CASE
STUDY #4 - Welding Procedure Specification
“We have a requirement to weld a rolled,
quench and tempered high strength steel. Are you
able to prepare a preliminary welding procedure specification
so that we can qualify the welding procedure to BS
EN ISO 15614 requirements”.
By using the technical knowledge, experience and competence
of our International/European Welding Engineer, a preliminary
welding procedure specification (pWPS) was prepared
and included a number of important technical aspects
such as heat input and inter-pass temperature requirements,
the selection of a suitable welding consumable make
and classification, specification of appropriate joint
design details, preheat, welding current type along
with other technical aspects, the pWPS was sent to
the client for use on the weld test.
A subsequent weld test was carried out by the client
at a distant location and the welding procedure test
piece unfortunately failed to meet the requirements
of the standard on tensile testing. The results showed
the weld metal tensile strength was below that of the
parent material.
The client asked us for our view on why this had happened
and on conducting an investigation and by reviewing
the consumable certification of the welding electrode
that was actually used during the test, showed that
a substitute welding electrode classification had been
used to that originally specified by Weld-Class Solutions
which was under matched to the parent material – and
the non conformance was therefore established.
The client informed Weld-Class-Solutions Ltd that the
substitute welding electrode was recommended by their
welding consumable supplier as a suitable alternative
to the original. A second welding procedure was tested
using the original specified consumable classification
and the welding procedure test exceeded all of the requirements
of the test standard.
Read more
about our specialist welding and welder qualification testing consultancy
services.
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