Lincoln Electric High-Speed and High-Deposition Welding manual Tandem MIG, What Is It?

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W A V E F O R M C O N T R O L T E C H N O L O G Y T M

Tandem MIG

High-Speed and High-Deposition Welding

What Is It?

Tandem MIG is a dual wire GMAW process that is used in automated welding applications to improve welding productivity and part throughput. The process utilizes two welding power sources and two wire feeders acting in tandem to deliver two wire electrodes through a single welding torch. The dual wire welding torch, capable of often doubling the welding output of a single wire torch, is used in hard automation and robotic arc welding cells in the same manner as a single wire welding torch would be. The two welding arcs that are generated in the Tandem MIG process are electrically isolated from one another and are

Tandem MIG Configuration

APPLICATION

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controlled independently. The welding arcs work together, generally separated by less than 0.50 inches, in the same weld pool. The independent control of the two welding arcs is used to control the thermal and fluid dynamics of the weld pool to further enhance welding performance. The added deposit rate achieved by the dual wire delivery and the added weld pool control is used to overcome single wire limitations to produce high travel speeds and electrode melt-off rates (weld metal deposition). Special power source welding software is used to allow the two welding arcs to operate in unison.

Two Wire Feeders

Shielding Gas

Two

Power Sources

Two Separate Welding Arcs

One

Welding Torch

One Weld Pool

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Contents Tandem Migtm What Is It? Tandem MIGHow Does It Work? Flat and Horizontal Fillet Welds 3 mm 6 mm Using Tandem MIGFlat and Horizontal Lap Welds 1.5 mm 5 mm Joggle Joints 1.5 mm 4 mmU Groove Butt Welds Flat and Horizontal Fillet Welds 6 mm and LargerBevel and V Groove Joints Earth Moving Equipment Heavy Plate FabricationSolution Tandem MIG Better Weld Metal Follow CharacteristicsProblem Single Wire Gmaw Comparing High-Speed Tandem MIGHigher Deposition rates Comparing High-Deposition Tandem MIGTravel Speed Comparison Reduced Heat Input and Improved Bead Profiles Horizontal Fillet WeldDeposition Rate Comparison Torch Positioning Lead ArcTrail Arc Joint Selection Shielding GasWork Lead Connection Configuring Tandem MIG Configuring Tandem MIG Models AD1201 1 and AD1201Power Feed 10R Wire Feeder Lincoln Welding Systems Featuring Tandem MIGPower Wave 455M Power Wave 655RAccu-Trak SuperArc/SuperGlideAccu-Pak