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Some information on Welding
by Kenzie Thompson
Welding is used across the globe in some way in nearly every
industry you can imagine. It’s used in industrial settings,
open air environments, underwater and even in outer space.
Welding is used on almost every scale ? by handymen and
structural engineers. And because there are so many uses for
welding, there are also many different types of welding, each
suited to different jobs and purposes. We’re going to take a
look at some of the more popular kinds of welding.
Forge Welding
While not used as much as it was in the 19th century, there is
still a place for forge welding today, especially when creating
high-quality collectible knives and swords. This method of
welding is one of the oldest around and relies on a process of
heating and pounding metal. Forge welding is the craft employed
by blacksmiths of old, making swords, weapons, horseshoes and
many other day to day necessities.
Arc Welding
Arc welding relies on a welding power supply to create an
electric arc between a positively charged electrode and a
negatively charged steel place. The electrical current will
“jump” through the resulting air gap and will create an arc of
enormous heat ? capable of melting metal.
Arc welding is one of the most widely used welding methods
around and has many different secondary branches including:
? AC (Alternating Current) Arc Welding
? DC (Direct Current) Arc Welding
? Gas Metal Arc Welding (GMAW)
? Gas Tungsten Arc Welding (GTAW)
? Submerged Arc Welding (SAW),
? As well as many other specialized methods.
Gas Welding
Unlike arc welding, which relies on electricity, gas welding
uses gas (usually a combustion of acetylene and oxygen) to
produce a welding flame that exceeds temperatures of 3000
degrees Celsius.
Gas welding is one of the planets oldest and most versatile
welding processes, but has gone out of fashion in industrial
applications over the recent years. However, it is still
popular to use when welding pipes and tubing, as well as with
completing some repairs.
Varieties of gas welding methods include:
? Oxyfuel welding
? Air Acetylene Welding
? Oxygen Hydrogen Welding, and
? Pressure Gas Welding.
Resistance Welding
Resistance welding uses the application of an electric current
along with mechanical pressure to create a weld between two
pieces of metal.
This method allows higher speeds, easy automation and is
suitable for high production rates. However, the initial
equipment costs and lower tensile & fatigue strengths temper
out the payoff.
Resistance welding is used heavily in the automotive industry.
Energy Beam Welding
As its name suggests, energy beam welding is a category of
welding which utilizes a beam of such high energy intensity
that it is capable of melting and vaporizing metals. This
process of welding uses electron or laser beams and is very
useful for precision welding, drilling and cutting.
Solid State Welding
Our final category, solid state welding is very similar to
forge welding in that it doesn’t rely on the melting of metal
to work. One of the most popular methods of solid state welding
is ultrasonic welding, a process very similar to resistance
welding, except instead of relying on an electrical current,
vibration is used to create the energy output. Ultrasonic
welding is used for making electrical connections out of
aluminum or copper, and it is also a very common polymer
welding process.
Other popular methods of solid state welding include:
? Explosion welding (relies on the use of incredibly high
pressure and is often used to join two dissimilar materials.)
? Co-extrusion welding
? Cold welding
? Diffusion welding
? Friction welding
? High frequency welding
? Hot pressure welding
? Induction welding, and
? Roll welding.
Between these many different welding methods (and many more we
didn’t identify) we are able to graft metals and other
materials together in such a way that skyscrapers, space
shuttles and automobiles can take shape. But, we can also do
something as intricate as make jewelry. We’ve been welding for
millennia, and we’ll do it for many millennia more.
Kenzie Thompson practices both ornamental and
industrial welding on his 5 acre ranch in Northern California. http://www.weldingadvisor.com
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