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Subject: soak band width gen. что такое soak band width при сварке?Спасибо! Minimum PWHT soak band width shall be 3x (times) the wall thickness at the weld of the thicker part being joined, with the weld in the middle of the band. The same applies for branch welds. For non-pressure attachment welds, the minimum soak band for PWHT shall be 2 times the pipe thickness on either side of the attachment weld.
The soak band for both nozzle welds and attachments shall extend completely around the pipe, or header.
Special consideration shall be given to the placements of heating elements and thermocouples when heating welds adjacent to large heat sinks such as valves or flanges, typically with different thickness, to ensure even heating rate and equal soaking temperature is achieved. It is important that no part of the heat-treated material exceeds the lower critical temperature of material. This is particularly important for Grades 91 and 92.
The correlation between the wall thickness and the minimum soak band width is illustrated in Figure 11.
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