Regarding the calculation of the cross-sectional area of the reinforcement fillet weld on the branch pipe
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Both GB/T 20801 and GB 50316 provide calculations for branch pipe reinforcement. Which formula should be used when calculating the cross-sectional area of the A3 fillet weld? There is no clear calculation formula specified in the standards, which is quite confusing.
Generally, the root thickness of the corner welds on the tube sheet should be no less than 6, and also no less than the wall thickness of the tube; for the cross-sectional area of A3, 6x6=36 is sufficient. During software calculations, it turns out that including this value in not all calculations increases the strength of the weld; that is, sometimes the wall thickness as determined by this assumed value passes the verification, while at other times, a thickness that previously passed the verification fails to do so after this value is included.
20801 does not represent the thickness that has been verified; it should be the calculated reinforcement area. There is indeed a formula used in practical calculations, but where does this formula come from? Or why is it calculated this way?