(Assuming ultimate tensile strength of base material as 430 N/mm 2) Step-4: Calculate design strength (Pw): The design weld strength for the material can be calculated using the eq.2 as: The equation for calculating the (unit throat length) polar moment of inertia for rectangular shaped fillet welding connection is, The shape of the welded joint, in the above example, is rectangular in shape with two sides as Y and Z respectively. Step-3: Calculate unit throat polar moment of inertia (Ju): The polar moment of inertia of any shape is the sum of the area moment of inertia of the shape about the XX axis and that of the YY axis. Step-2: Calculate the unit throat weld area (Au) : The unit throat weld area for the example problem is: And we can locate the COG, which is marked as C, as below: So, obviously, the COG will be at the intersection of the two diagonals of the rectangular. In the example above, we have a rectangular shaped weld area. Step-1: Calculate COG: Find out the centre of gravity (COG) of the whole fillet weld joint scheme. Calculate the fillet weld size required for the application.įillet Weld Strength Design Calculation in Torsion Example Problem statement: Look at the design of the welded connection below, its a cantilever kind of structural joint where the fillet welds are subjected to the torque developed due to the load F. The overall procedure explained in the weld design calculation for bending article will holds good in this article as well with only major difference is the use of polar moment of inertia (J) instead of the area moment of inertia (I) since we are talking about torsion here.īit confusing? Well, we are going to understand the procedure in detailed step by step manner here with the following example:

Welding calculator excel