Re: [MW:27807] AWS D 1.1 interpretation on Increase in Preheat / Interpass temperature

In ASME, % carbon is restricted to max 0.35%, where as in AWS it is more and properties will be deteriorated if use higher Pre Heat than qualified. That is why it is restricted.

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

On Tue, May 8, 2018 at 1:03 PM, George Dilintas <dilintas@gmail.com> wrote:

in ASME IX also the increase is only for the interpass temperature and the decrease for the preheat.

The increase of interpass is a supplementary essential variable

the decrease of preheat is an essential one

2018-05-02 6:54 GMT+03:00 N VENKATESWARA PRASAD <weldengr.velosi@gmail.com>:

Dear Experts,

We have received a comment on Increase in Preheat temperature greater than 56°C is essential variable as per AWS D.1 from our client.

My interpretation is the increase in 56°C is applicable only for inter pass temperature.  The details are as given below. 

 

PQR   Test coupon thickness        :  30 mm

PQR   Preheat temperature          :  30°C

PQR Inter pass temperature        :  173°C

 

Job Thickness                                  : > 38 mm  to 65 mm  ( As per Table 3.3)

Preheat temperature                    :  110°C

Inter pass temperature                 :  220°C

MDMT                                               :  -40 °C

 

As per AWS D 1.1  Table 4.6  Point no. 7   an increase more than 56°C in max preheat or interpass temperature is essential variable  for CVN testing applications.

 

Based on the above clause, the client is insisting that the Qualified Range for  thickness in WPS shall be restricted to 38 mm as the preheat is increased from 30°C to 110°C which is not acceptable .

 

Please provide me if you any interpretation on it from AWS.

Regards

Prasad

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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