When the WPS does not specify any chemical composition for overlay, the welder for such overlay can be qualified in a groove weld performance qualification. If your welder qualified for CRO through this route, he can make fillets too. Otherwise, if he qualified on a cladding coupon, he can make...
Something similar happened at my workplace. Contract specified that: The equipment shall be manufactured conforming to ASME Section III NB. Some members in customer team felt that this automatically implies that all raw material & welding material should only be procured from ASME certified...
@wdavischris, variations of this question are bound to arise. There is nothing in Section IX to prevent this. A welder qualified on a 1 mm thick groove weld coupon IS qualified to make all fillet sizes, on all base metal thicknesses, and on all pipe diameters. But like david339933 says, this...
@fleischfresser, nice reply. One observation though. If you notice, there is no 'welding supervised by' column on the PQR form (it is there on WPQ forms). This is strange.
Over past three years, Sec IX has strenuously communicated that both PQR and WPQ coupons must be made under the full...
@louis lac, a PQR qualified without toughness cannot be used for a weld with toughness, regardless of whether the coupon/job is a fillet weld or a groove weld.
DekDee,i think you posted something and deleted it (i wonder why). Yeah, i own mewelding.com. I am a Sec IX enthusiast. Ever since i discovered Interpretations, i have been enamored by them.
It does look like Mr Houle's thinking needs further corroboration (or refusal) from ASME IX committee...
1. The qualified base metal thickness would be 8.18 mm to unlimited. [assuming the 8.18 mm dimension in your question is the thickness of the plate).
2. The qualified cladding thickness would be 5 mm minimum (assuming the actual cladding thickness in coupon is 5 mm). There is no upper limit for...
r6155, the latest one.
Shane, you make a good point. I subscribed to this thinking too for 9 out of my 10 years experience. Then i chanced upon the CASTi book, which it must be said - is a treasure trove. It is hard to ignore the reasoning of the gentleman, at least from the Sec IX standpoint...
weldstan, true, one must always be awake to other considerations such as metallurgical, mechanical etc. (and not rely on code alone) when deciding upon the preheat. Here, though, we are only grappling with how to read QW-406.1 correctly.
Dekdee, you might be right. But i am inclined to give...
Mr Jones, thanks for reply. Well, it is clear that this thinking meets opposition frequently, like it did here. And one wants validation of one's thinking. I came here seeking to know opinion of learned people on the subjects that are controversial at my office.
And sure, i think a rewording...
Cool. This brings us to the reason why i started the thread in the first place.
I am familiar with both interpretations. To a layman, QW-406.1 can mean nothing else other than the understanding you have espoused in above posts, as well as the understanding that seemingly flows from these two...
Shane, I don't think you want to see the point i am trying to make. I am gonna try one more time:
1. CASTI book was published around 1995. But i don't see how that affects anything. The definition of preheat temperature has stayed same since before that.
2. Interpass temp def under QG-109 is...
The contractor is wrong.
Although latest edition of Section IX has removed the requirement of the welder making the procedure qualification test coupon to be an employee of the qualifying organization, he must still be under full supervision and control of the qualifying organization (meaning...
Good point. Sec IX defines preheat temperature as follows:
'The minimum temperature in the weld joint preparation immediately prior to the welding; or in the case of multiple pass welds, the minimum temperature in the section of the previously deposited weld metal, immediately prior to...
Hello, if someone has relevant experience with Section III NB, please help with the following issue:
NB 2431.1(c) specifies that the preheat, inter-pass, and PWHT temperatures to be adopted for preparation of test coupon for Lot Qualification of welding material are required to be same as the...
Dekdee, respectfully, I disagree with you again.
Maybe this will change your mind. See the attachment. This is from CASTI handbook, written by one Michael Houle, who was on Section IX committee for 40 years.
If you have qualified a PQR with preheat of 100°C, you cannot specify 45°C on the...
DekDee
I am familiar with Walter Sperko. His articles are a goldmine.
The problem is that interpretations are frequently used as a credible tool to establish an understanding, at my workplace. But doubting customers keep going - 'how do i know this interpretation is currently valid or not?'
I...
I agree @DekDee. No problem with having a welder who was qualified on P1 to weld on P3. This is permitted by QW-423.
I was only pointing to your use of 'you can ignore the essential variables of QW-250'. One cannot ignore QW-250, right? The first few lines of QW-300 say that only a qualified...
@DekDee, thanks for your response. Although, i have to disagree with you a bit. You are right that PQR should show 150°C as the preheat; however, it is not Section IX's intent that in the case cited above, WPS can specify a preheat of 95°C. This is not how QW-406.1 is intended to be used.
The...
