where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

ULTRASOUND INSTITUTE
The Ultrasound Institute can develop new advanced ultrasonic measurement, imaging and NDT techniques for non-conventional applications.

3580 views
Technical Discussions
Norman Thomsen
Norman Thomsen
00:31 Feb-13-2008
AWS D 1.1 UT indication rating, straight probe


Table 6.2 of above standard only gives acceptance/rejection criteria for indications measured with angle probes. How is an indication evaluated when detected and measured with a straight probe? This is relevant for a T-joint.
Thanks,

Norman


    
 
 
chris s
chris s
02:28 Feb-14-2008
Re: AWS D 1.1 UT indication rating, straight probe
----------- Start Original Message -----------
:
: Table 6.2 of above standard only gives acceptance/rejection criteria for indications measured with angle probes. How is an indication evaluated when detected and measured with a straight probe? This is relevant for a T-joint.
: Thanks,
: Norman
------------ End Original Message ------------


a straight probe ( 0 degree) is not used for inspection of welds per AWS D1.1 the only thing that it is used for is your lamination examination prior to angle beam scanning. that is why there is no accept/reject criteria. the inspection of a t-joint from the "c" face would be performed with an angle beam.



    
 
 
Norman Thomsen
Norman Thomsen
02:56 Feb-21-2008
Re: AWS D 1.1 UT indication rating, straight probe
----------- Start Original Message -----------
: :
: : Table 6.2 of above standard only gives acceptance/rejection criteria for indications measured with angle probes. How is an indication evaluated when detected and measured with a straight probe? This is relevant for a T-joint.
: : Thanks,
: : Norman
:
: a straight probe ( 0 degree) is not used for inspection of welds per AWS D1.1 the only thing that it is used for is your lamination examination prior to angle beam scanning. that is why there is no accept/reject criteria. the inspection of a t-joint from the "c" face would be performed with an angle beam.
------------ End Original Message ------------


Chris, thanks for your reply.
I don't agree with your statement, that an angle probe should be used from face C. It makes sense to use a straight probe, and the standard even specifies use of an angle perpendicular to the fusion line. Use of a straight probe from face C is a very good technique, but i believe the standard should specify rating criteria for this technique. A comment from AWS would be helpful.
Thanks,
Norman



    
 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 278

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
03:54 Feb-21-2008
Re: AWS D 1.1 UT indication rating, straight probe
----------- Start Original Message -----------
: : :
: : : Table 6.2 of above standard only gives acceptance/rejection criteria for indications measured with angle probes. How is an indication evaluated when detected and measured with a straight probe? This is relevant for a T-joint.
: : : Thanks,
: : : Norman
: :
: : a straight probe ( 0 degree) is not used for inspection of welds per AWS D1.1 the only thing that it is used for is your lamination examination prior to angle beam scanning. that is why there is no accept/reject criteria. the inspection of a t-joint from the "c" face would be performed with an angle beam.
:
: Chris, thanks for your reply.
: I don't agree with your statement, that an angle probe should be used from face C. It makes sense to use a straight probe, and the standard even specifies use of an angle perpendicular to the fusion line. Use of a straight probe from face C is a very good technique, but i believe the standard should specify rating criteria for this technique. A comment from AWS would be helpful.
: Thanks,
: Norman
------------ End Original Message ------------

This issue is not new and the original comment by Chris has validity in that AWS D1.1 does not outline a sceanario where the accept/reject decison would be made solely on the use of a straight beam scan. hence there is no specific reference to it in the code.

I have run into this issue numerous times where no angle beam access is possible. As such you need to design an acceptance criteria based on the loading of the structure and the guidance in the document that then ensures fitness for purpose. It then becomes a client specification.

The alternative is to draft a technical inquiry to AWS requesting a future amendment to code.



    
 
 
theo micottis
theo micottis
06:32 Feb-21-2008
Re: AWS D 1.1 UT indication rating, straight probe
----------- Start Original Message -----------
Hello, I think straight probe is helpful to characterize type of indication.From face C you can immediately characterize slag or lack of fusion if you have any doubt


    
 
 
David J. Reid
David J. Reid
00:33 Jul-25-2008
Re: AWS D 1.1 UT indication rating, straight probe
From what I have observed, which is from the ASME code side of the house, it is accepted standard practice when performing "soundness" examinations (using a 0 degree transducer to look for cracks) you set the back refelection from the part being examed at 8 on the horiziontal scale and adjust the gain to get 100 percent FSH. Any indication that has an amplitude of 20 percent or more and / or if there is a total loss of the back refection is cause for reject.

Problem is you won't find that in the ASME code. However if you were to take a basic ASME non-piping cal block you can see where it makes sense. Once you get 100 percent FSH on the defect free part of the block, put it above the 3/4 T hole. The amplitude from it is about 20 percent.

----------- Start Original Message -----------
: : : :
: : : : Table 6.2 of above standard only gives acceptance/rejection criteria for indications measured with angle probes. How is an indication evaluated when detected and measured with a straight probe? This is relevant for a T-joint.
: : : : Thanks,
: : : : Norman
: : :
: : : a straight probe ( 0 degree) is not used for inspection of welds per AWS D1.1 the only thing that it is used for is your lamination examination prior to angle beam scanning. that is why there is no accept/reject criteria. the inspection of a t-joint from the "c" face would be performed with an angle beam.
: :
: : Chris, thanks for your reply.
: : I don't agree with your statement, that an angle probe should be used from face C. It makes sense to use a straight probe, and the standard even specifies use of an angle perpendicular to the fusion line. Use of a straight probe from face C is a very good technique, but i believe the standard should specify rating criteria for this technique. A comment from AWS would be helpful.
: : Thanks,
: : Norman
: This issue is not new and the original comment by Chris has validity in that AWS D1.1 does not outline a sceanario where the accept/reject decison would be made solely on the use of a straight beam scan. hence there is no specific reference to it in the code.
: I have run into this issue numerous times where no angle beam access is possible. As such you need to design an acceptance criteria based on the loading of the structure and the guidance in the document that then ensures fitness for purpose. It then becomes a client specification.
: The alternative is to draft a technical inquiry to AWS requesting a future amendment to code.
------------ End Original Message ------------




    
 
 

Product Spotlight

FD800 Bench Top Flaw Detectors

The bench-top FD800 flaw detector range combines state-of-the-art flaw detection with advanced mater
...
ial thickness capabilities. Designed for use in the laboratory these gauges are the tool you need for all your flaw detecting needs.
>

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

Navic - Steerable Modular Automated Scanner

The Navic is a modular, motorized, steerable scanner designed to carry multiple attachments used
...
in various scanning and inspection applications. The Navic is capable of weld scanning (girth welds and long seam welds), automated corrosion mapping, and tank scanning.
>

Research Center IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque Research centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system f
...
or the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window