ASME Sect IX-2010-QW-405

Date 03-25-2014 08:52

Dear Experts

Position only a Supplementary essential variable (ie when CVN-Impact test required).

QW-405.2 A change from any position to the vertical position uphill progression. Vertical‐uphill progression
(e.g., 3G, 5G, or 6G position) qualifies for all positions. In uphill progression, a change from stringer bead to weave
bead. This variable does not apply when aWPS is qualified with a PWHT above the upper transformation temperature
or when an austenitic material is solution annealed after welding.

QW-405.4 (a) Qualification in the horizontal, vertical, or overhead position shall also qualify for the flat position. Qualification
in the horizontal fixed position, 5G, shall qualify for the flat, vertical, and overhead positions. Qualification in
the horizontal, vertical, and overhead positions shall qualify for all positions. Qualification in the inclined fixed position,
6G, shall qualify for all positions.

I'm looking at some of the WPS/PQRs received from Vendor.
PQR state that Position Tested/Qualified- 1G
WPS state qualified for all groove and fillet positions?
CVN Tested at -30 deg C.

Based on QW-405.2 & QW-405.4- 1G does not qualify all positions.Only qualified for 1G & 1F.

Plls explain how "This variable does not apply when aWPS is qualified with a PWHT above the upper transformation temperature
or when an austenitic material is solution annealed after welding." relevant to Positions.

Pls shine some light on this. Thank You.

By js55

Date 03-25-2014 12:05

Nalla,
Because the microstructure completely changes above the upper transformation temperature. Whatever was done in welding is gone. The Code recognizes this metallurgical reality and allows an exception to the variable because of it.
The same is true of annealing SS.

By Jovi Zhu (**)

Date 03-25-2014 13:03 Edited 03-29-2014 14:01

Nalla,

You need to go to Table QW-25X for your specific welding process, ie SMAW, GMAW, FCAW, GTAW, etc.

QW-405.2 is listed for SMAW, GMAW, FCAW, GTAW... as supplementary essential variable, as you mentioned when CVN impact test (for toughness) is required.

Compared with other position/progression, vertical-uphill progression gives relatively high heat input hence produce lower impact toughness of the joint. This is the reason why vertical‐uphill progression (e.g., 3G, 5G, or 6G position) qualifies for all positions but a change from any position to the vertical position uphill progression requires the requalification of the procedure. In uphill progression, a change from stringer bead to weave bead will result in a lower travel speed, hence increase the heat input.

So...1G PQR does not qualify for all positions as per QW-405.2.

When PWHT above the upper transformation temperature (re-austeniting) is done for ferritic steels or when an austenitic material is solution annealed after welding, the effect on impact toughness due to welding heat input is eliminated and the final impact toughness of the joint depends on the PWHT/solution annealing parameter. Hence this variable, QW-405.2 for welding position does not necessarily apply.

:roll:

I am wondering why you mentioned QW-405.4. This variable is listed in Table QW-25X.1 as essential variable for special processes (hard-facing or corrosion-resistant overlay). The welding position will affect the final hardness (wear-resisting ability) of the hard-facing overlay or the chemical composition (the anti-corrosion ability) of the corrosion-resistant overlay.

Your WPS is not for overlay welding I assume, since you indicated impact toughness~ so you do not need to consider this variable as essential.

Hope the above can be of help.

Jovi

By Nalla

Date 03-25-2014 23:48

Yes
QW-405.4 not relevant to my question.
Thanks for explanation

By muziyu Date 03-26-2014 02:39

jovi,

your help is very good!

not only give a excellent answer,but tell us why ！

best regards！

By Nalla

Date 04-02-2014 01:05 Edited 04-02-2014 01:07

Dear Jovi and Other Experts

If have pls send ASME IX -Interpretation IX-81-24.

When applying QW-405.2-Maybe little confusing-Pls advise if below statements are correct understanding
1 - Any position not involving the vertical uphill progression will qualify for all positions, except those involving the vertical uphill progression.
2 - Any position involving the vertical uphill progression win qualify for all positions, including those involving the vertical uphill progression.
3 - For example, qualification on a test coupon in the 2G position will qualify 4G and 5G downhill, but not 3G uphill.
4 - Qualification on a test coupon in 3G uphill progression will qualify 4G, 6G uphill progression, and all other positions.

Appreciate all contributions. Thanks

By Jovi Zhu (**)

Date 04-03-2014 14:28

Nalla,

I'm afraid that you just confused "test positions, e.g. 1G, 2G, 3G..." with "welding positions, e.g. Flat, Horizontal, Vertical, Overhead.".

By Nalla

Date 04-07-2014 17:40

Jovi
Sorry, can you pls elaborate
2G Test Position-2G = Weld position - Horizontal
1G Test Position-1G = Weld Position - Flat
3G-Vert-Up Test Position -= Weld Position - Vertical-Up-hill
4G Test Position = Weld Position - Overhead

By Jovi Zhu (**)

Date 04-08-2014 03:15

Nalla,
IMHO,
Test positions 1G, 2G, 3G, 4G, 1F, 2F, etc. are standardized for qualification test of procedure, welding operator or welders. They are defined by Figure QW-461.3,4,5,6,7.
Weld positions F, H, V, O, etc. are the actual positions you encounter in the field or on the shop floor. They are defined by Figure QW-461.1,2,8.

Test position is like the standard car you drive during your driving licence examination. And after you pass the examination and get your licence, you are "qualified" to drive the actual cars (like the weld positions) BMW, Ford, Toyota, .....

You can not say the test position = the weld position.

Hope this humble explanation of mine would help out~

Jovi

By nantong (**)

Date 04-13-2014 02:29

Nalla JS 55 gave you the succinct answer in ca. 40 brief words. That is how answers should be given.