Strength of Transverse Fillet Weld – Design of Welded Joints – Design of Machine


Hello Friends here in this video we will see what is meant by Strength of Transverse Fillet Weld in this here I would be deriving a formula of strength strength means load carrying capacity for a transverse fill it well but for that purpose I have to draw a diagram so let us get started Here I am having two plates one is the upper plate and other is the lower plate now these two plates they are connected with the help of a welded joint here this indicates the joint that it is welded now when these two blades are connected there will be force acting on the upper plate next force acting on the lower plate because of the action of these two forces this joint it can break now for this joint we need to know that how much value of load this joint can resist and that is nothing but the strength of transverse fill it will for this fill it way we should know how much is the load carrying capacity so what we can do here is I’ll assume that this thickness of the plate is s and similarly upper plate will also have the same thickness so here I will say that first of all let s be the thickness of plate in mm next after this I’ll say that L be the length of weld this will also be in mm now this joint which we are saying which is the welded joint I can simplify this that is here it is having a diagram like this now what we can do here is join these two points so that we get a right angle triangle and here I will call it as triangle ABC this extra portion is nothing but it is called as re-enforcement this is a reinforcement which is provided for added strength so when we are analyzing the transverse fill it well we need to know that year there is a right angle triangle now this triangle has two sides one is a B next is BC both of them are of same height that is s which we can call it as the plate thickness now from B I will draw a perpendicular line on this hypotenuse AC this hypotenuse where it meets diapered aeneas this perpendicular I will call it as M next angle B a.m. that will be equal to 45 degree now this distance BM is called as throat thickness I will write down BM it is called as throat thickness and throat thickness is the minimum thickness I will write down that it is minimum thickness in the world so when we have this minimum thickness and this thickness would be carrying on up to the entire length length of weld is L so I will be getting an area now this is the area on which welding is done where I will see that this is T throat thickness and here we have length of weld so this is the minimum area now remember that either we talk about welded joint or we’ll talk about any object it will always fail at the minimum area in a welded joint minimum area will be at the throat because at throat the thickness is minimum so therefore minimum area at the throat that will be a is equal to T into L now how to get T here if we can see in this triangle a MB which I can draw it here in an enlarged way this is a MB now this BM indicates the throat thickness T a B indicates the thickness of plate which is s this angle is 45 degree so from this I can say that since sine 45 degree is equal to opposite upon hypotenuse opposite is T iPod anuses s so therefore T is equal to sine 45 into s so finally t will be sine 45 is point seven zero seven into s so we can put this value of T to get the minimum area so I will say that therefore minimum area of weld capital A that will be equal to t which is 0.7 0.7 0 7 s multiplied by the length of weld L now after getting this minimum area I can say that therefore the tensile strength because transverse fill it when it is subjected to tensile load so tensile strength of transverse fill it weld it will be given by P is equal to area multiplied by tensile stress so therefore P will be equal to area is 0.7 0 7 s multiplied by L into Sigma T this I will keep it as equation number 1 now your I will say that in equation number 1 equation 1 gives the strength or load carrying capacity of single transverse fill it weld now suppose we have another fill it will at the bottom like I can mark it here that here there is another fill it well so I’ll say that after this for double transpose fill it wait area will be twice of throat thickness multiplied by L that is a previous area which we were getting as T into L here since we will be using to fill it transverse fill it well so area is 2 into T into L so this will be 2 into T is 0.7 0 7 s multiplied by L so hence area will be 1 point 4 1 4 s into L this is the area which we will get for double transverse fill it will after this we can say that there for strength or load carrying capacity of double transfers fill it weld that load carrying capacity will be denoted by P and again this will be Sigma T into a that is tensile stress into area because transverse phillyd field they are subjected to tensile load so therefore P is equal to area first I will write down one point four one four into s multiplied by L into Sigma T this I will keep it as equation number two so therefore from equation number two strength of double transverse fill it well can be found out so you’re in this video we have seen how to know calculate or how to derive the formula of strength of transverse fill it way we had started it from a diagram we had seen what is meant by throat thickness which is the minimum thickness then minimum area which is throat thickness into L so after getting this area we had even converted the value of T in the form of s so T was 0.7 ZZ 0 7 s with the help of this diagram it was explained then finally we were getting minimum area of well then tensile strength of transverse fill it well which was single so here in equation 1 we were getting the strength equation for load carrying capacity of single transverse fill it will and similarly we had gone on to deriving the area and the formula for double transverse pellet weld so in this video we have seen how to get the strength of transverse fill it went

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