We use cookies to personalize content, provide social media features and analyze traffic to our site. You give your consent to the use of cookies if you continue to use our websites. For more information, please read the page about our privacy policy.
Web Content Display

GMA Welding


MSG-welding is the most widely used welding process.  Depending on the base material being welded and the shielding gas used, the process is divided into:  

  • Metal-Active-Gas welding (MAG)
  • Metal-Inert-Gas welding (MIG)


In both cases the procedure is the same. An endless wire electrode is fed to the arc by a wire conveyor and melted under a shielding gas jacket.   The diagram illustrates the structure of an MSG welding process.

The shielding gases have different properties depending on their composition, and therefore different effects on the weld result. Their main task is to shield the liquid melt from the atmosphere. The atmosphere contains nitrogen, oxygen and moisture, which depending on the material being welded can have a negative effect on the weld or lead to a failed welding attempt.   

Shielding gases influence:

  • The nature of metal transfer
  • Melt flow properties
  • Ignition characteristics of the arc  
  • Arc stability
  • Heat transfer
  • Weld penetration profile
  • Chemical composition of the weld metal  
  • Spatter frequency and size  


Messer supplies shielding gases for MSG welding. Depending on application and material, gases with the brand names Ferroline, Inoxline or Aluline are used.


  • High process safety  
  • Very good joint strength
  • Cost efficient welding process
  • Suitable for all welding positions
  • Low to high rates of deposition possible