Direct current straight polarity (DCSP): Arc heating when the
workpiece is positive and the welding electrode is negative.
Also called as dc electrode negative (EN) or dc-.
Direct current reverse polarity (DCRP): Arc heating when the
workpiece is negative and the welding electrode is positive.
Also called as dc electrode positive (EP) or dc+.
AC mode: One-half of the voltage cycle operates as dc-/DCSP,
while the other half operates as dc+/DCRP.
The AWS multi-volume Welding Handbook is a comprehensive treatment of
the art and technology of welding [AWS].
It includes:
Volume 1 – Fundamentals of Welding
Volumes 2 and 3 – Welding Processes
Volume 4 – Engineering Applications – Materials
Volume 5 – Engineering Applications – Design
The welding of structural (non-pressure boundary) members typically
complies with either AWS D l.l or AWS D1.6. The American Welding
Society
(AWS) standards of interest to welding piping and pipelines include:
AWS A 3.0 – Welding terms and definitions, including terms for brazing, soldering,
thermal spraying and thermal cutting.
AWS A 5.01 – Filler metal procurement guidelines.
AWS A 5.XX – Series of filler metal specifications.
Protective screens
Persons adjacent to welding and cutting must be
protected from radiation and hot spatter by flame
resistant shields or screens with suitable eye and face
protection clothing.
Wall reflectivity
Where arc welding or cutting is regularly carried out
adjacent to painted walls, the walls should be painted
with low reflective pigments for UV radiation such as
Titanium dioxide or Zinc oxide.
Fire
Open flames, electric arcs, spatter, hot metal and sparks
are the potential fire igniting elements related to
welding.
The risk of fire is greatly increased by combustible floor,
partitions, ceiling etc and also by the presence of
combustibles in the working area such as wood, paper,
trash, cotton, textiles, chemicals, paints, and flammable
liquids and gases. For outdoor, dry grass and brushes
highly ignite potential to welding.
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