Regarding failure in bend test

[Chirag Sandhane]

Dear experts,

We have welded SA 240 TP310S to SA 240 TP310S plates with ER 310 filler wire. We get RT clear of the joints but get cracks in root & face bends. I am attaching photo of the same. Please give your expert advice for the same.

Thanks & regards,
Chirag Sandhane

[Harish Kannepalli]

Hi Chirag,

                It seems the weld is sensitized. Please do micro examination to confirm the same.

 

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[J Prinsen]

For almost sure they will be hot cracks, due to too high heat-input (over 2.0 kj/mm) too high interpass (over 100°C) or lack of cleaning combination of these factors

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Van: "Chirag Sandhane" <chirags...@gmail.com>
Aan: material...@googlegroups.com
Verzonden: Vrijdag 25 september 2015 08:45:44
Onderwerp: [MW:23537] Regarding failure in bend test

[pgoswami]

Hi Chirag,

 

SS. 310 is a fully austenitic stainless steel and well known for hot cracking. Welds do solidify with very little or low( as low as 0%) delta ferrite. Delta ferrite is a "trap" for all impurities, such as "S" and"P".

Cracking phenomena in 310 S.S welds  is called "Hot Cracking", is further aggravated by the presence of higher "C". in the weld( which may be the case  ER-310 filler metal).

 

Advice would be to get a filler/ electrode( 310L grade) with very low "S" and "P" and"C". The  attached data sheet  is for your reference. Also you may read through this paper (LINK BELOW) to get detailed guidelines for solidification /hot cracking problem in fully austenitic stainless steels.

 

 

Thanks.

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineering Specialist

Hamilton, Ontario, Canada

pgos...@quickclic.net

pradip....@gmail.com

ca.LinkedIn.com/pub/pradip-goswami/5/985/299

 

http://www.ias.ac.in/sadhana/Pdf2003JunAug/Pe1119.pdf

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Harish Kannepalli
Sent: Friday, September 25, 2015 6:24 AM
To: Chirag Sandhane; material...@googlegroups.com
Subject: [MW:23540] RE: 23537] Regarding failure in bend test

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/560520bf.61bcb40a.9768e.ffffcc61%40mx.google.com.

[Alan Denney]

Dear Pradip

 

I hope I may use your photograph in a presentation I am giving next month on cracking in welds and at a UK university.

 

Best wishes

 

Alan

 

 

Alan Denney

AKD Materials Consulting Ltd

 

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