At one time, the simple definition of welding was "joining metals through heating them to a molten state and fusing them together." As technical progress in welding processes has advanced, the definition has had to change.

There are now two basic forms of welding: fusion and non-fusion. The former is the most common, and it involves the actual melting of the parent metals being joined. Not all welding today involves melting.

Non-fusion welding is most commonly represented by soldering and brazing, two processes of joining metals where the parent metal is heated, but not melted, and a second or "filler" metal is melted between them, forming a strong bond when all are cooled.

Pressure and friction alone can weld metals together, such as when a machinist turns down a piece of metal in a lathe. Often, pieces of the metal chips can become welded to the cutting tool, which is a simple example of a process that can be used in production work in joining metals.

Other kinds of "cold" welding may today involve sound and light, as in sonic-welding or laserwelding. Today, the term "welding" has even been applied to the processes of joining non-metallic materials, such as plastic-welding which sometimes involves a fusion of materials as a result of heat or chemical action.

As kids, we have all played with plastic models that we constructed using "glues" that would react with and actually "melt together" the two pieces we were joining.

For today's definition of welding to be all-encompassing, it would have to read "the joining of metals and  plastics without the use of fasteners." This definition covers a lot of ground, but, given the interests and needs of the majority of our readers, this book will concentrate on welding as it applies to metals joined by heat processes produced either by a flame or electrical current.

Semantically speaking, throughout this book we will be illustrating and referring to pieces of welding equipment and to the people who operate them. Sometimes the same term "welder" is used to apply to both the machine and the man, which can become confusing, so for our purposes, we will from now on refer to the machine as a "welder" and to the person operating it as a "weldor."

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Unknown said...

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James Franklin said...

MIG welding machines are very popular all over the world. These welding machines use a spool of continuously fed wire to join pieces of metal. If you want to buy the best MIG welder at the best price you can visit the Service Welding Supply website. Miller 211 for sale

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