Re: [MW:18476] Clarification on Sec. IX interpretation: IX-92-87

PQR qualified on 1" thickness (with notch toughness) qualifies for minimum thickness of 5/8" as per QW-403.6. Maximum remains at 2"

Octane

On Mon, Aug 19, 2013 at 1:38 PM, Harikrishnan N S <hari.qaqc@gmail.com> wrote:

Interpretation: IX-92-87

Subject: QW-403.6, Base Metals; and QW-409.1, Electrical Characteristics

Date Issued: February 14, 1994

File No: 93-151

 

Background: Two PQRs have been qualified to support a WPS with notch toughness requirements and having a qualified base metal thickness range from 5/16 in. to 2 in. inclusive. One PQR was qualified on 1 in. thick material with a maximum heat input of 85,000 J/in. The second was qualified on 5/16 in. thick material with a maximum heat input of 45,000 J/in. All other essential and supplementary essential variables are the same.

 

Question (2): Is the heat input value of 85,000 J/in. applicable to base metal thicknesses between 5/8 in. to 2 in. and the heat input value of 45,000 J/in. applicable to base metal thicknesses between 5/16 in. and 5/8 in.?

 

Reply (2): Yes.

My Query:

1)    1)  Why they are limiting heat input based on material thickness as material thickness is not involved in heat input calculation? Is this related to cooling rate?

2)     2) For PQR done on 1in. thk. with max heat input of 85,000 J/in. How they calculated the minimum qualified thk. as 5/8 in. (isn't it 1 in. to 2 in.?)

Re

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