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Technical Discussions
Aravind
Aravind
05:28 Mar-27-2019
Root Bead Echo or Defect Echo

Dear Inspectors,

Could you please answer the following doubt's from UT

1. How to identify whether the echo signal from the Root bead is a defect signal or Root bead Signal?

2. Similarly Whether the echo signal from the weld cap is a Defect signal or Cap signal?

    
 
 Reply 
 
Manuel Haces
Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection, Mexico, Joined Jun 2002, 122

Manuel Haces

Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection,
Mexico,
Joined Jun 2002
122
18:54 Mar-27-2019
Re: Root Bead Echo or Defect Echo
In Reply to Aravind at 05:28 Mar-27-2019 (Opening).

Take a Level 2 course. You will see how it is relative quite easy from geometry in a complete joint penetration weld to find out where is the echo reflecting. I hope it help in a general way.

    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
03:58 Mar-31-2019
Re: Root Bead Echo or Defect Echo
In Reply to Aravind at 05:28 Mar-27-2019 (Opening).

1. Look for crossover of probe stand off distances from weld centre line. Crossover implies sound root. No crossover suspect lack of root penetration

2. Maintain a clear root geometry signal on a lateral scan parallel to the weld. A 'step in' of screen beam path distance ' from normal implies root defect.

    
 
 Reply 
 
Clair D'El Rei
Clair D'El Rei
22:19 Apr-01-2019
Re: Root Bead Echo or Defect Echo
In Reply to Aravind at 05:28 Mar-27-2019 (Opening).

First hand visualizing this type of discontinuity without having access to the inner side of the weld for those with little experience gets confused. First check that there is no welding deformation (misalignment or embedding) in the weld to be inspected.
Please read carefully the API RECOMMENDED PRACTICE 2X
Recommended Practice for Ultrasonic and Magnetic Examination of Offshore Structural Fabrication and Guidelines for Quali fi cation of Technicians.
In this item you will see a way to check indications at the root of the weld.
If you need more information, please contact us at kalldellrei@hotmail.com

    
 
 Reply 
 
Clair D'El Rei
NDT Inspector,
I am looking for a new opportunity in the labor market and I accept proposals from other countries i, Brazil, Joined Feb 2019, 15

Clair D'El Rei

NDT Inspector,
I am looking for a new opportunity in the labor market and I accept proposals from other countries i,
Brazil,
Joined Feb 2019
15
22:24 Apr-01-2019
Re: Root Bead Echo or Defect Echo
In Reply to Aravind at 05:28 Mar-27-2019 (Opening).

Carefully read section 7.7.3.2 of API RECOMMENDED PRACTICE 2

    
 
 Reply 
 
Aravindan
Aravindan
15:55 Apr-02-2019
Re: Root Bead Echo or Defect Echo
In Reply to Clair D'El Rei at 22:24 Apr-01-2019 .

Sir,
Thanks for the clarification.

Is it same for Butt weld as Well.

    
 
 Reply 
 
virendra
NDT Inspector,
India, Joined Sep 2012, 2

virendra

NDT Inspector,
India,
Joined Sep 2012
2
15:33 Apr-03-2019
Re: Root Bead Echo or Defect Echo
In Reply to Aravind at 05:28 Mar-27-2019 (Opening).

This is based on probe position with respect to weld centerline, indication noted before half and full skip distances may be reflection from flaws

calculated beam path according to thickness and checking surface distances helps to know the location and type of flaw.

    1
 
 Reply 
 

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