qualified base metal thickness
qualified base metal thickness
(OP)
FCAW P1 material to P1.
I will be welding a 3/8" thick lift lug (CJP) onto the side of a 2" plate (TEE JOINT).
We have a WPS qualified in a range of 1/4" to 1/2" base metal, can I use this procedure on this joint and if so where in the code may I find this answer?
Which thickness takes precedence over the other?
Thank you,
I will be welding a 3/8" thick lift lug (CJP) onto the side of a 2" plate (TEE JOINT).
We have a WPS qualified in a range of 1/4" to 1/2" base metal, can I use this procedure on this joint and if so where in the code may I find this answer?
Which thickness takes precedence over the other?
Thank you,





RE: qualified base metal thickness
You say a tee joint. Are you making a fillet weld only or, does it call for a groove weld with a fillet on top?
Assuming your previously qualified WPS is for groove welds and all other essential variables are adhered to and, if you're making just fillet welds, you may use your existing WPS to support this work. I'm basing my response on QW 202.2(c)
RE: qualified base metal thickness
I said, 'you may use your existing WPS to support this work' but I should have said you can use your existing PQR to support this work. Depending on how it is written, you may need to revise your existing WPS, or create a new one.
RE: qualified base metal thickness
Is my concern with the 3/8" material thickness or the 2" thick material that the lug attaches to??
Thanks
RE: qualified base metal thickness
RE: qualified base metal thickness
Where may I find the supporting text in ASME sec IX Code?
Thank you
RE: qualified base metal thickness
(b) Qualification for Partial Penetration Groove Welds.
Partial penetration groove welds shall be qualified in accordance
with the requirements of QW-451 for both base
metal and deposited weld metal thickness,except there
need be no upper limit on the base metal thickness provided
qualification was made on base metal having a thickness
of 1-1/2 in. (38 mm) or more.
RE: qualified base metal thickness
QW-202.4 Dissimilar Base Metal Thicknesses.
WPS
qualified on groove welds shall be applicable for production
welds between dissimilar base metal thicknesses provided:
(a) the thickness of the thinner member shall be within
the range permitted by QW-451
(b) the thickness of the thicker member shall be as
follows:
(1) For P-No. 8, P-No. 41, P-No. 42, P-No. 43, PNo.
44, P-No. 45, P-No. 46, P-No. 49, P-No. 51, P-No.
52, P-No. 53, P-No. 61, and P-No. 62 metal, there shall
be no limitation on the maximum thickness of the thicker
production member in joints of similar P-Number materials
provided qualification was made on base metal having a
thickness of 1⁄4 in. (6 mm) or greater.
(2) For all other metal, the thickness of the thicker
member shall be within the range permitted by QW-451,
except there need be no limitation on the maximum thickness
of the thicker production member provided qualification
was made on base metal having a thickness of 11⁄2 in.
(38 mm) or more.
More than one procedure qualification may be required
to qualify for some dissimilar thickness combinations.
Hope that helps,
Cheers,
DD
RE: qualified base metal thickness
Why not weld a 3/8" reinforcing pad to the 2" plate and then weld the lug to it....everybody wins.
RE: qualified base metal thickness
I respectfully disagree.
Here are a couple of interpretations
Interpretation: IX-86-89
Subject: Section IX, QW-202.4
Date Issued: June 2, 1988
File: BC88-O89
Question: When employing a groove-weld WPS to join flat plates of dissimilar thickness in a
corner joint, is it a requirement of QW-202.4 that both the thicker and thinner members must be
qualified within the range permitted by QW-451 unless the alternative provided in QW-202.4 is used?
Reply: Yes.
Interpretation: IX-95-12
Subject: Section IX, QW-202.4, Dissimilar Base Metal Thicknesses
Date Issued: March 17, 1995
File: IX-95-12, IX-95-13, IX-95-14
Question: Does QW-202.4 include butt joints and corner joints when joining dissimilar base metal
thicknesses when prepared with a groove?
Reply: Yes.
Interpretation: 1X-98-20
Subject: QW-202.4(b), Dissimilar Base Metal Thickness
Date Issued: June 8, 2000
File: BC99-539
Question: When welding a corner joint with dissimilar base metal thickness, the thickness of both
members must be within the qualified thickness range of the WPS(s) being used. How is the thickness
for the thicker member defined in sketches (a), (b), and (c) below?
I was unable to post the diagrams but the intent of the code is quite clear - both members of a corner joint must be within the required thicknesses,
Regards,
DD
RE: qualified base metal thickness
RE: qualified base metal thickness
If I weld a 1" (25 mm) plate at right angles on the end of a 4"(100 mm) plate with a single bevel or double bevel it is classed as a corner joint.
If I move the 1" member away from the end of the 4" member it then becomes a Tee joint.
What is the difference between the two when it comes to the relationship between the thinner member and the thicker member ? - nothing !
The clause I noted above ( QW 202.4) states groove welds - a groove weld can be a corner joint or Tee joint.
The OP requires a groove weld (whether it is a corner or tee joint) between 3/8" and 2" material and therefore must comply with the requirements of QW 202.4
Regards,
DD
RE: qualified base metal thickness
I think a closer interpretation would be here (IX-80-67)
Link
The governing thickness would be the 3/8", "set-on" the shell.
RE: qualified base metal thickness
The interpretation you have posted clearly states both base metal thicknesses must be qualified.
ATTENTION
The foregoing Interpretation has been further considered, and the following corrected Interpretation sent to the inquirer.
Correction Issued: March 12, 1981
Question: When nozzle or branch connections are attached to the wall or head of a pressure vessel, what are the basic criteria establishing procedure and performance qualification?
Reply: For groove weld procedure qualification, the base metal thickness range for all base metals being joined in addition to the deposited weld metal thickness range for each process used must be qualified in accordance with QW-451 (see QW-202.4). Also, see exemptions in QW-202 for fillet weld procedure qualifications.
Regards,
DD
RE: qualified base metal thickness