This document discusses axially loaded unsymmetrical welded joints and their applications. It presents on the topic by four students and is guided by Prof. R.R. Barshikar. It introduces welding and types of welded joints such as butt and lap joints. It then examines unsymmetrical welded joints where sections like angles are welded to plates or beams under axial loading. It analyzes how to proportion the weld lengths to achieve equilibrium. The document outlines advantages of welded joints like strength and ease of alterations, and disadvantages like need for skilled labor and potential for distortion. It lists references used in the presentation.

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Title :- Axially Loaded Unsymmetrical Welded
Joint and It’s Applications.
Presented By Roll No.
 Adnan Baig 29
 Musab jaleel 30
 Rakesh Patil 31
 Pankaj Patil 32
Guided By :- Prof. R.R.Barshikar

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Topics :-
 Introduction To Welding
 Types of Welded joint
 Axially loaded unsymmetrical welded joints
 Advantages And Disadvantages
 References

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Bhujbal Knowledge City
MET Institute of Engineering
Types Of Welded Joints :-
The two important types of welded joints
are:-
 1. Butt weld
Types of butt welds are
A) Single V butt joint
B) Double V butt joint
C) Single U butt joint
D) Double U butt joint
2. Lap (Fillet joint)

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In certain application, unsymmetrical section such as angle, channels, T-sectionIn certain application, unsymmetrical section such as angle, channels, T-section
etc., are welded to the steel plates or the beam are loaded axially. Fig (a) shows anetc., are welded to the steel plates or the beam are loaded axially. Fig (a) shows an
angle section welded to a vertical beam by means of two parallel fillet welds 1 andangle section welded to a vertical beam by means of two parallel fillet welds 1 and
2. C.G. is the centre of gravity of the angle section. The external forces acting on2. C.G. is the centre of gravity of the angle section. The external forces acting on
the joints passes through C.G. Suppose P1 and P2 are the resisting forces set up inthe joints passes through C.G. Suppose P1 and P2 are the resisting forces set up in
the welds 1 and 2 respectively. In such cases, the lengths of weld should bethe welds 1 and 2 respectively. In such cases, the lengths of weld should be
proportioned in such a way that the sum of resisting moments of the welds aboutproportioned in such a way that the sum of resisting moments of the welds about
the gravity axis is zero.the gravity axis is zero.
Axially Loaded Unsymmetrical Welded
Joint :-

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Fig. (a)

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Consider an unsymmetrical section (angle)
welded on flange edges subjected to an axial
loading
 Let la = length of the weld at the top
 lb = length of weld at the bottom
 L= total length of weld= la+lb
 P= Axial load
 a= Distance of the top weld from an axis
Analysis Of Unsymmetrical Welded Which Are Axially
Loaded :-

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Passing through the CG of the angle (known
as the gravity axis)
 b= Distance of the bottom weld from gravity
axis.
 f= Resistance offered by the weld per unit
length.
 Resistance offered by top weld= f x la

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Moment of the resistance offered by top
weld about the gravity axis= f x la x a
 Similarly the moment of resistance offered
by the bottom weld about the gravity axis= f
x lb x b
 For equilibrium, sum of these moments
should be zero.
 Hence f x la x a= f x lb x b
 => la x a= lb x b; l= la + lb
 Hence la= l x b / (a+ b) and lb = l x a/(a + b)

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Advantages :-
1) Comparatively lighter than riveted
structures
2) Greater strength compared to riveted
joints
3) Addition and alterations can be done
easily
4) Better finish than riveted joints. Hence
maintenance costs & painting costs are less
5) Lesser time consuming
6) Tension members are not weakened in
welded joints compared to riveted joints

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Disadvantages :-
1) Requires skilled labour
2) Possibility of additional stress
development due to uneven heating and
cooling. Or in other words, the members may
get distorted
3) Testing is difficult.
4) As there is no provision for expansion or
contraction of joints, cracks may develop
and propogate

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Reference :-
 V.B.Bhandari
R.S.Khurmi

12. Bhujbal Knowledge City
MET Institute of Engineering