Verified gap of socket weld?

Why we need to verify the gap of socket weld?

To permit the thermal expansion of pipe during welding operation.

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Thanks and one more questions:

  1. Max. and Min. in mm are allowed?
  2. Which NDT method application to check the gap?

Generally 1.5mm before welding & i dont know in depth.
RT is used for measuring the gap after welding.

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Only shot a film to verify the gap, no IQI selection, right?
In this case, we also review the throat thickness of fillet weld.

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