PWHT of Inconel 625 cladding
PWHT of Inconel 625 cladding
(OP)
I am reveiwing a contractor WPS for cladding F65 forging materials with 625 CRA in two layers up to 5 mm thick. Base material qualified is for 25.4 mm upwards. I note that the procedure is qualified with PWHT at 600 to 630 Celcius at one hour per inch - max 3.3 hours.
I am uncomfortable with PWHT of Inconel. Is this common practice when it comes to cladding processes?
I am uncomfortable with PWHT of Inconel. Is this common practice when it comes to cladding processes?





RE: PWHT of Inconel 625 cladding
Cheers
RE: PWHT of Inconel 625 cladding
RE: PWHT of Inconel 625 cladding
RE: PWHT of Inconel 625 cladding
ISO15156-Part 2 “Petroleum and natural gas industries-Materials for use in H2S containing environments in oil & gas production” Clause A.2.1.5, states that welded overlays are acceptable if the maximum hardness of the base metal substrate is below 250HV (22 HRC)
So the client would not be wrong in asking for PWHT if for sour service. Need more details to reply on the same.
Thanks and regards
Sayee Prasad R CEng MWeldI MIOMMM
If it moves, train it...if it doesn't move, calibrate it...if it isn't written down, it never happened!
RE: PWHT of Inconel 625 cladding
RE: PWHT of Inconel 625 cladding
Thanks and regards
Sayee Prasad R CEng MWeldI MIOMMM
If it moves, train it...if it doesn't move, calibrate it...if it isn't written down, it never happened!
RE: PWHT of Inconel 625 cladding
Any commnents
RE: PWHT of Inconel 625 cladding
My comments - as long as you do not contact the P-No 4 (1.25% Cr - 0.5% Mo) base material directly, I see no problem with your repair.
RE: PWHT of Inconel 625 cladding
If this is the case, I would strongly suggest you perform a "temper bead" weld repair to the base material using the Inco 82 filler metal. The elimination of PWHT is permitted for P No-4 material, if you use a temper bead repair method. Simply using an austenitic filler metal with conventional welding does not permit excluding PWHT.
If you have the NBIC (National Board Inspection Code) book handy, I would review Alternative Welding Method 4 for specific guidance.
RE: PWHT of Inconel 625 cladding
Assuming that the repair is to the weld in the P-4 to P-4 joint, is your welding procedure qualified per ASME Section IX or an appropriate NBIC Alternate Method without PWHT? We have qualified a number of procedures for repairs similar to that which you are planning and have achieved a high level of success. Depending on the thichness of the joint, your preheat seems too low. I would also recommend a temper bead technique.
RE: PWHT of Inconel 625 cladding
RE: PWHT of Inconel 625 cladding
RE: PWHT of Inconel 625 cladding
You are right, but than do not allow side bend testing during the qualification tests other wise you can run in a lot of discussions with respect to fitness for purpose.
RE: PWHT of Inconel 625 cladding
In that case, butter with Inconel 82, PWHT and follow with Inconel 625 cladding to assure qualification of bend testing.