Page 130 - Quick Guide to Welding and Weld Inspection by S.E. Hughes, Clifford Matthews
P. 130
A Quick Guide to Welding and Weld Inspection
. welding procedure specification for both arc and gas
welding;
. qualification based on tested welding consumables;
. qualification based on previous welding experience;
. qualification by adoption of a standard welding
procedure;
. qualification based on pre-production welding test;
. welding procedure test: arc and gas welding of steels
and arc welding of nickel and nickel alloys.
Procedure qualification record (PQR)
The PQR is a record of the welding data and variables, which
were used to weld a test coupon. It also contains the results of
any NDE and/or mechanical tests carried out on the test
coupon. Different qualification codes have different require-
ments but the PQR will contain, as a minimum, the essential
variables used in the production of the test coupon. In many
cases the non-essential variables will also be recorded, but
this is not necessarily a mandatory requirement.
ASME IX is rather unusual in that it separates the
toughness requirement of a welded joint from the other
mechanical property requirements and assigns it a separate
set of essential variables called supplementary essential
variables, which are only required when impact testing for
toughness is carried out and recorded on the PQR.
Figure 8.1 shows an example blank PQR form which
contains the requirements recommended by ASME IX.
Note that the main procedure qualification codes (BSEN/
ISO) used within Europe have different requirements to the
American (ASME/API) codes and they do not fit well
together. Procedures may have to be separately qualified to
both codes if production welding is specified to comply with
both European and American construction codes.
Welding procedure specification (WPS)
A WPS contains all the information required by the welder
or welding operator to produce a production weld that meets
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Data Standards Ltd, Frome, Somerset – 17/9/200908QG Welding chap8.3d Page 114 of 124
