Welder qualification

[Krisanu Bhunia]

Daer.ALL

Please tell me cluster porosity acceptance limit for Welder qualification test as per ASME XI or VII.

 Regards

krisanu bhunia

[Sathish Kumar]

Dear Krisanu Bhunia and Experts,

FOR WELDER QUALIFICATION TEST

I would like to share my experience as below, ( correct me if I am wrong. )

From Quality point of View:

·         First thing is “ Welder qualification test” is done to determine the ability of a welder

to deposit sound weld metal.

·         Sound metal means a quality weld at first time. ( without making visual defects like cracks, undercuts, porosity, excess reinforcement, Etc. )

·         As per ASME SEC IX, the only visual criteria you could find as mentioned below:

·         QW-194 Visual Examination — Performance

Performance test coupons shall show complete joint

penetration with complete fusion of weld metal and base

metal.

From Production Point of View: -  During the test, If a welder making undercut or with Visual porosity – please reject him, before your client does the same, since this welder if qualified  - he will make more undercuts and porosity in the Job and uses grinder repeatedly / wastes precious time schedule of the project / off course increase the work of Welding Inspector and cannot make a productive output results. Hope you got the message.

AND FINALLY – Client have to decide !

Regards,

Sathish

Jazan, Saudi.

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[anand gupta]

Dear

For welder test piece must be free from all defects.

a p gupta

baroda

Sent from Yahoo Mail on Android

On Sun, 21 Aug, 2016 at 0:12, Krisanu Bhunia

<krisan...@gmail.com> wrote:

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[Mukkaish K]

Dear Krisanu Bhunia, 

Refer to clause no. QW-191.1.2.2 (b) (3) Qualification Test Welds of the ASME Sec IX - 2015 -- Assuming test coupon is greater than 3 mm.

You can get the acceptance criteria for cluster porosity.

Regards

MK

[Krisanu Bhunia]

Thank for information.
But for cluster porosity in radiography have any accepting limitations or not ?
What is the limitations if it have ?

[ammar maghami]

Dear krisanu

Hi

For cluster porosity  acceptance criteria you must characterized the type of material and specification and then interpretation this imperfection.

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