TASK: Complete the MIG welding test
MIG (Metal Inert Gas) welding is a process in which an electric arc forms between a consumable wire electrode and the workpiece. This creates heat to both the metals, causing them to melt, and join. A shielding gas (usually argon and oxygen) feeds through the hand piece , which shields the process from contaminants in the air.
MIG (Metal Inert Gas) welding is a process in which an electric arc forms between a consumable wire electrode and the workpiece. This creates heat to both the metals, causing them to melt, and join. A shielding gas (usually argon and oxygen) feeds through the hand piece , which shields the process from contaminants in the air.
This image illustrates the parts within the nozzle of a MIG hand piece. Voltage and wire speed can both be adjusted at the welding unit. When the trigger on the hand piece is squeezed the electrode wire is fed through the lead until it creates an arc between it and the workpiece. The gas shield (regulated at the top of the gas bottle) also feeds through the nozzle when the trigger is pressed.
A groove weld is a process of removing original metal from the weld joint. This is done to allow for full penetrating welds. Welds that have completely Penetrated the metal are often stronger than the metal itself.
When laying down a bead of weld, there are many ways of how to handle the hand piece. Each style can determine the quality of the weld. the most common styles are circular, zig-zag and figure 8.
Videos
The following videos provide relevant information for you to complete the Can Crusher. 'MIG Welding basics for Farm and Automotive Repairs' is an excellent video, pay attention to the PPE and safe working practices being used. 'MIG Welding Tips' is a long video and may be watched at home or once there is no other work to be completed. The information in this video is further advanced and will be very useful if you pursue a career in metal fabricating or wish to study Industrial Technology through your HSC. |
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