Transverse Crack on Parent Metal (SS201)

[G Gughan]

Dear Experts,

 

Please find the attached picture for your deep & clear interpretation. After welding I have found a few transverse cracks along the weld. What could be the reason behind this? Kindly do technical advice or prevention for my understanding.

The material spec is SS201.

Is it a Material defect or a Crack formed due to welding?

Crack induced after a few days of welding not during welding & after immediate welding.

Kindly note that the pipe was formed/developed from the plate by the cold rolling.

 

Your advice & comments will be highly appreciated.

 

Thanks,

Kind Regards,

G.Gughan

[Ahmed Osman]

is this longitudinal weld ?

This may be stress corrosion crack

* stresses from plate rolling and thermal weld stresses

* corrosion as it is appear in photo ( black spots ) and may be used tools containing halides ( marking colors ) .

* annealing after welding is very effective solution for reducing the tendency of stress cracking 

* pickling did after welding ?  

Best Regards ,

ENG. Ahmed Osman

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