Forum Replies Created
-
Posts
-
DG,
Code is correct as written.
Fit-ups are not always perfect so that is why the code has tolerances.
If you are using backing material it is quite easy to weld a 10.5 mm gap – it is not ideal but the code allows you to if required.
Regards,
BBThe other possibility is that it is intentionally a PJP to get away from having to UT/RT or even having to backgouge.
Hypothetically, a SAW weld from both sides should be able to achieve 18 mm depth of penetration (on a 16 mm prep) without backgouging so you will end up with a CJP but because it is classified as a PJP it does not require volumetric testing.
Hope I have made sense,
Cheers,
BBPS. Flash, have sent a couple of e-mails to admin@weldingflash.com.au but have had no response – did you receive them ?
IG,
Firstly, trying to explain the reasoning behind AS/NZS 1554 is a challenge in itself.
Any code / standard that is 106 pages long and needs a 100 page commentary (WTIA Tech Note 11) to explain it has got to be a mission.In answer to your question.
When a welder qualifies to AS/NZS 1554 for Employer A he is only qualified to work for Employer A. If he leaves and goes to Employer B his qualification becomes null and void and he must requalify for Employer B.
If a welder arrives at Employer A with AS 1796 or AS 2980 certification (as examples) he is automatically qualified to weld to AS/NZS 1554 (within the essential variables of their original qualification) Simplest way to explain it is they are basically given a “temporary” qualification to weld in accordance with AS/NZS 1554.
If he then leaves and goes to Employer B the process is again repeated, no need to requalify as he is covered by his original “certification”.
Hope that clarifies,
Regards,
BBHey Flash / winnyreds,
I realise this is a very old post but thought if I answer it it may assist someone else in the future.
NZS 4711 (if my memory serves me correctly – I did it over 25 years ago) is IMHO actually tougher than AS 2980.
It is a transferrable certification that is issued to the welder on successful completion of his tests.
4 x 12 mm test plates (Flat, vertical, horizontal and overhead)
300 mm long
150 mm x radiographed, 2 x nick breaks and 1 x bendNZS 4711 is referenced in AS/NZS 1554 Pt 1 (4.12.2 (a) and is deemed equivalent to AS 2980 so just take a photocopy of that page with your quals and it may assist prospective employers who don’t recognise that code,
Cheers,
BBHi Kav,
Looks like you have got everything under control.
Just remember there is a slight difference in thickness limitations on impact tested steel between ASME IX and B31.3 – clients love picking it up during review.
Regards,
BBKav,
Sorry for late reply but have a quiet day and trawling through old postings.
Flash is correct – to comply with B31.3 you should have performed 3 x WM, 3 x HAZ (A333) and 3 x HAZ (LF2)
Have a look at Table 323.3.1 in B31.3,
Regards,
BBKav,
As Flash has stated forget about diameter when you are qualifying welding procedures. Only comes into play for Welder Qualifications.
What grade of SA 333 are you using ? (there are 8 grades)
What fabrication code are you working to ? (I’m presuming B31.3 for ASME and AS 4041 for Australian)
Are impacts required ? If so the goal posts change significantly.
A bit more info and we can probably assist more,
Regards,
BBGuys,
Found this in the draft of AS/NZS 1554.5 2008.
Now keep in mind the clauses for welder qualification in Part 1 and Part 5 were exactly the same in the 2004 versions of both.4.12.2.4 Reapproval
Reapproval shall be required if any of the following conditions apply:
(a) Six months or more have elapsed since the welder was employed on the relevant
welding processes.
(b) For other than welders qualified to AS/NZS 2980, NZS 4711 or ISO 9606 1, the
welder changes employment. Under such circumstances, the new employer shall
qualify the welder who has changed employment.Clause (b) has been added but no reference to AS 1796 or AS/NZS 3992 as found in 4.12.2.2 below
4.12.2.2 Qualification via Standards
Qualifications obtained by welders under appropriate Standards laying down welder
qualification tests are acceptable as evidence of their ability. Such evidence shall refer to
welding carried out on joints and in positions as close as practicable to the actual joints and
positions to be used in construction. Welders qualified to Standards such as AS 1796,
AS/NZS 2980, AS/NZS 3992, NZS 4711 or ISO 9606-1 shall be deemed to be qualifiedNot sure why they are omitted ?
Regards,
BBHi Kav,
See below from B31.3328.2.1 Qualification Requirements
(a) Qualification of the welding procedures to be used
and of the performance of welders and welding operators
shall conform to the requirements of the BPV Code,
Section IX except as modified herein…..”Cheers,
BBHi Flash,
Where in AS 1554 does it say that 1G only covers 2G and 4G, I can’t find it anywhere ?.
I agree with your statement about the code being a minimum only. WTIA Tech Note 11 states that it is recommended that fabricators perform tests on coupons as close as possible to those being used in production. They even agree with what Ron has said about using a Flat WPS for Overhead welding, it is not really applicable. The code may allow 1 test to cover all positions but it is recommended that you qualify as many positions as necessary to cover all applications.
What is really confusing is Section 4.1.2 (b) states that any procedure qualification for any prequalified joint shall qualify all other positions listed for that joint without further testing.
Then you have Table 4.11 (A) (k) which states that a change in welding position is an essential variable and therefore a change requires requalification ???
Cheers,
BBHi Flash,
My take on the question is a bit different.
AS/NZS 1554 Part 1 Clause 4.12.2 (a) states “Welders qualified to standards such as …………AS/NZS 3992……. shall be deemed to be qualified.”
Does that not mean that an AS/NZS 3992 qualified welder can weld to any AS/NZS 1554 WPS as long as he stays within the range of his qualification ?
Regards,
BBHi Ron,
Will try and answer as best I can.
1 Bend tests for WPS qualification are generally not looking for weld defects, they are checking the weld joint ductility. If a defect is not at the surface or very near the surface it will not be exposed after bending , that is where the macro comes in – identifying internal defects.
Remember – Destructive tests for Procedure qualification (bends, tensiles, impacts, hardness etc) are used to determine the mechanical / metallurgical properties of the weld. With a lot of codes you RT/UT the coupon first so you can find “clean” areas to take your samples from.2 Higher tensile steels generally exhibit lower ductility so the former size increases as the tensile strength goes up.
3 AWS D1.1 allows the same, you can write up a WPS without any testing (no macro). No idea why AS/NZS 1554 requires it and other codes don’t.
4 At present there are approx 332 holders of AS 1796 and 339 holders of AS 2214 (not sure how many of these people hold both). Not sure if you mean experience as a Welder or Supervisor ? In contrast to Welding Inspection qualifications the Welding Supervisor must have a pretty comprehensive history as a welder before being able to sit the examination.
Hope that helps,
Regards,
BB
