[MW:13789] effect of SOOT formation on base material

Dear All,

 

Greetings.

 

During preheating of a weld joint  SOOT( Black spots) was observed on the base material ( SA 516 GR 70- 50 Thk). Please refer attached photo.

 

Please explain is there any  adverse effect on base material becuase  of the SOOT formation.

 

Thanks & Regards

 

Asad Azmi

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