The only example of such guidance is AWS D1.1, which includes the following table ( size=leg length): International standards do not generally provide requirements or guidance on minimum fillet weld sizes. Failing this, as a rule-of-thumb at least two passes should be deposited, with a minimum leg length of 6mm (1/4in), considering that the first run is likely to be defective. In such cases, one should get back to the designer. Unfortunately, there are many instances in which a fillet weld sizes is unclear on the available drawings, not reported, or simply the information has been lost. Once a fillet weld size has been calculated, it should be reported on the technical drawing(s), using the appropriate welding symbols or provided in a technical specification. Click here to see our latest technical engineering podcasts on YouTube. Methods for the calculation of fillet weld sizes are explained here. The size of a fillet weld should be calculated by the designer of the welded structure, based on the nature and magnitude of applied loads, on the material and on the design basis. National Structural Integrity Research Centre.Structural Integrity Research Foundation.
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