PMI on Already hot dip galvanized stud and nut

[erjainesh]

dear All,

can anyone share ideas whether PMI can be done on hot dip galvanised bolts or not? or
PMI is required to be carried out before coating?

 

[EdStainless]

Unless you want to strip the galv from spots to test you had better do the testing before.

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P.E. Metallurgy, Plymouth Tube

 

[maxdistortion]

I think you can do it but you have to scratch the galv coating off. Why do you need to PMI bolts? Are they structual bolts or pipe studs?

 

[metengr]

Yes, before galvanizing.