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PMI to define chemistry composition weld joint after welding!

PMI to define chemistry composition weld joint after welding!

PMI to define chemistry composition weld joint after welding!

(OP)
Dear Sir/Madam!
Thank you for listening my question!
In my shop floor have conducted 1 weld joint as:
Pipe (A672-C60 CL12) + Elbow (A234-WPBW)
Filer metal: ER70S-6 2.4
We conducted PMI for this weld, result as picture
Because Cacbon steel, so when PMI is appeared Fe & Mn composition
I want to know Accept Criteria PMI for this weld (How much percent Mn be accepted?)
As result picture bellow be accepted or not?
At Pipe

At weld

At Elbow

RE: PMI to define chemistry composition weld joint after welding!

You PMI equipment will not provide truly accurate quantitative results. Why are you using it for such a weld? In all my decades of experience with PMI of ASME Codes related carbon steel systems, I have never seen such a requirement. We did use portable spectrographic equipment to asssure appropriate Ni content in weld metal per client on a North Sea gas processing plant.

RE: PMI to define chemistry composition weld joint after welding!

Reference ASME Section II, Part C, SFA-5.18

Table 1 Manganese requirement range for ER70S-6 = 1.40 - 1.85 weight percent.

Also reference ASME Section IX, Table QW-442. ER70S-6 is A-No. 1 weld metal. Maximum Allowable Manganese = 1.60 weight percent.

Manganese percentage is acceptable, per ASME Section IX Specifications.

As weldstan stated, this is an unusual requirement for Carbon Steel. Typically, PMI is not required for these materials.

I would recommend lightly grinding another few small areas around the same weld and see what the results are.

RE: PMI to define chemistry composition weld joint after welding!

One other thing to consider. Industry standard for PMI results is usually accepted for +/- 10%.

You will have to check your customer specifications or your own quality standards to see if this is acceptable.

1.4 * 10% = 0.14 - 1.4 = 1.26%

The devil is in the details; she also wears prada.

RE: PMI to define chemistry composition weld joint after welding!

(OP)
Thank you for your feedback!

RE: PMI to define chemistry composition weld joint after welding!

Do you know what reference standards were used?
Was this done in high precision mode?
Did you also check both of the base materials to see if you get results that match those MTRs?
Do you have heat lot traceability on the filler metal?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: PMI to define chemistry composition weld joint after welding!

No point in carrying out PMI for carbon steel.

DHURJATI SEN
Kolkata, India


RE: PMI to define chemistry composition weld joint after welding!

Unless the project also includes some high alloy (steels or SS) welds I agree with D Sen, no point.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

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