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Weld joint coefficient in JB/T4735-97

2007-12-10View Original

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In standard JB/T4735-97, clause 12.4.1.1 specifies that for formula 12–4, φ=0.9; however, clause 3.7.2 states that 0.9 is applicable only when 100% non-destructive testing is carried out. So, is 100% non-destructive testing required for the cover plates? Obviously impossible and unnecessary? So what does the 0.9 parameter mean? :L

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