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Technical Discussions
jagadish
jagadish
10:53 Jul-03-2011
difference between wagon track and elongated slag inclusion

Is there any justified difference between wagon track and elongated slag inclusion. Please clarify.

 
 Reply 
 
Elmar van den Elzen
Engineering,
Lismar Engineering B.V., Netherlands, Joined Aug 2000, 15

Elmar van den Elzen

Engineering,
Lismar Engineering B.V.,
Netherlands,
Joined Aug 2000
15
14:40 Jul-03-2011
Re: difference between wagon track and elongated slag inclusion
In Reply to jagadish at 10:53 Jul-03-2011 (Opening).

Dear Jagadish,

I can't say for sure in general, but when talking about steel mill rolls, by a wagon track is meant a narrow fatigue path in the roll. Typically these start at the surface of a roll and from there a narrow fatigue path grows into the roll. Slag inclusion is, of course, something completely different.

Best regards, Elmar van den Elzen

 
 Reply 
 
LK
NDT Inspector,
Norway, Joined May 2008, 104

LK

NDT Inspector,
Norway,
Joined May 2008
104
14:41 Jul-03-2011
Re: difference between wagon track and elongated slag inclusion
In Reply to jagadish at 10:53 Jul-03-2011 (Opening).

Wagon tracks are ESI on both bevel sides

 
 Reply 
 
S.Senthilkumar
Engineering, QA/QC/NDT
NOV (National Oilwell Varco), Angola, Joined Mar 2006, 42

S.Senthilkumar

Engineering, QA/QC/NDT
NOV (National Oilwell Varco),
Angola,
Joined Mar 2006
42
15:12 Jul-03-2011
Re: difference between wagon track and elongated slag inclusion
In Reply to Elmar van den Elzen at 14:40 Jul-03-2011 .

Two line (Railtrack) of ESI form. Due to improper cleaning between susequent passes. In API 1104 you see this word in RT Acceptance criteria.

 
 Reply 
 
Juan Amado
Engineering, Inspection
Arco Industrial, S.A., Panama, Joined Nov 2001, 44

Juan Amado

Engineering, Inspection
Arco Industrial, S.A.,
Panama,
Joined Nov 2001
44
17:16 Jul-03-2011
Re: difference between wagon track and elongated slag inclusion
In Reply to jagadish at 10:53 Jul-03-2011 (Opening).

Dear Jagadish:

In welding, “wagon tracks” is a name given to the specific type of slag inclusion that occurs at both sides of an intermediate weld bead (usually because of poor cleaning) where the slag is trapped at the toe of the bead and runs longitudinally along the weld. The radiographic image of this type of slag inclusion will be a pair of parallel lines varying in thickness and may even be broken at times, and resemble the tracks of a wagon.

Wagon Tracks is a specific type of elongated slag inclusion.

Hope this helps!

 
 Reply 
 
Kevin Paul Humphreys
NDT Inspector,
ALS, Australia, Joined Jun 2011, 13

Kevin Paul Humphreys

NDT Inspector,
ALS,
Australia,
Joined Jun 2011
13
01:50 Jul-04-2011
Re: difference between wagon track and elongated slag inclusion
In Reply to Juan Amado at 17:16 Jul-03-2011 .

Jagadish,
As mentioned wagon tracks are parallel linear slag inclusions. These generally occur between the first and second weld passes or layers. They may also occur in the root of pipe welds between a backing ring which does not fit tightly and the edge of the weld.
Wagon tracks occur most commonly in stringer passes, particularly near the weld root where slag remaining was not cleaned out of the crevice formed between the bead edge and the base metal.
In pipe welds, fine indications of wagon tracks may be caused also by base metal shrinkage adjacent to the weld edge between root pass and backing ring
Regards,
Kevin

 
 Reply 
 
jagadish
jagadish
07:03 Jul-04-2011
Re: difference between wagon track and elongated slag inclusion
In Reply to LK at 14:41 Jul-03-2011 .

Thanks for the responses. API 1104 states that wagon tracks occur at both sides of root. based on this statement may i confirm that this statement applies for elongated slag inclusion also and elongated slag inclusion does not appear any where in the weld apart from the zone between root and hot pass.

 
 Reply 
 
Jon Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
08:16 Jul-09-2011
Re: difference between wagon track and elongated slag inclusion
In Reply to jagadish at 07:03 Jul-04-2011 .

No.
Wagon tracks, as previously stated, occur specifically between the root and the hot pass and as such, will present on the radiograph as two parallel slag lines on either side of the root.
Elongated slag inclusions can (and do) occur anywhere in the weld. Slag is in both cases a product of insufficient cleaning of the weld groove before the next weld layer is laid down.
Slag can occur either on the side wall or between weld runs.

 
 Reply 
 
jagadish
jagadish
06:29 Jul-10-2011
Re: difference between wagon track and elongated slag inclusion
In Reply to Jon Wallis at 08:16 Jul-09-2011 .

Thank you very much john for the appreciable and justified answer. I wanted to confirm the same.

 
 Reply 
 

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