The requirements for determining the A-number are located in QW-404.5.
There are several options available in this paragraph. I would suggest
that for E7018-1 (There is no designator "I" that I know of) that you
use A-No. 1. This is permitted by QW-404.5 (b) which states that "For
SMAW, GTAW, and PAW (the chemical composition can be determined) from
the chemical analysis of the weld deposit according to the filler
specification or from the chemical composition as reported either in the
filler metal specification or the manufacturers certificate of
compliance."
I believe that the code is concerned with the composition of the
undiluted weld deposit chemistry when the filler metal has an A-no. (See
for example Section II Part C SFA-5.1, 9.3 or Figure 1 which specifies
that the chemical analysis shall be made from undiluted weld metal).
The rational, of course, is that a filler metal of the same A-no. will
result in a deposit chemistry that has similar properties as that of the
PQR test which was, it is assumed, acceptable by mechanical tests.
Changes in other variables may result in changes in the actual deposit
chemistry. However, all other essential variables the same, a simple
change in filler metal with the same A-no. should not result in gross
changes that would affect the mechanical properties reported on the PQR.
From my experience, this is standard practice - you use the A-no.
determined by the specification or based on the filler metal
manufacturers certification. If the filler has no A-number then, per
QW-404.5, you specify a nominal chemical composition, manufacturers
trade designation etc.
john
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of JASPAL SINGH
Sent: Monday, April 27, 2009 2:33 AM
To: Materials & Welding
Subject: [MW:2035] A number in case of Low alloy steel welding with
E-7018 Electrode
I did PQR of Low alloy steel with E-7018-I electrode.
As 'A' number is essential variable.
What should i write over there , because weld metal chemical composition
after dilution will not be A-1.
Regards
Jaspal Singh
9996624244
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