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If our two welds are ¼-inch fillets then the shear strength (load carrying capacity) of the welds is calculated as follows. First, we rearrange the formula provided above to solve for F. We already know that the allowable shear stress is 70,000 x 0.30 = 21,000 psi. To get A (effective area of the weld) we need
Now we go back to our main formula. Because we are using an ER70S-6 wire, is equal to 70,000 psi. Now we have all the values except for the one we are solving for, F. We rearrange the formula to solve for F. F = (70,000) x (7.08) = 495,600 lbf
When we determine the allowable shear stress on a weld we use the minimum specified tensile strength of the filler metal. All AWS electrode classifications reference tensile strength as in ER70S-6 for GMAW filler metals where the “70” means 70,000 psi minimum tensile strength.
For instance, a member can experience a tensile stress of 10ksi followed by a compressive stress of -5ksi. This would mean that the stress range is 10 – (-5) = 15ksi. The larger the stress range the lower the fatigue life. EXAMPLE: An engineer is designing a structure. The calculated stress range for this structure is 20ksi.
Measuring fillet weld legs is meaningless, well… not really. Fillet weld leg sizes are very important, but simply measuring the leg of a fillet weld does not tell us if we actually achieved the desired throat dimension. The strength of a fillet weld is determined by its effective throat. As you can see in the […]
Many fabricators can lower their welding costs significantly if they paid close attention to weld sizes. If a print calls for a ¼” fillet weld and in production you make a 5/16” fillet weld, you are overwelding by 56%! If the print calls for a 3/16” fillet, the 5/16” fillet weld you deposit would be […]
Hello Petrus. Travel speed is simply distance divided by time. So if it took you 6.8 minutes to travel 300mm your travel speed would be 300mm/6.8min = 44.1 mm/minute. Or 0.735mm/sec. Then simply follow the formula given HEAT INPUT = (60 x Amps x Volts) / (Travel Speed) = Joules/mm
Still, this by itself was not enough to create the failure. Upon examining the failed samples it was discovered that all which had failed had undercut where there the crack initiated. The toe of a fillet weld is always a high stress point. Add a brittle HAZ and an additional stress riser (undercut) and you have a recipe for disaster.
T here are four types of loading experienced by welds and welded structures. These types of loading are a function of the strain rate (the rate at which deformation occurs in a material due to an applied load) and the number of loading cycles experienced by the welded member.
Have you ever noticed that there are design rules that prohibit sizing a fillet weld below a certain size for a given thickness of material? If you look at AWS D1.1/D1.1M:2020 Structural Welding Code (Steel) you can find this on Table 7.7. If you happen to own a copy of AISC 360-16 Specification for Structural […]