Base Metal Thickness Range
Base Metal Thickness Range
(OP)
I am preparing a new WPS and PQR for P1 materials using GMAW with impact testing. These are prepared in accordance with ASME Sec.IX.
My question concerns the base metal thickness range qualified. I would like to use the same procedure and PQR to qualify material that is 0.154" thick up to 1" thick or more.
From what i have read, this will not be possible.
If I am correct in this conclusion, can I use two PQRs to increase the range qualified on the WPS?
How do I determine if I use the minimum thickness values of QW-403.6 or QW-451.1?
My question concerns the base metal thickness range qualified. I would like to use the same procedure and PQR to qualify material that is 0.154" thick up to 1" thick or more.
From what i have read, this will not be possible.
If I am correct in this conclusion, can I use two PQRs to increase the range qualified on the WPS?
How do I determine if I use the minimum thickness values of QW-403.6 or QW-451.1?





RE: Base Metal Thickness Range
If any of those cannot apply, then yes, you are correct, two PQRs will be required for your required range of thickness - see QW-200.2(f). QW-403.6 only affects the minimum range of thickness, not the maximum. You still have to use QW-451 to determine your maximum.
UG-84(c)(5)(b) will guide you for your subsize specimens. Probably not a bad idea to read UG-84 too.
RE: Base Metal Thickness Range
RE: Base Metal Thickness Range
Yes.
Yes.
RE: Base Metal Thickness Range
For this procedure, we are looking to qualify P.1 Grp.1 material to P.1 Grp.2 material.
SA-516 Gr.70 is the P.1 Grp.2 material we will most likely use.
Can we use SA36/CSA G40.21 Gr.44W as the P.1 Grp.1 material even though it is not impact tested and we will be doing impact testing on the welds?
RE: Base Metal Thickness Range
I'm not so sure I understand that question. Doing a P-No.1 Grp. 1 to P-No.1 Grp. 2 is quite common. But that includes impact testing of both HAZs and the Weld Metal. So you should impact test the P-No.1 Grp. 1 also. As you may know, this will qualify welding to themselves as well as each other (QW-403.5).
RE: Base Metal Thickness Range
I understand that the HAZs and the weld metal will be impact tested. SA516 Gr.70N is an impacted tested material. SA36/CSA G40.21 Gr.44W is not.
I would like to know if this matters or not for the qualification.
But i just realized that i could also use SA-516 Gr.55, 60 or 65 for the P-No.1 Grp. 1 material. I am able to get that with impact tests if required.
Does this make sense?
RE: Base Metal Thickness Range
For the qualification it doesn't. But read through UG-84(h)(2).
SA-36 can be ordered with impact testing as an option with the supplementary requirement, similar to SA-516.
RE: Base Metal Thickness Range
RE: Base Metal Thickness Range
RE: Base Metal Thickness Range
RE: Base Metal Thickness Range
If you like to know more about this topic, you can download an article called "The Impact Testing Enigma AB-511" from www.absa.ca.
The full story....
Good Luck,
Hugo
RE: Base Metal Thickness Range
Since the ASME Code recognizes that heat input can be deleterious to notch toughness, and those negative effects are greater on thinner materials, many fabricators qualify a procedure with two test assemblies as follows;
1. a thick plate with bends and tensiles only
2. a thin plate with impacts only.
Eg. a 1" plate with bends and tensiles gets you covered up to 2". Combined with a test assembly that is 3/16" thick tested for impacts only, will give you a qualified range of 3/32" - 2".
All essential and supplementary essentail variables must be identical. Heat input is key. Amongst other paragraphs review QW403.6
RE: Base Metal Thickness Range
The thinner plate is impact tested because it has the greater chance of not qualifying? If it meets the requirements, it is assumed the thicker plate will also meet the requirements?
The maximum thickness qualified by the 3/16" thick plate would be 3/8". The minimum thickness qualified by the 1" thick plate would be 5/8". Using two test assemblies with these thicknesses, is the range inbetween the maximum qualified thickness of the thinner plates and the minimum qualified thickness of the thicker plates also qualified?
RE: Base Metal Thickness Range
No, because you have impact tested only.
No, because you have not impact tested.
QW-401.3 addresses this way of doing it as weldtek has suggested.
RE: Base Metal Thickness Range
RE: Base Metal Thickness Range
Yes.