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
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, CO2, to prevent
Table for Ground clamp
(i.e. Oxarc) or looking up information in tables. Keep in mind, tables change often due to new material discoveries.
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.
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)
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.