What is COOGAR™ SG?

Coogar SG is the perfect multi-application active gas mixture for the MAG welding of plain carbon and alloy steels.

Why choose Coogar SG?

• Coogar SG can be used when:
  • short circuiting (dip) transfer MAG welding
  • spray transfer MAG welding
  • synergic pulsed MAG welding
  • MAG welding with flux cored wires
• It is suitable for all thicknesses.
• It has all-positional capability.

The benefits of Coogar SG

Coogar SG offers the following benefits over CO2:

• Increased welding speed.
• Improved bead profiles, resulting in less wire being used.
• Reduced spatter levels.
• Less particulate fume is produced.
• Enhanced fusion profiles.
• Higher strength welds are obtained, due to lower element loss.

The technology of MIG/MAG welding with Coogar SG

	The effect of shielding gas composition on weld profile/bead shape.

The metal transfer characteristics achieved with Coogar SG are excellent across the range of welding currents and wire diameters. This ensures sound, high quality welds, from dip transfer on thin sheet to spray transfer on thick section material.

When CO2 is used as the shielding gas the violent arc action it produces results in a good deal of spatter and an untidy bead. Very accurate control of welding conditions is necessary to produce a satisfactory result. In contrast, Coogar SG produces a stable arc resulting in little or no spatter and an excellent bead appearance. Furthermore, Coogar SG is welder friendly as excellent results can be achieved even when the welding conditions are not optimised, and particulate fume levels are reduced when compared with CO2.

The relatively high percentage of argon in Coogar SG permits easy arc starting because of the low ionisation potential of the gas. The relatively high density of argon also promotes effective shielding at moderate gas flows. Unlike CO2 Coogar SG gives an axial spray type of metal transfer which produces lower spatter levels.

The controlled additions of CO2 and O2 to Coogar SG are used to optimise the characteristics of the shielding medium.

CO2 dissociates partly in the arc producing additional heat, allowing better penetration than could be obtained with pure argon. The small percentage of O2 in Coogar SG provides a more stable arc and increases the wettability of the weld pool. These advantages result in better metal transfer, increased penetration and optimum bead profiles.

Analysis

Coogar SG: 83% Ar, 15% CO2, 2% O2 (EN439 : M24).

Parameter guide for Coogar SG
Dip transfer
material thickness (mm)	flow rate (1/min)	wire dia. (mm)	amps	volts
3.2 6 9 12	9-12 9-12 12-14 14-17	1.0 1.0 1.2 1.2	120-150 130-160 150-180 160-200	18-22 19-23 20-23 21-24
Spray transfer
material thickness (mm)	flow rate (1/min)	wire dia. (mm)	amps	volts
9 12	14-17 17-19	1.2 1.6	240-260 250-280	25-28 26-30
This parameter table is to be used as a guide, parameters will depend upon joint type, wire diameter etc.

What is COOGAR SG? is available in the Portable Document Format (.pdf). To view a .pdf file, you will need a free copy of the Acrobat Reader.

What is COOGAR SG?

Get the Acrobat Reader