welding brazing pipe tube
Post on 06-Apr-2018
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from wikipedia :
Brazing is a metal-joining process whereby a filler metal is heated above and
distributed between two or more close-fitting parts by capillary action. The filler
metal is brought slightly above its melting (liquidus) temperature while protected by
a suitable atmosphere, usually a flux. It then flows over the base metal (known as
wetting) and is then cooled to join the workpieces together.[1] It is similar to
soldering, except the temperatures used to melt the filler metal are above 450 C
(842 F).
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Welding is a fabrication or sculptural process that joins materials, usually metals or
thermoplastics, by causing coalescence. This is often done by melting theworkpieces and adding a filler material to form a pool of molten material (the weld
pool) that cools to become a strong joint, with pressure sometimes used in
conjunction with heat, or by itself, to produce the weld.
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This is in contrast with soldering and brazing, which involve melting a lower-
melting-point material between the workpieces to form a bond between them,
without melting the workpieces.
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in brief
WELDING you melt the workpieces as well as the filler material causing
coalescence (coalescence - the union of diverse things into one body or form) so
the seperate pieces become one piece
BRAZING you join the work without melting the workpieces but using a melted filler
to join them
here the pieces to be joined are still seperate but the gap between them is filled
with the solidified weld pool
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re: pipe and tube (also from wikipedia)
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A pipe is a tubular section or hollow cylinder, usually but not necessarily of circular
cross-section, used mainly to convey substances which can flow liquids and
gases (fluids), slurries, powders, masses of small solids. It can also be used for
structural applications; hollow pipe is far stiffer per unit weight than solid members.
In common usage the words pipe and tube are usually interchangeable |
v
but in industry and engineering, the terms are uniquely defined. Depending on the
applicable standard to which it is manufactured, pipe is generally specified by a
nominal diameter with a constant outside diameter (OD) and a schedule that
defines the thickness.
Tube is most often specified by the OD and wall thickness, but may be specified by
any two of OD, inside diameter (ID), and wall thickness.
Pipe is generally manufactured to one of several international and national
industrial standards.[1]
While similar standards exist for specific industry application tubing, tube is often
made to custom sizes and a broader range of diameters and tolerances. Many
industrial and government standards exist for the production of pipe and tubing.
The term "tube" is also commonly applied to non-cylindrical sections, i.e., square or
rectangular tubing. In general, "pipe" is the more common term in most of the
world, whereas "tube" is more widely used in the United States.
Both "pipe" and "tube" imply a level of rigidity and permanence, whereas a hose (or
hosepipe) is usually portable and flexible. Pipe assemblies are almost always
constructed with the use of fittings such as elbows, tees, and so on, while tube may
be formed or bent into custom configurations. For materials that are inflexible,
cannot be formed or where construction is governed by codes or standards, tube
assemblies are also constructed with the use of tube fittings.
soooo... PIPE is cylindrical but not always round in cross section ,
usually categorized by the outside diameter and a schedule that defines the
thickness(whatever that means)and
is made to recognized standards as a rule.
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pipes are almost always constructed using fittings to go round corners etc
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TUBE can be cylindrical but can also be a non cylindrical section(i.e. square or
rectangular cross section)
is usually categorised by any two of the following
outside diameter......inside diameter.....wall thickness
is often made to customized sizes and covers a broader range of applications and
tolerances than a pipe.
Tubes can be formed and bent into shape for specific applications or where this is
not possible because of the nature of the materials used, or to comply with
government or industry standards, tube fittings can be used.
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the difference between welding and brazing
in welding the two pieces melt themselves together using a weld pool of a different
material which makes a mixture of all three things so they actually combine to join
them together
Brazing the two pieces are joined by a melt of another metal but they do not melt
and mix together so it is actually still 3 separate components more like gluing them
together with molten metal
the difference between pipes and tubes
pipes are always cylindrical ie rounded but not always circular in cross section
tubes are not always cylindrical
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pipes are limited in the range of sizes and tolerances,pipes are generally only
available in certain recognized sizes
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tubes are more versatile and available in custom sizes for specific uses
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pipes are almost always joined using additional pieces to change direction
tubes are often bent to go round corners etc
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it is harder to explain the difference between tube and pipe
as the difference is less clear
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