WELDED CONNECTION BOOSTER 14/06/2025

Untitled Lesson

By WINCENTRE CLASSES

Explanation Slide...

Edge/End DistanceDistance from the nearest edge to the centre of first rivet/bolt. Also called marginal pitch

o shear fa

​Tension failure of bolts

When the bolt is Subjected to the pure tension the Fracture of the bolt is observed when the tensile stresses exceed the ultimate tensile strength of the bolt.

Explanation Slide...

Lap Joint – Two plates placed one above other and connected in this overlapButt Joint – Two plates placed end to end and connected by a cover plate

o shear fa

​Tension failure of plates

i.It is also known as Tearing failure of plates.

i.The tension failure of plate occurs when the tensile stress in the plate at the net crosssection exceeds the tensile strength of the plate.

●

ii.Tension failure plane occurs perpendicular to the direction of force

Multiple Choice

A rivet will be in double shear if the joints is

• Double riveted lap joint

• Single cover single rivetted butt joint

• Double cover single revetted butt joint

• Single rivetted lap joint

Multiple Choice

Identify the type of bolted connection

• Double bolted double cover butt joint

• Single bolted double cover butt joint

• Double bolted single cover butt joint

• Single bolted single cover butt joint

Multiple Choice

In a double-riveted double-covered butt

joint, the strength of the joint per length in

shearing the rivets is n times the shear

strength of one rivet in single shear, where

'n' is equal to

• 1

• 2

• 3

• 4

Multiple Choice

What is the ratio of the yield stress in power driven shop rivets relative to the permissible bearing stress of mild steel? 

• 1.0

• 0.8

• 0.6

• 0.4

Multiple Choice

Ribbed bolts are also known as ____.

• Turned bolt

• Fluted bolt

• Unfinished bolt

• Interference bolt

Explanation Slide...

Multiple Choice

The designation M 33 × 2 of a bolt means

• metric threads of 33 nos is 2 cm. 

  
  

• metric threads with cross-section of 33 mm3

  
  

• mertic therads of 33 mm outside diameter and 2 mm pitch

  
  

• 
  bolt of 33 mm nominal diameter having  threads per cm 

  
  

Multiple Choice

The shear capacity of bolts is reduced

1. 1. When total thickness of connected plates exceeds 5 times the nominal diameter of bolts.

2. 2. When packing plates are more than 6mm thick

• Both the statements are true

• Statement 1 is true

• Statement 2 is true

• Shear capacity of bolt is evaluated without considering the abov efactors

Multiple Choice

Bolts are more suitable to carry

• Shear

• Bending

• Axial Tension

• Shear and Bending

Multiple Choice

Prying forces are

• 
  Forces due to the friction between connected parts

  
  

• Bending forces on the bolts because of the joints

  
  

• 
  Shearing forces on the bolts because of joints

  
  

• Tensile forces due to the flexibility of connected parts

  
  

Multiple Choice

In which of the following case we avoid bolted connection

• Connection subjected to fire

• Connection subjected to frequent earthquake load

• Connection subjected to snow load

• Connection subjected to corrosion problem

Multiple Choice

What is the maximum number of 20 mm diameter bolts that can be accommodated in a single row on a 140 mm wide flat strip used as one of the structural elements involved in the process?

• 5

• 4

• 3

• 2

Multiple Choice

Butt weld is also known as

• Lap weld

• Fillet weld

• Groove weld

• All of these

Multiple Choice

Calculate the strength of 20 mm Φ bolt having a net tensile stress area = 245 mm2 with a partial safety factor of 1.25 and kb = 0.5 in single shear. Take the grade of bolt as 4.6 and minimum plate thickness is 10mm

• 82 KN

• 68.65 KN

• 45.27 Kn

• 33.89 KN

Multiple Choice

A butt weld is specified by

• Effective Throat Thickness

• 
  plate thickness

  
  

• 
  size of weld

• 
  penetration thickness

  
  

Multiple Choice

The size of a butt weld is specified by the effective throat thickness which in the case of incomplete penetration, is taken as

• 1/2 of the thickness of thicker part

• 1/2 of the thickness of thinner part

• 7/8 of the thickness of thicker part

• 7/8 of the thickness of thinner part

Multiple Choice

The throat in a fillet weld is

• 
  Large side of the triangle of the fillet

• 
  Hypotenuse of the triangle of the fillet

  
  

• Small side of the triangle of the fillet

  
  

• 
  Perpendicular distance from the root to the hypotenus

Multiple Choice

The minimum length of butt weld shall be:

• equal to the thicker plate thickness

• Equal to the thinner plate thickness

• Two times the size of the weld

• Four times the size of weld

Multiple Choice

Weakest section in a fillet weld is

• Throat of the fillet

• 
  Smaller side

• 
  Side parallel to force

• Side perpendicular to force

Multiple Choice

Match List I and List II and select the correct answer using the codes given below the lists:

• A-2, B-4, C-1, D-3

• A-1, B-3, C-2, D-4

• A-4, B-3, C-1, D-2

• A-1, B-4, C-3, D-2

Multiple Choice

For standard 45 degree fillet weld the ratio of size of

fillet to throat thickness is

• 1:1

• 2:1

Multiple Choice

For the fillet weld of size s shown in the adjoining figure, the effective throat thickness is

• 0.61s

• 0.65s

• 0.70s

• 0.75s

Multiple Choice

What will be the Minimum size of fillet weld if the plate thickness is less than 10mm?

• 4mm

• 3mm

• 2mm

• 5mm

Multiple Choice

Maximum size of a fillet weld for a plate of square edge is

• 1.5 mm less than the thickness of the plate

• one half thickness of the plate

• thickness of the plate itself

• 1.5 mm more than the thickness of the plate

Multiple Choice

The effective length of a fillet weld of length L

and size S is given by

• 
  (Total length – 2 × throat size)

  
  

• (Total length – 2 × weld size)

  
  

• 
  (0.7 × Total length)

  
  

Multiple Choice

The effective section of a fillet weld is represented by a triangle as shown below with sides S₁, S₂ and S₃ Such that S₃ > S₂ > S₁. If the allowable shear stress in weld material is τ, the resistance of weld per unit length is 

Multiple Choice

A circular plate 100 mm diameter is welded to another plate by means of 6 mm fillet weld. If the permissible shearing stress in the weld equals 100 N/mm², then the greatest twisting moment that can be resisted by the weld will be

• $$4.242\pi\ kNm$$

• $$3\pi\ kNm$$

• $$2.1\pi\ kNm$$

• $$0.6\pi\ kNm$$