TIG Welding

Document Sample
TIG Welding Powered By Docstoc
					MIG Welding
 By: Jared McCombs
         and
     Vinnie DiBlasi
                                Overview
MIG= Metal Inert Gas Welding

An arc is struck between an electrode and
the sheet metal to be welded. The
electrode used in the machine shop is
Copper wire and is in the form of
continuous filler metal. The weld is
shielded by an inert gas, CO , to prevent
                            2

oxidation.

Uses
• Carbon steels, low alloy steels, stainless steels,
   most aluminum alloys, and zinc based copper
   alloys can be welded with the MIG Welder.
• Can weld very thin sections and metals that can
   not be easily welded with other types of welding.
            Welding Area
           WELDING AREA
 Helmets


                                       Electrical
                                       Outlet


                         Ventilation




Gloves
             Table for
                 Safety Concerns
• Always wear non-flammable, non-synthetic
  clothing when welding. (i.e. cotton).
• Ensure area is properly ventilated.
• Always wear welding gloves, a welding helmet,
  and a shop coat.
• Ensure the piece you are welding is safe to weld
  (i.e. a container containing flammable liquid).
• Caution: Some materials (i.e. galvanized
  materials) can become toxic when welded, so try
  to scratch off the toxic material and ventilate the
  area as much as possible.
• Caution: Welding produces high temperatures
  even after welding is completed.
             Setting up the Machine
•   Choose the correct wire gage based
    on the type of material and thickness
    of weld. You can determine the proper
    wire gage by calling companies              Aluminum
    (i.e. Oxarc) or looking up information in
    tables. Keep in mind, tables change
    often due to new material discoveries.
•   Set the wire speed and thickness dials
    to appropriate settings. (Lift up the
    hood to find the wire speed and
    thickness settings in a table.)
•   Turn on the MIG welder.
•   Open valve on CO2 tank to form an
    inert gas shield.
•   Ground the welder to the table using
    the clamp.
•   Turn the ventilation fan on using the
    switch on the wall.
          Setting Up Demonstration
Scene 1
Description:
Person enters welding area, and demonstrates the following process:


1. Turn on ventilation fan
2.Set the wire speed and thickness dials to appropriate settings. (Lift up the hood to find the wire speed and thickness
settings in a table.)
3.Turn on the MIG welder.
4.Open valve on CO2 tank to form an inert gas shield.
5.Ground the welder to the table using the clamp.




Script:


The following is the correct procedure for setting up the mig welder. First, make sure the ventilation is turned on at all
times while using the mig welder. Next, set the wire speed and thickness dials to appropriate settings. You can find
approximate settings on the inside cover of the welder. Turn on the mig welder. Open the valve on the CO2 tank.
Ground the welder to the table or the part. (make sure to say the script simultaneous with actions)
           Getting Started

• Prep surface to ensure a clean strong
  weld.
• Put on all safety gear.
• If the wire is protruding 1 cm past the
  nozzle, break it off on the table. Do not
  leave it stuck to the table.
• Ensure others around you know you are
  welding by saying, “COVER!”
          Welding Technique
• Hold the tip of the electrode against the piece
  being welded and pull the trigger until an arc is
  created between the electrode and the work
  piece.
• When MIG welding, push the electrode along the
  surface while slowly rotating wrist from side to
  side.
• It is important to be comfortable and have a
  steady hand while welding. You can use both
  hands to keep the torch steady.
Welding Demonstration
Scene 2

Description:


The purpose of this slide will be to demo the the proper and improper techniques of mig
welding. First have welder do a proper smooth and steady weld. Next demo a weld which the
welding speed is to slow and the weld burns through. Next demo a weld which is to fast and
does not penetrate through the material. Last, re-demo the correct techniques.


Script: We will now look at proper and improper techniques of mig welding. As you can see
the welder uses a steady smooth motion, moving the torch along the surface of the part. You
can see the bead has consistent properties along its axis. You can hear the welder is making
a sound like frying bacon.


In this demo you will see the welder using a motion that is too slow. The weld is burning
through and leaving holes in your part. The welder should increase speed.
In this demo you will see the welder using a motion that is too fast. You can see that the bead
is thin, and has inconsistent properties along its axis. The welder should decrease speed.
(show a good weld again) Remember that as you weld, take a deep breath, relax, count to
10, and use a steady motion.
                   Clean Up
• Turn off the power to the welder.
• Close the valve on the CO Tank.
                             2


• Wrap the ground cable around the welder.
• Wrap the torch around the welder.
• Unplug the welder from the socket and wrap the
  cord around the welder.
• Turn off the ventilation fan with the switch on the
  wall.
• Put away the helmet, gloves, and shop coat.

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:107
posted:6/22/2012
language:simple
pages:10