welding basics an introduction to practical and ornamental welding pdf

INTRODUCTION
Welding is a practical skill that is also great fun. The number of welded items in
our everyday lives is practically uncountable—the spot welds on the bodies of
our automobile, the welded railing on our front steps, the superstructure of the
buildings in which we work, and the bridges over which we drive.

But welding
also makes smaller, more delicate functional and decorative items possible, like
patio chairs and trellises, wine racks and candleholders, baker’s shelves and
headboards.

The photos on these pages reveal only a fraction of what welding
artisans have created with heat and metal.

NOTICE TO READERS:
Welding is a dangerous activity.

Failure to follow safety procedures may
result in serious injury or death.

This book provides useful instruction, but we
cannot anticipate all of your working conditions or the characteristics of your
materials and tools.

For safety, you should use caution, care, and good
judgment when following the procedures described in this book. Consider
your own skill level and the instructions and safety precautions associated
with the various tools and materials shown.

The publisher cannot assume
responsibility for any damage to property or injury to persons as a result of
misuse of the information provided.

Introduction to Welding
Welding is all about heat, about using heat to melt separate pieces of metal so
they will flow together and fuse to form a single, seamless piece. Regardless of
the welding or cutting process, your ability to control the heat generated by the
flame or arc determines the quality of your welds and cuts.
Certain terms are used to describe the heat and action of all the welding
processes.

The parts being welded together are referred to as the base metal.
Additional metal, called filler, is often added to the weld. The molten puddle is
the area of melted base metal and filler metal that you maintain as you create
your weld.

To have fusion of metals, the base metal and filler metals must be the
same composition. Methods for joining metal without fusion are called
soldering, brazing, and braze welding.

These methods can be used to join similar
or dissimilar metals.