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Gas Metal Arc Welding

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Gas Metal Arc Welding GMAW Modes of Metal Transfer GMAW Filler Metal Designations ER - 70S - 6 Shielding Gas Shielding gas can affect Weld bead shape Arc heat ... – PowerPoint PPT presentation

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Title: Gas Metal Arc Welding


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(No Transcript)
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Gas Metal Arc Welding
Gas Metal Arc Welding
3
GMAW Modes of Metal Transfer
Gas Metal Arc Welding
Globular
Spray
Pulsed Spray
Short Circuiting
4
GMAW Filler Metal Designations
  • ER - 70S - 6

Composition 6 high silicon
Electrode
Solid Electrode
Rod (can be used with GMAW)
Minimum ultimate tensile strength of the weld
metal
5
AWS Specifications for GMAW Wire
AWS A5.18 - Carbon Steel Electrodes AWS A5.28 -
Low Alloy Steel Electrodes
6
Shielding Gas
Gas Metal Arc Welding
  • Shielding gas can affect
  • Weld bead shape
  • Arc heat, stability, and starting
  • Surface tension
  • Drop size
  • Puddle flow
  • Spatter

Ar
He
CO2
Ar-He
7
GMAW Advantages
Gas Metal Arc Welding
  • Deposition rates higher than SMAW
  • Productivity higher than SMAW with no slag
    removal and continuous welding
  • Easily automated

8
Quality
Gas Metal Arc Welding
  • Spatter
  • Droplets of electrode material that land outside
    the weld fusion area and may or may not fuse to
    the base material
  • Porosity
  • Small volumes of entrapped gas in solidifying
    weld metal

9
Limitations
Gas Metal Arc Welding
  • Equipment is more expensive and complex than SMAW
  • Process variants/metal transfer mechanisms make
    the process more complex and the process window
    more difficult to control
  • Restricted access
  • GMAW gun is larger than SMAW holder
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