purpose of doing nick-break test.

[bas karan]

Dear all
pls explain if any one know the purpose of doing nick-break test.

Thanks&regards
Baskaran.

[saRAVANAN]

Dear Mr Baskaran,

This test is performed to reveal internal imperfections such as slag inclusion, lack of fusion, incomplete penetration, porosity, etc in a butt weld.  A butt weld specimen is fractured along an artificial notch that is intentionally machined on the centre line of the fillet weld specimen to facilitate fracture in the centre of the weld. The fractured specimen cross section is then visually examined for imperfections.

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[Shashank Vagal]

Other intention is to get a measure of the ductility of the joint at the bend location. --- On Sun, 31/10/10, saRAVANAN <vivid...@gmail.com> wrote:

[waqqaar waqqaar]

The NICK-BREAK TEST is useful for determining the internal quality of the weld metal. This test reveals various internal defects (if present), such as slag
inclusions,  gas  pockets,  lack  of  fusion,  and  oxidized  or burned metal. To accomplish the nick-break test for checking a butt weld, you must first flame-cut the test specimens from a sample weld . Make a saw cut at each edge through the center of the weld

 thanx

Hafiz Waqar Zia 
Etimaad Qatar LL.C
QA/QC Dept.
Doha  Qatar
Cell: +97466598936
Email- Waqq...@hotmail.com 

 

 

---

Date: Sun, 31 Oct 2010 11:56:58 +0400
Subject: Re: [MW:7961] purpose of doing nick-break test.
From: vivid...@gmail.com
To: material...@googlegroups.com

[bas karan]

Dear sir   all the inperfection u mentioned can be detected by RT.then why we are doing nick-break.   pls explain in engineering point of view not inspection. thank you. Regards Baskaran. --- On Sun, 31/10/10, Shashank Vagal <nach...@yahoo.com> wrote:

[hpi001]

The Nick break test will also show any present lack of fusion between
the separate weld layers or on the weld bevels. During RT you won't
find such because of the radiation direction.

Best Regards,

Herman Pieper

[narasimha murthy]

 

The purpose of Nick Break Test - A nick break test involves breaking the weld joint to examine the fractured surfaces for internal defects such as:
(i) Gas pockets
(ii) Slag inclusions
(iii) Porosity.
The test also determines weld ductility and the degree of fusion.

Regards

 

J.N.Murthy