Transcript Welding - Clinton

Welding
Transportation
Mr. O’Rourke
What is Welding?
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A fabrication process that joins metal.
This is done by melting the work pieces
and adding a filler material to form a pool
of molten material that cools to become a
strong joint.
How Does it Work?
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Welding uses an energy source (gas
flame, electric arc, or laser) to heat and
melt metals together. This meting causes
impurities in the metal which are shielded
by various gases to provide a clean weld.
Types of Welding
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Gas Metal Arc Welding (metal inert gas or
MIG)-is a semi-automatic process that uses a
continuous wire feed as an electrode and an
inert or semi-inert gas mixture to protect the
weld from contamination.
MIG Welder Components
Power Switch
 Voltage Adjustment
 Wire Speed Adjustment
 Torch
 Ground
 Wire Spool
 Gas tank
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How Do We MIG Weld?
Clean weld surface
 Ground out work piece
 Set voltage and wire speed
 Squeeze trigger keeping torch tip 1/4-1/2”
from work piece
 Move torch tip in small circular, U shaped,
or zig-zag motion
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MIG Weld Problems
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Things to consider: Torch distance, travel
speed, voltage setting, wire speed setting,
torch motion
Safety
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Safety Glasses
Welding Mask
Gloves
Long sleeves, pants
No open toe shoes
Ventilation
Bright Light!!!- High Heat!!!
 Yell Cover Before Beginning Your Weld!
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Benefits of MIG Welding
Can be use on carbon steel, stainless
steel, aluminum, copper, nickel, bronze
and more
 All position capabilities
 Fairly easy to learn
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Disadvantages of MIG
Only for thin to medium thicknesses
 Less portable than other forms due need
for gas tank
 Sloppier than other forms
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Other Forms of Welding
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Gas tungsten arc welding
(tungsten Inert Gas, TIG)
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Shielded metal arc welding
(stick, arc)
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Oxygen-acetylene