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MIG-MAG Welding

Shielded arc welding

The Metal Inert Gas (MIG) or Metal Active Gas (MAG) welding is a semi-automated process, widely used in many sectors of industry, such as shipbuilding, railroad construction and the production of heavy plants and machinery.

SAF-FRO can provide a wide range of MIG-MAG welding inverter and step controlled power sources (DIGIWAVE, DIGISTEEL, DIGISTEP…). Our offer of non alloyed (FILCORD...) or high alloyed steel solid wires (FILINOX 316L), as our wide range of non-alloyed steel flux cored wires (STEELCORD 14HD, SAFDUAL 100...) will surely answer your most demanding applications.

Principle of the process

The process melts and fuses metals using the intense heat generated by an electric arc between the metals to be joined and a filler wire (solid or flux cored). The wire is progressively melted at the same speed at which it is being fed by the wire feeder and forms part of the weld pool.
Both the arc and the weld pool are protected against atmospheric contamination by a shield of inert (non-reactive) gas.

The metal transfer

Schéma MIg-MAG 2 SAF-FRO

Transfer modes

Schéma MIg-MAG 3 SAF-FRO

PCM - The new arc transfer mode

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Scheme of a manual installation for MIG-MAG welding

Schéma d'une installation manuelle de soudage MIG-MAG SAF-FRO

To know more about MIG-MAG welding

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More about Arc transfer modes

6 different Arc transfer modes to discover

Short-Arc transfer
The Short Arc has a low spatter rate with good wetting and is suited to welding thin steel plate, working in position and penetration passes This mode is characterised by alternating short circuits and light arc.

Speed Short-Arc™ transfer
This Arc transfer mode allows a high travel speed due to a rigid arc and a cold regime. It is very effective for welding thin steel plates, working in position and in closed angle and filling bevels. The SSA™ is used for short circuit welding though the normal globular regime travel speed domain.

  • Advantages:

    • Increase in travel speed
    • Reduced distortion (thin steel sheets)
    • Suited to welding in position
    • Tolerance and usability

Globular transfer
Metal is transferred in the arc as large drops with hardly mastered trajectories. It's a transfer mode giving low quality results.

Spray-Arc transfer
Metal is transferred in the arc as small droplets. The mode is very regular but requires high welding parameters and therefore is usable only for thickness above 5 mm.

Pulsed transfer
This pulsed current called “standard”, is a very efficient arc regime; it enables welding of fine sheet metal from 1 mm thickness.It is used on all metals (steel, stainless steel, aluminium) with solid wires as with certain flux-cored wires. Almost total elimination of spatter, and thus of finishing.

  • Advantages:

   • Excellent weld bead appearance
   • Reduction of fume emissions
   • All positional

Spray Modal™ tranfer
This process, especially for light alloys, greatly reduces micro porosity and increases penetration. It can be used in all positions and is particularly effective on aluminium sheets greater than 3 mm. Spray-MODAL™ uses a low-frequency modulated current which has the effect of removing most hydrogen bubbles from the weld pool before solidification.

  • Advantages:

   • Reduces porosity
   • Increases penetration
   • All-position welding
   • Higher travel speed