. String bead
D. Strong weld
What type of defect will occur due to evaporation of the trapped gas from the liquid metal?
A. Arc blow
B. Porosity
C. Over lap
D. Crack
Which welding the slag inclusion defect will occur?
A. Manual metal arc welding
B. Tungsten invert gas welding
C. Metallic invert gas welding
D. Oxy – acetylene gas welding
What will happen if the current is low while arc welding?
A. Formed over lap
B. Spatters are more
C. Electrode fused speedly
D. Base metal edges not melt properly
What is the use of intermediate tacks on a weld setting of plates?
A. To reduce the welding run
B. To control defects in weld joint
C. To speed up the welding joint
D. Align and to maintain the position of joint
What is the main reason, that aluminium is difficult to weld?
A. Less weight
B. Oxide formation
C. High thermal conductivity
D. Better strength weight ratio