Hi
- PQR testing requirements shall be as per ASME Sec IX-QW 140 ( 2017 edition) , other than these all are additional test only. Additional testing on PQR carried out to ensure that production weld suitable for its indeed purpose (like hot temperature, low temperature, corrosive media , urea service etc. etc.. ) based on job requirement.
- During welding /solidification , Formation of delta ferrite phase is not avoidable until you use special filler metal with NIL ferrite. Your final micro structures will have 2 to 8 % ferrite phase. These ferrite levels have significant effect on corrosion, mechanical properties and susceptibility to solidification cracking and other types of material failure. In order to ensure these levels are within range, Ferrite checking is done.
- The need for conducting ferrite measurements on production weldments shall be specified on client only. Pl check the requirements on specifications / material Requisitions / Drawings, ITPs etc.. if client does not specify any requirements , you can ask your testing laboratory to report ferrite values so that it will be useful for your future Projects.
- You may also read more on welding metallurgy aspects of austenitic stainless steel like the micro structure change and effect of cooling rate through Fe-Ni Phase diagram and Schaeffer diagram for understanding purpose
- You may also have " Ferrite Testing procedure " with reference from ASTM E562 for welding procedure qualification. AWS A4.2 for your production welding and get approval. Choose the client approved ferrite testing EQUIPMENT where many fails to meet.
On Sun, Apr 8, 2018 at 7:06 PM, 'Rajnish Dixit' via Materials & Welding <materials-welding@googlegroups.com> wrote:
Dear Prasad,Please review your project requirement. If it is there, you have to test the same.Regards,Rajnish
On Sun, Apr 8, 2018 at 18:41, Prasad Rode<purode333@gmail.com> wrote:Dear sir,--
I am going to do PQR for SA 312 TP 316L pipe to pipe of 6" and 7.11mm thickness.
I want to know that, i have to go for ferrite testing or not ?
If not, when it is essential to ferrite testing?
Regards
Prasad
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