What Is Welding? | Welding

What Is Welding? | Welding


What is welding? Welding is distinct from other processes that
we use to join metal, such as soldering and braising, in which a third material is added
as a kind of glue. With welding, we take two distinct materials,
two distinct objects. Through the addition of heat we create a molten
pool of metal into which we add a filler rod. The resulting product is no longer two distinct
pieces, but one homogenous unit. This piece of material can now then be cut,
bent, or manipulated in any way that one would wish. It’s not like you’ve added a third material
that needs to be treated differently. There are different kinds of welding. We use gas, acetylene and oxygen, as a heat
source. Mig welding, arc welding, and tig welding,
which all use an electrical source to create heat. But even though each of these are different
and have their own distinct qualities, they’re all essentially doing the same thing, that
is taking two distinct pieces of material and joining them into one. I want to demonstrate the welding process
using an oxyacetylene torch and a filler rod. This is the easiest way to see how the physical
process of welding occurs. It’s always important when you’re welding
to wear the right safety equipment. Before I start the torch, I’m going to put
my goggles down. To start the torch, I add a little bit of
acetylene. I increase the size of the acetylene flame
until it’s burning nice and clear and hot. I add oxygen slowly until I get a nice sharp,
defined cone of flame. The hottest part of the flame is at the tip
of the blue, the very tip of the bright blue zinc. As you can see, as we start to heat the steel,
it goes from a red to orange and starts to get shiny. And we can start to add our filler material. And you can actually see that molten pool
of metal forming as we move along with the filler rod completing the operation. Now that the oxygen-acetylene welding process
is complete, we can examine the results. We had two separate pieces of material. We had a common molten pool of metal, into
which we added our filler rod. And now we have a complete, single, homogenous
piece of material. Two pieces of steel joined into one.

16 thoughts on “What Is Welding? | Welding

  1. You say soldering uses a third metal to stick them together and then you say we use the filler rod to fill up the gap. You sir are a joke.

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