1 Fillet weld deposit Beam Applied Force F CofA of Weld outline Base plate End plate Dr Andrei Lozzi Design II, MECH 3.400 School of Aerospace, Mechanical and Mechatronic Engineering University of Sydney, NSW 2006 Australia Analysis of planar welds lecture weld new b References: Blodget, Design of Weldments, J F Lincoln Foundation Hall et al, Machine Design, McGraw Hill (Schaum) Shigley et al, Mechanical Engineering Design, eds 4 to 7, McGraaw Hill Australian Standard Association AS1554 welding & AS3990 steel structures A quick overview: There are many aspects of welding which ought to be known by engineers, we will begin with a simple method of calculating the width of a fillet weld. That is, how wide should we make a weld once the outline of the weld has been decided on and all the loads transmitted to the weld are known. The creative part here is reduced to just ‘inventing’ the shape and lengths of the weld outline. This is not as dumb as it may sound, for example, for the weld shown in Fig 1 below, one may select the C outline that goes around the outside, shown on Fig 1, or just 2 horizontal runs, top and bottom, or one of many others. Having chosen the outline you then calculate the weld width. If there appears to be problems with that width, then nominate another outline and redo the calcs. Continue this for a while and you will be able to tell from the loads and the beam what for example is likely to be the weld outline that will requires least weld deposit. The weld deposit is the thing. The weld below joins 2 adjacent parts, the beam and the base plate, but the weld is the only ‘component’ being analysed here. It is assumed that the base plate is flat and that the beam meets it with a flat cross section. The beam does not have to be perpendicular to the plate, and the shape and size of the beam from the weld to the load has no effect on the weld calculation. The beam can be curved, bent and joined to other components. The only thing that matters is the relative location in space of the load to the Centre of Area (CofA) of the weld outline. The exploded view below can be replaced with Fig 2 where the location of the force and the weld outline are shown schematically. Figs 2 & 3 show how we arrive at the shear force, moment and torque that the weld has to be designed to carry. Fig 1
Analysis of planar welds
Jun 29, 2023
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