Re: [MW:13252] IMPACT TEST -SUB SIZE

Dear Sir,

According to ASTM A370 part 26.3, the choose of temperature reduction or changing the acceptance criteria or both of them is based on your contract. If you need to change the acceptance, you can use table 9 and if you have to change temperature you can use table UG-84.2 of section 8, div.1.

But here we have a note, but it is my interpretation.

The reduction in the temperature (if needed) shall calculate from the diference between the actual thickness of the material and the size of the specimen. In your case because you use two different processes, we can consider each process as an individual thickness. So you may make a set of impact specimens from GTAW with 3.33x10 mm sub-size standard specimen and a set of specimens from SMAW with 5x10 mm sub-size standard specimen which both of them do not need any reduction in temperature because in the case of GTAW the nominal thickness is 4mm and your specimen is 3.33 and 3.33 is mor than 80% of 4 mm. Also it is true about SMAW part.

 

In the othe way, you can consider that you wand make  specimens from multi-process welded joints regardless of the processes. In your case you can make a 7.5x10 sub-size standard specimen without any reduction in the temperature because 7.5mm is more than 9mmx80% or 7.2mm.

 

Regards

On Wed, Dec 21, 2011 at 11:30 AM, james gerald <gerry_tup@yahoo.com> wrote:

Sizing can be done either at the root or cap and subsize of 5mm can be obtained with the notch located in the particular process.

 

Yes the test temperature of  -40.1°C. is correct.

 

If the Full size(10x10mm) requirement is 34J then for subsize(10x5mm)  16J is acceptable

 

 

Thanks & Reagrds
 
J.Gerald Jayakumar
00968-93281596

From: Rajagopal Kannan <rajagopal.kannan@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wednesday, December 21, 2011 9:57 AM
Subject: Re: [MW:13244] IMPACT TEST -SUB SIZE

Hi,

It is not practical to go for 5mm thk. with the weld deposit of 5mm.

You have to go for lesser dimensions.

Thanks,

K.Rajagopal

On Wed, Dec 21, 2011 at 8:15 AM, Sundaram Elumalai <Elumalai.Sundaram@starfab.com.sa> wrote:

Hi,

 

Now we are qualifying two new PQR for new project for less base metal

thick. (9mm). Code AWS D1.1

 

ROOT / HOT Pass              -GTAW (deposited 4mm)

Fill/Cap                                - SMAW (deposited 5mm)

 

We need to perform the impact test as per Client Welding spec for each process.

In this case, we have to go for Sub size with temperature reduction.

 

Client Welding spec requirement is minimum - 29 °C. 

 

If I go with 10x5mm sub size, I need to reduce 11.1 °C  and test to be

done at -40.1°C. (  -29 -11.1) 

Then Joule value will considered as per ASTM 370,16 J from the below

second table.

 

Is it correct ?

 

With Kind Regards,

 

S.Elumalai.

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