The fillet weld is not connected to the weld toe
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Is it feasible not to weld the fillet weld of the combined weld in Figure (1) up to point A, the root of the butt weld? Are there any adverse effects compared to conventional diagrams (2) where it is welded to the weld toe? (Node timing tube sheet + shell side cylinder)
The stress distribution in this area is relatively complex; a regular design approach cannot determine the stress distribution here. As a result, it is difficult to determine whether the bearing area shown in Figure 1 is sufficient, and the overlap of the heat-affected zones is also problematic. Figure 2 shows that the weld toe structure not only provides a large bearing area but also serves to heat-treat the previous weld.
It should be connected to point A; otherwise, the weld will be weakened and structural stress will occur.
This post was last edited by zjq1962 on 2020-10-20 at 13:02. It is feasible to use the first ASME structure; this joint actually consists of two types of welds: one is a groove weld and the other is a fillet weld. The groove weld needs to be smoothed. The groove weld ensures tensile strength, while the fillet weld ensures shear strength.
The connection strength is reduced, weld discontinuities increase, which leads to higher local stresses.
1. When the root leg height reaches 0.7δ, the difference between the two structures becomes negligible； 2. In actual production, the issue raised by the poster doesn’t exist; in practice, welders* habit is to keep welding until the weld toe is reached ；