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Introduction to practical application of wire feed welding.

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Presentation on theme: "Introduction to practical application of wire feed welding."— Presentation transcript:

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2 Introduction to practical application of wire feed welding

3 MIG – Metal Inert Gas Welding  May be called GMAW (Gas Metal Arc Welding)  Avoid cutting in drafty or windy conditions  Molten pool is shielded by the inert gas envelope  Joints are stronger, more ductile, and more corrosion resistant  Flux center wire has slag; Solid wire has no slag, thus eliminating slag inclusion  Welded metal does not readily distort

4  Power Supply  Gas Supply  Wire feeder  Gun and Whip  Process

5 MIG Machine Operation  Wire is fed at a pre-set rate  Gas flows at about 35 cubic feet per hour and is directed around the welding wire for shielding

6 Advantages Disadvantages Welding can be done in all positions High rates of metal deposition Excellent filling ability for poor-fit joints High weld Quality No electrode stub loss Less distortion due to narrow, deep weld profile Easier process to learn and use  Welding power source expensive  Shielding gas expensive  Higher electrode wire cost  Most machines require three- phase input power  Not as versatile as SMAW for maintenance 4Welding cast iron 4Cutting 4Carbon arc torch applications

7  Stationary  Portable  Integrated  Nonintegrated  Advantages and Disadvantages  Adjustments

8  Containers  Regulators  Ball and Dial indicators  Gases Materials  Carbon dioxide Steel  Argon Stainless Steel  Helium Aluminum  Oxygen

9  Types  Integrated  Component  Advantages  Disadvantages  Parts 4Feed motor 4Drive Assembly 4Spool Assembly 4Wire speed control 4Computer controller

10  Gun Types 4Inline 4Handle  Gun Characteristics 4Wire Guide 4 Tips 4Shielding Gas Nozzle 4Insulator 4Internal Gun wire driver  Whip Characteristics 4Shielding Gas 4Sheath 4Liner 4Power feed

11  Wire Types 4Hard Wire (Solid) 4Dual Shield 4Flux Core  Polarity 4DCRP 4DCSP  Advantages  Disadvantages  Advantages  Disadvantages

12  http://MSN.yahoo.com/ Business_and_Economy/ Companies/Manufacturing/ Metal_Working/Welding/ Equipment  www.ewi.org  www.miller.com

13 TIG – Tungsten Inert Gas Welding

14 TIG  Welding process uses a non-consumable tungsten electrode to form an arc which is shielded by inert gas  Filler rod may or may not be used  AC or DC  Argon or Helium gas used  Torch needs current and inert gas to weld  Ceramic cone protects electrode  Air cooled or water cooled

15 Advantages of TIG  Clean welds – no flux  Weld strength is high  All position use  Visibility is high  Narrow beads – distortion is low  No Spatter  Weld all weldable metals  Best for Aluminum and Magnesium  Best for thinner metal

16 Disadvantages of TIG  Skill required – more complicated  High Frequency interference may occur (radios, TV’s, etc.)

17 Inert Gases for Shielding  Argon  Cheap – comes from air  Heavier than air – blankets weld well  Provides clean welding of Aluminum and Magnesium  Best with AC  Helium  Arc voltage is greater  Hotter arc  Deeper Penetration  Fast Speed  Less Distortion  May spatter more than Argon  Carbon Dioxide  Cooling effect  Low cost  Produces Spatter  Deep penetration  Not same inert characteristics as Argon and Helium


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