We would like to cut out a 16mm butt weld on an existing precipitation tank shell, and place a new weld only approximately 100mm from where the old weld was. This is far less than that specified in API 650 (250mm). We can test a sample of the weld and plate around the HAZ; do we need to look for metallography changes only, or are there other factors that influence weld toe to toe distances?
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Factors influencing weld toe to toe distance requirements
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