Difference between MIG and MAG welding

Welding Mig / Mag is a method of welding metal arcs in a protective gas environment,  also known as welding wires, CO2 welding. The international name is Gas Metal ARC Welding (GMAW).

Differentiate MIG welding and MAG welding

MIG (Metal inert gas): Inert gas used in welding alloy steel and ferrous metals.

MAG (Metal active gas): gas activated when welding ordinary steel, low alloy steel.

Inert gas: Mainly Argon or Hélium (blended gas).

Activation: Often (CO2), or Argon with oxygen (O2), sometimes Hydrogen (H2).

MIG-MAG welding uses an arc formed between the molten electrode wire and is automatically supplied to the welding element. This arc will be protected by inert gas or reducing gas. The fire of the arc is maintained by adjusting the electric welding machine specification of the arc. The arc length and welding current strength are maintained automatically while the welding speed and electrode angle are maintained by the welders.

Advantages of MIG-MAG welding methods

– High productivity

– Low cost – Low welding power, less thermal deformation.

– Sold to most metals.

– Easy automation.

– Long welds can be made without interruption.

– Require low welding skills.

Metal shifting during MIG-MAG welding

Short Circuit Arc Transfer (Short Arc)

Average intensity: 50 to 150 A.

Detailed thickness: 0.5 to 2 mm.

In this type of shifting, welding energy has the lowest value, due to its low welding currents and arc voltage. The shift occurs because of the continuous short-circuit between the electrode and the puddle. The volt-amps nature of the welding power play an important role in this type of shifting. Because of the low welding power, shallow depth of field needs special attention when welding thick parts. This short-circuiting feature makes it easy to reverse-weld, especially for thin metal applications.

In short, short shifts are suitable for the following applications:

– Apply when soldering.

– Apply when welding on thin sheet.

Be sure to:

– The contact tube tip is protruding from the spray nozzle from 5 to 10 mm when welded.

Electrodes (ESO) 5 mm.

– Angle of the torch from 65 ° to 70 °.

Globular Transfer

Average welding currents: 150 to 300 A.

Detail thickness: 2 to 6 mm.

In this type of translation, the metal shifts from electrodes to welding puddles in the form of irregularly shaped spherical droplets and random orientation, resulting in a significant increase in splash volume. When welding with CO2, it is possible to reduce the splash by adjusting the welding parameters so that the welded wire dips into the flowing hole and the burnt arc in the hole in the lung. CO2 arcs are often unstable and when soldered they sound like broken branches. The characteristic of this arc is the bumpy welding line compared to other shifts. Because the arc is immersed in a puddle, the weld depth is very deep, effectively cleaning the weld edge.

Bridge translation is applied in the following cases:

– Used to seal the coating.

– Han thickness is large.

– Han in a flat posture.

Spray Arc Welding

Average welding current intensity> 300 A.

Detail thickness> 6 mm.

Occurs when the protective gas has more than 80% argon. In this type of shifting the metal droplets are equal in size or smaller than the wire diameter. The droplets of metal are oriented along the arc axis. The fire is smooth and stable, resulting in less splashing and more flat weld. Arc energy (Plasma) spread across the conical region to make the edge of the weld be clean, but it also causes defects due to lack of flow for the weld edge. The penetration depth of this type of shear is deeper than that of welding with the lower weld sponge but is higher than that of a higher weld sphere.

Applicable when coating or finishing

– welded on thick sheet.

– Use when solder flat.

In order to ensure the spray transfer needs:

– The contact tube should be in the nozzle.

ESO papillary fever is about 20 mm.

– Angle of trench 75 ° to 85 °.

Video describing the types of shifting in MIG welding:

Currently, there are 03 types of technology for TIG welding machines: Diote, Thyristor and Inverter. Depending on the requirements of use and level of investment, MIG diy (cheap – easy to fix) or MIG Thyistor welding machine or MIG inverter welding machine can be used.

(Source: sai welding machine )

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