doing weld build up requires groove weld WPS and hence it needs to be qualified by groove weld specimen not the hard facing.
You are applying the hard-facing on top of build up material which requires a separate qualification of hard-facing as the base material here it is treated as unlisted...
Dear Experts,
It is very strange that one of the small bore flange made of Inconel 625 forged (ASTM B564 UNS 6625) got a through thickness crack just near the tapering portion of a flange. The crack was noticed while performing the hydrostatic test. The thickness at the bevel end is 5 mm and...
Ductility could be one of the reason. This limit may be set to effective utilize the grade within the required properties. The same range can be seen in PSL 2of API 5L materials whereas PSL 1 which is least stringent doesn't have such maximum range.
As the name of the pass reflects the importance, The first pass is the root of your joint to keep them strength enough and it is directly experiencing the medium shocks and stress.
Ideally visual inspection cannot be substituted by RT as there are lot more indications can be found by VT which...
As the name of the pass reflects the importance, The first pass is the root of your joint to keep them strength enough and it is directly experiencing the medium shocks and stress.
Ideally visual inspection cannot be substituted by RT as there are lot more indications can be found by VT which...
But it is contradictory to the statement mentioned in QW-405.4
if it is really required to have three samples minimum at different locations of QW 462.5(b), then it is better to perform PQR on a plate of similar P number utilizing uphill position of 3G which will qualify all position and dia is...
A bit more clarity of "Gtaw" reply.
if you want to combine two PQRs and wanted the benefit of higher thickness range of cover pass PQR, then the PQR used for root welding shall be at least qualified on 1/2 inch thick plate/pipe. if it is less than 1/2 inch, still it can be combined with any...
Dear Experts,
A CRO (Corrosion resistant weld overlay) PQR is done on pipe in 5G position. Chemical analysis is to be done as part of the PQR and as per ASME Sec IX Figure QW-462.5(b), for 5G and 6G position the locations are mentioned for chemical analysis. However there is a note states...
Thanks DVWE and DEkDee,
But the original question remains unsolved. This interpretation is all about the butt weld with root. my point is why code has restricted or require re qualification even if I weld fillet weld or just fill and capping on groove weld without purging gas in fact there is no...
my apology for wrongly interpreted....but for P NO.4X 941, 42, 43 ETC....), code states for groove weld only..whereas p no.10I all welds mentioned in the same clause
thanks for the swift resonse DVWE.
But the interpretation is related to PNO.4 whereas QW 408.9 specific to P 10I for all welds and to P no.43 for groove weld.
Dear Experts,
QW-408.9 states For groove welds in P‐No. 41 through P‐No. 49 and all welds of P‐No. 10I, P‐No. 10J, P‐No. 10K, P‐No. 51 through P‐No. 53, and P‐No. 61 through P‐No. 62 metals, the deletion of backing gas....is an essential variable for GTAW process.
The point I am getting...
ASME Sec V Article 4 T-421, change of thickness(without specifying the range) is considered as essential variables which require re-qualification.
1. Does it mean a change of thickness even if it is 1 mm require re-qualification?.
2. How will we qualify UT procedure. is there any separate...
The acceptance criteria is mentioned in QW 194. However the construction code visual inspection acceptance criteria to be fulfilled in addition(recommendation only)
Dear Experts,
The three specimens from the HAZ side are tested found two values are less than minimum value permitted for single specimen whereas the average of the three specimens exceeds the average value required.
Am I allowed to go for retest?.
The code retest criteria is "when the...
Yes you are right. for performance qualification variables, QW-381 states to refer QW-350/360 (general essential variables) to be followed.
A point to correct that though F number is not an essential variable for WPS, A number becomes essential variable for CRO which is almost equivalent to...
Hi All,
Client specification calls for post weld baking/heating (not stated as PWHT) of a P No.1 material after welding for a specific reason. Does it consider a PWHT condition as per ASME Sec IX QW-407.1(a) Point#2, i.e PWHT below lower transformation temperature?
If it is considered as PWHT...
