WELDING THEORY - OD1650 - LESSON 1/TASK 1
TASK 1. Interpret welding symbols and describe the use of welding symbols on shop drawings.
Within a self-study environment and given the subcourse text, without assistance.
Within five hours
No supplementary references are needed for this task.
Welding is one of the most important functions performed within a metalworking shop. Many
broken parts may be welded and put back into service, saving the expense of fabricating or
purchasing a new piece of equipment, and downtime is reduced. This task will describe the
welding process, to include the interpretation and identification of welding symbols used in shop
General. A master chart indicating the great variety of welding processes is shown in
figure 1 on the following page. The term "welding process" means heating metal parts to a
temperature high enough to join the metal parts by coalescence. Welding is done with or without
the use of pressure, by the pressure alone, and with or without the use of filler metal.
Coalescence means the growing together, or growth into one body, of the base metal parts.
There are two basic requirements for coalescence: heat and intimacy of contact.