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Cold Metal Skills - Wayne County Public Schools

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Cold Metal Skills
6831.24
Skills Needed for
Cold Metal Tasks
Identify Metal
• Identify metal so that its
characteristics will be
known before trying to do
other cold metal and
welding tasks
Cutting Cold Metal
• Done to make it the
correct size: length and
width
Thin Metal
• Cutting thin cold metal
is done by using
snipes, shears, or a cold
chisel
Thick Metal
• Cutting thick cold metal
is done with a hacksaw or
a metal cutting saw blade
in band saws, jigsaws, or
reciprocating saws
Drilling
• The method used to
make round holes in
cold metal using drills
and metal cutting bits
Bending Metal
• Bending cold metal not
more than 3/8” thick can
be done with a ball peen
hammer and machinists
vise
Bending Metal
• Metal thicker than 3/8”
should be heated
before bending
Shaping Cold Metal
• Shaping cold metal can be
done by cutting, filing,
grinding, or bending or
combining any of these
skills
Filing
• The main reason to file
metal is to smooth rough
places, but filing is also
used to sharpen some
tools
Grinding
• Grinding is the procedure
used to sharpen points or
edges of cutting tools
made of high carbon steel
Demonstrating Cold
Metal Skills
Ferrous
• Contain iron
Ferrous Metals
• Will rust and have to
be painted or oiled to
protect
Ferrous Metals
• Cast iron
• Wrought iron
• Steel
Non-ferrous
• Do not have iron
Nonferrous Metals
• Aluminum
• Copper
• Magnesium
Identify Metal
• Identify metal so that its
characteristics will be
known before trying to do
other cold metal and
welding tasks
Metal Identification
• Identified by color,
weight, texture, use,
shape, forge or cast
marks, and spark test
Spark Test
• Color, shape, quantity,
length, and position of
sparks are used to
identify metals
Cast Iron
• Has red lines in the
sparks
High Carbon Steel
• Has yellow lines with
several star bursts
Wrought Iron
• Has long straw-colored
lines without burst
Galvanized Steel
• Should be identified
because it gives off
poisonous gas when
heated for cutting or
welding
Snips or Shears
• Will not cut metal that
is too thick
Thick Metal
• Should be cut with a
metal cutting saw such as
hacksaw, band saw, or
abrasive cut-off saw
(chop saw)
Drilling Metal
• Done by securing
metal in a machinist’s
vise
Drilling Metal
• Using a center punch and
ball peen hammer to dent
the metal to prevent the
drill bit from wandering
from the desired location
Drilling Metal
• Using a drill and bit to
drill the hole
Machinist’s vise
• Should be used to
secure cold metal for
cutting, drilling, filling,
or bending
Round File
• The inside of a drilled
hole should be
smoothed with a round
file
Flat File
• Can be used to smooth
the cut edges of cold
metal
Grinder
• Used to shape and
sharpen the hollowground cutting edge of
tools such as wood chisels
Alloy
• A mixture of two or
more metals
Steel
• Is an alloy of iron and
carbon
Mild Steel
• Known as the
workhorse of steels
Mild Steel
• Used to make
expanded metal
Stainless Steel
• Will not rust
Cold Metal Skills
6831.24
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