Prepare for your examinations with a set of multiple choice questions (MCQs) related to Weld-Ability of steel 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.

WELD-ABILITY OF STEEL

Which system of welding is free from “Arc blow"? AC welding DC Reverse polarity DC straight polarity Welding with long arc

What is the effect of expansion and contraction due to heat in welding? Peening Arc blow Distortion Metal force

Which one of the following methods of welding is not a method used to control distortion? Skip welding Back step welding Right hand welding Intermittent welding

What is the rule for deciding the length of intermediate tacks? 3 to 4 times plate thickness 2 to 3 times plate thickness 5 times the plate thickness 50 mm irrespective of plate thickness

Which type of cast iron offers greater resistance to shock? Grey cast iron White cast iron Nodular cast iron Malleable cast iron

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

What is the angle of the pipe axis with the base for making an elbow joint? 30° 45° 75° 90°

What method is followed to make a circular gas cutting? Using hand as a guide Using a guide clamp fitted to torch body Step by step cutting circular segments Manual rotation on the circumference of the circle

Why is the deposited bead not in uniform size? Incorrect flame setting Wrong angle of blow pipe Wrong angle of filler rod Variation in speed of travel and angle

Which element is present in contact electrodes in large proportion? Carbon Silicon Manganese Iron powder

Which size of filler rod should be used to weld 2.5 mm thick plates,using nozzle 5 by leftward technique? 1.60 mm 2.00 mm 2.50 mm 3.15 mm

Which process causes the increase in the strength of part after fabrication? Hardening Tempering Quenching Normalising

How the repairs of cracks in the cast iron component carried out? By using clamps during welding process Similar to arc welding mild steel plate Local preheating, leftward welding technique flame heating each layer Cracks repaired using appropriate electrode

Which heat treatment process causes the reduction of brittleness in the steel? By annealing By hardening By tempering By normalising

What is the cause of porosity in arc welding? Damp electrodes Carbon electrodes Over size electrodes Low hydrogen electrodes

What is the welding defect in base metal that gets melted and a groove formed along the toe of the weld? Undercut Blow holes Reinforcement Lack of penetration

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

What is the defect due to non cleaning the surfaces before welding? Over lap Lack of fusion Surface porosity Small cracks in bead

What is the reason for lack of fluidity in molten metal in braze welding? Over heating Improper flame Inadequate preheating Improper cleaning and less use of flux

What is the reason for the defect of more spatter during arc welding? Insufficient root gap Welding current too high Wrong angle of electrode 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? Porosity Under cut Lack of fusion Lack of penetration

What is the defect shown in the figure?

Over lap Porosity Under cut Lack of penetration

What is the result of the inner cone of flame touching the molten metal while welding? Cause to overlap Cause to back fire Cause to porosity Cause to flame snape out

What defect will occur due to incorrect tilt of the blow pipe? Crater at end Weld porosity Lack of root penetration Under cut in weld joints

How is the scale and oxide removed from stainless steel weld? Peening Cooling in oil Cooling in sand Heating up to 9500 to 11000̊C and quenched in water

What makes for the buckling of a weld joint, in stainless steel during cooling? Over heated zone Low thermal conductivity Chromium contamination High thermal conductivity

What is the name of a short weld made prior to the welding to hold the plates in perfect alignment? Bead weld Tack weld String bead Strong

What is the type of distortion shown?

Length distortion Angular distortion Transverse distortion Longitudinal distortion

What type of defect will occur due to evaporation of the trapped gas from the liquid metal? Arc blow Porosity Over lap Crack

Which welding slag inclusion defect will occur? Manual metal arc welding Tungsten invert gas welding Metallic inert gas welding Oxy - acetylene gas welding

What will happen if the current is low while arc welding? Formed over lap Spatter are more Electrode fused speedly Base metal edges not melt properly

What is the use of intermediate tacks on a weld setting of plates? To reduce the welding run To control defects in weld joint To speed up the welding joint Align and to maintain the position of joint

What is the main reason that aluminium is difficult to weld? Less weight Oxide formation High thermal conductivity Better strength weight ratio

When does the defect of gouging on the cutting face take place? Too much pre-heating| Too slow cutting speed Excessive speed, inadequate pre-heating Too much cutting oxygen pressure

What method of heating is done to remove bending distortion of a weld joint with a wedge shaped area? Spot heating Pipe - needle heating Triangular heating Checker - board heating

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