Dear all,

My name is Michael, I'm a newbie, Today I have a question that need your help.

At the moment, I need to make a new part which has Hardfacing overlay. Base material is Nitronic50, hardfacing material is Co-Cr-W alloy, I've choosen Stellite 12.

In the Welding Specification from our customer, there are some requirements after welding, It states:
    ....
    4. ACCEPTANCE CRITERIA REQUIRED FOR WELDING PROCEDURE QUALIFICATION:
    4.1  Deposite chemistry requirements: ...
    4.2 Surface hardness requirements: Hrc 45 minimum
    4.3  Maximun allowable size of indications is as follow:
      - Liquid Penetrant Exam of Weld Overlay - None Allowed
      - Transverse Cross-Sectional Exam at 5X magnification - No linear indications in weld or HAZ

As far as I know:
  " Liquid Penetrant Exam of Weld Overlay - None Allowed " means: I should use Penetrant Method to examine welded overlay. And It should have no flaw/crack ... shown.
    But  " Transverse Cross-Sectional Exam at 5X magnification - No linear indications in weld or HAZ" I really don't  understand what it means.

Can you please tell me what I should do or which standards, specifications I should refer to ( AWS/ASME, .... )

Looking fowards to your help.

Thank you very much,
Best regards,
Michael

They are asking that you cut a sample through the plate and the weld so you can see the cross section of the weld and base metal. Think of it as cutting a piece of cake so you can see the thickness of the frosting and the cake or a piece of pie. You would polish the cross section and etch it with an acid so you can see the weld, HAZ, ad unaffected base metal to check there is fusion to the base metal without underbead cracks, porosity, etc.

Typically you would send the sample out to a metallurgical lab so they could cut, polish, and etch the sample for you. You would provide the lab with the acceptance criteria and they would send you a report. 

Al