welding: intro to the gmaw machine gas metal arc welding (“mig”) copyright © texas education...

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Welding:Intro to the GMAW Machine

Gas Metal Arc Welding (“MIG”)

MIG Illustration

Page 3: Welding: Intro to the GMAW Machine Gas Metal Arc Welding (“MIG”) Copyright © Texas Education Agency, 2012. All rights reserved

MIG Chart

Page 4: Welding: Intro to the GMAW Machine Gas Metal Arc Welding (“MIG”) Copyright © Texas Education Agency, 2012. All rights reserved

MIG Machine

Page 5: Welding: Intro to the GMAW Machine Gas Metal Arc Welding (“MIG”) Copyright © Texas Education Agency, 2012. All rights reserved

MIG Gun

Page 6: Welding: Intro to the GMAW Machine Gas Metal Arc Welding (“MIG”) Copyright © Texas Education Agency, 2012. All rights reserved

MIG Wire Feeder

Page 7: Welding: Intro to the GMAW Machine Gas Metal Arc Welding (“MIG”) Copyright © Texas Education Agency, 2012. All rights reserved

Wire feeder

Page 8: Welding: Intro to the GMAW Machine Gas Metal Arc Welding (“MIG”) Copyright © Texas Education Agency, 2012. All rights reserved

MIG Advantages

• High quality welds can be produced much faster

• Since a flux is not used, there is no chance for the entrapment of slag in the weld metal resulting in high quality welds

Page 9: Welding: Intro to the GMAW Machine Gas Metal Arc Welding (“MIG”) Copyright © Texas Education Agency, 2012. All rights reserved

MIG Advantages

• The gas shield protects the arc so that there is very little loss of alloying elements. Only minor weld spatter is produced.

• Very versatile and can be used with a variety of metals and alloys

• Can be operated several ways, including semi and fully automatic

Page 10: Welding: Intro to the GMAW Machine Gas Metal Arc Welding (“MIG”) Copyright © Texas Education Agency, 2012. All rights reserved

MIG Disadvantages• Generally not used in overhead welding

position because of the high heat input and the fluidity of the weld puddle

• Complex equipment

• Wire can “squirrel’s nest”

Process: MIG (GMAW) Flux cored (FCAW) Arc Welding Power

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