Chapter Welding and welding symbols
In general, welding may be described as a process of uniting two pieces of metal or alloy by raising the temperature of the surfaces to be joined so that they become plastic or molten. This may be done with or without the application of pressure and with or without the use of added metal. This definition excludes the more recently developed method of cold-welding, in which pressure alone is used. Cold-welding, however, has a limited application, and is used principally for aluminium and its alloys, and not for steel.
There are numerous methods of welding, but they can be grouped broadly into two categories. Forge welding is the term covering a group of welding processes in which the parts to be joined are ...
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