I guess not.

An unfinished weld is gernerally considered by most Codes as "not ready" for any NDT. But for very heavy thickness or big weld size the fabricator may choose to perform such NDT with the identical procdure and criteria as that of the finished weld to detect defects earlier in order to make the repair not that difficult and costly.

Hi Hanif

I don't think you will find a mandatory NDT requirement (other than visual) specified in either D1.1 or any AISC structural standard for an inter-pass scenario.

However,  AISC 360 Chapter N does specify inspection tasks for before, during and after welding.

Inspection Tasks During Welding   Table N5.4-2 specifies inspection to verify inter-pass cleaning, profiles within limits for each pass as well as each pass meeting quality requirements.

This clause can be leveraged just about any way you like within the scope of your own quality plan/manual or WPS, or work instructions to perform any NDT you wish to use to validate continuous quality.

You could also generate a project specific ITP  (Inspection Testing Plan) which includes inter-pass NDT and use Chapter N as the external standard.  This could be submitted to the customer or the fabricator and agreed to for a specific project.  But remember...  While in compliance with Chapter N, it also exceeds it, and someone will have to pay.

Just be mindful about how you specify the inspections tasks in your QAM, WPS, or work instructions, because they are a bell you can't unring in an audit.   If you say you shall do it.  You need to do it.  So specifying the situation for NDT, the volume of NDT, or the randomness of NDT would be important.

Example:   We perform periodic MT testing on back-gouged CJP welds (after the backing weld is removed) to validate the welder has reached sound metal.  This is done more often when new welders are getting up to speed or when an individual welder has a UT first pass yield of less than 95%.

I've also seen scenarios on very large weldments (not necessarily structural steel) where UT is performed on a partially completed joint to reduce the risk of damaging/costly rework later on if a defect were to be found.   This would require your Level III UT operator to develop procedures and train the technicians to do the special work.