Tuesday, September 2, 2014

Re: [MW:21786] RE: Cracks hair line appearing after welding hard facing electrode

It is not a bad thing and is unavoidable and normal in many hard-facing jobs (higher hardness range). These hairline cracks are "good" if they form a regular "check" pattern. They call these cracks "checking cracks". Do not try to fight these cracks otherwise a deep & long will appear ant the end of the working hours.  In hard-facing, many refer to these small checking-cracks as an indication of a good wear resistance overlay welding (not in all cases)...!!!
 

Best Regards

Ramin Kondori

Sr. QA/QC engineer

Yadavaran Oilfield Project

SIPC (SINOPEC)



On Tue, Sep 2, 2014 at 7:04 AM, Shomenath Bagchi <snbagchi@ymail.com> wrote:
You can also try preheating to lower rate of cooling to lessen cooling cracks as well.
For correct answer, require fuller information on the particular welding process.

S.N.Bagchi
Welding technologist/ metallurgist


On Sunday, August 31, 2014 10:41 PM, pgoswami <pgoswami@quickclic.net> wrote:


Hi ,Suryanarayanan,
 
Some cracks are common with hardfacing alloys, due to their inherently low ductility. This could be minimized by using a Ni-based barrier layer for some type hardfacing alloys (Stellite-6, 12 ).
 
I hope you'll find the information in the attachment as quite useful.
 
What's the type of hardfacing electrode used for weld deposition??
 
Appreciate your response.
 
Thanks
 
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of george.dilintas@gr.bureauveritas.com
Sent: Saturday, August 30, 2014 9:14 AM
To: materials-welding
Subject: Re: [MW:21764] RE: Cracks hair line apprearing after welding hard facing electrode

You mean residual stresses cracks
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

  From: Kannayeram Gnanapandithan [kgpandithan@gmail.com]
  Sent: 08/30/2014 10:19 AM ZE5B
  To: materials-welding@googlegroups.com
  Subject: Re: [MW:21758] RE: Cracks hair line apprearing after welding hard facing electrode

it is stress relief cracks

THANKS & BEST REGARDS
KG.PANDITHAN, AWS-CWI, CSWIP 3.1
CONSULTANT-WELDING & QUALITY


On Sat, Aug 30, 2014 at 10:02 AM, jsn <jsn@cal2.vsnl.net.in> wrote:
Dear ,
 
Can please explain why hair line cracks are appearing after welding with ahand facing electrode
 
I have used a build up electrode  layer - 2
and 1 or two layers with hard facing electrode  a hair line crack at varius intervals.
 
I am informed that since it is hardfacing electrode hair line cracks will appear
 
= s p raman=
J.Suryanarayanan

 
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