Page 14 - Quick Guide to Welding and Weld Inspection by S.E. Hughes, Clifford Matthews

A 10 Minute Guide

SAW has an arc struck between a reel-fed consumable solid
wire electrode and the workpiece. The arc is formed
underneath a layer of flux and is therefore not visible to
the operator. This is a deeply penetrating process requiring
good penetration control. It has very fast deposition rates but
is generally restricted to welding in the flat or horizontal–
vertical positions (otherwise the flux would fall out).
Spend four minutes reading through the welding processes,
noting the differences and making sure you recognise the
acronyms used for each process.
2. Why use welding symbols? (one minute)
Construction drawings need to pass on information clearly
and within a limited space. Welding information is passed on
by a method of conventions and symbols.
Spend one minute looking over the different symbols for butt
welds and fillet welds.
3. What are codes and standards? (one minute)
Construction codes and application standards contain the
rules that must be followed when providing a specific product
or service. They contain information on design, manufactur-
ing method, acceptable materials, workmanship, testing
requirements and acceptable imperfection levels. They do
not contain all the relevant data required for the design,
manufacture, testing and inspection but will reference other
standards and documents as required.
Spend one minute reading the definitions of codes and
standards.
4. What is welding procedure qualification? (one
minute)
Welding procedure qualification is carried out to prove that a
welded joint meets the mechanical, metallurgical and physical
properties required by a code or specification. It also enables
repeatability by encouraging a systematic approach. The

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Woodhead Publishing Ltd – A Quick Guide to Welding and Weld Inspection
Data Standards Ltd, Frome, Somerset – 17/9/200900QG Welding Prelims.3d Page 13 of 14