RE: [MW:5603] NONESSENTIAL OR SUPPLEMETARY

I think this issue has been explained, but I want to try a slightly
different approach.

ASME Section IX looks at welding parameters in basically three ways.

1) those that can have a significant effect on the room
temperature strength and ductility
2) those that have a minor effect on room temperature strength and
ductility
3) those that can have significant effect on impact properties,
e.g. DBTT, absorbed energy, lateral expansion

Group 1 variables are called "essential"
Group 2 variables are called "non-essential"
Group 3 variables are called "supplementary essential"

Group 1 and Group 2 variables apply to ALL welding procedures qualified
under ASME Section IX. The difference is that if Group 1 variables
change outside of the permitted range, a new procedure qualification
test must be performed while Group 2 variables may be changed on the WPS
without requalification.

If impact testing is required by the design Code, then the Group 3
variables are applied and as the name states they are considered
"essential". That again means that requalification is required if the
variables are outside the permitted range. Some variables that do not
have a significant effect on room temperature strength or ductility may
have a significant effect on impact properties. Thus, for those
variables that are marked as both non-essential and supplementary
essential, they could be considered as being promoted to "essential"
status when impact testing is required by the design Code.

The scheme presented in QW-252 thru QW-265 is an intentionally brief
approach to presenting the required welding variables. In order to keep
it as brief as possible one step has been to co-list those variables
that are both group 2 (non-essential) and group 3 (supplementary
essential) on a single line in these tables. It is up to the person
responsible for welding (welding engineer, production engineer, etc.) to
be cognizant the welding requirements, to list the appropriate ranges on
the WPS, and to be aware of whether the variables are essential,
non-essential, or supplementary essential. The Weldors responsibility
is to adhere to the requirements of the WPS as written and, if that
cannot be done, to stop and notify the responsible welding personnel.

Hope this helps. Please let me know if you need further clarification.

John

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Bathula
Raghuram (Mumbai - PIPING)
Sent: Monday, June 14, 2010 11:37 PM
To: 'materials-welding@googlegroups.com'
Subject: RE: [MW:5594] NONESSENTIAL OR SUPPLEMETARY

In general The WPS shall state Non essential variables too, however
requalification is not required {refer QW200.1(b): contents of WPS, it
shall state all types of variables, not only essential, many assume that
only essential variable are required to be stated on WPS, it is not
correct}
For e.g. the variables stated below are required to be stated on WPS
(current/polarity, multi/single pass etc.) in all cases and this range
can be modified depending on your weld geometry, position etc. and no
requalification is required, when impact test are not required.
However same will become essential, when impact test are required and
requalification is necessary, when there is a change on WPS for these
variables..

For e.g. Change in Current/polarity (QW 409.4), if not listed under non
essential, and not specified on WPS, how the welder/operator will know?

I hope, have clarified your point!

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of ali asghari
Sent: Monday, June 14, 2010 9:05 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:5592] NONESSENTIAL OR SUPPLEMETARY

yes , it is true.
but my intention is QW409.4 OR QW410.9 OR QW 410.10 are supplementary&
non essential in same time.if the impact test isn't required, the
supplementary are non essential.why botn of them are marked for the
above variables?
how them used?
regard

On 6/14/10, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com>
wrote:
> Supplementary essential variables shall become mandatory when impact
> testing is required by design. and when there is a change
> requalification is required.
>
> Non Essential variables may be revised on WPS, but requalification is
> not necessary.
>
> ________________________________
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of Ali Asghari
> Sent: Sunday, June 13, 2010 10:46 PM
> To: materials-welding@googlegroups.com
> Subject: [MW:5580] NONESSENTIAL OR SUPPLEMETARY
>
> Dear All
> in QW 250-QW280 in ASME sec IX,SOME VARIABLES ARE NON ESSENTIAL &
> SUPPLEMENTARY IN SAME TIME.e.g in current WHICH ONE SHALL BE
> CONSIDERED?HOW INTERPRETED?
> REGARD ADVANCES

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