[MW:13248] RE: 13243] IMPACT TEST -SUB SIZE

Dear Elumalai,

Nice to hear from you.

 

If we do impact testing at the specimen size of 10 X 7.2mm (i.e 80% of 9mm) there is no need of reduction in temperature

 

If we are using a sub size of 5mm (i.e lesser than 80% of original) then we have to go for reduction in temperature

As per AWS D1.1- 2008 table 4.14 note (C ) and table 4.15 for this case further reduction of 11.1°C is required  i.e -29 – 11 = -41.1°C (9mm-5mm)

 

The observed energy required for sub size as per note of table 4.15 and ASTM A370 Table 9 is 14 Joules average and 11 joules individual

 

 

 

 

 

 

 

 

 

 

 

Cheers

MM

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Sundaram Elumalai
Sent: Wednesday, December 21, 2011 8:16 AM
To: materials-welding@googlegroups.com
Subject: [MW:13243] IMPACT TEST -SUB SIZE

 

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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