TIG Welding University of Idaho（钨极惰性气体保护电弧焊爱达荷州大学）.ppt

MIG WeldingBy: Jared McCombsand 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, CO2, to prevent 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 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 (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 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