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Fronius, a specialist in welding technology, has introduced CMT Twin, a tandem welding process that allows users to exploit two cold-metal-transfer (CMT) processes or combine a CMT process with a GMA pulsed-arc welding process in a single system. CMT Twin is suitable for use in the automotive and supplier industries, in shipbuilding and mechanical engineering and in the power generation field.

CMT Twin comes with two digital power sources that work completely separately from one another, allowing the weld processes to be individually adjusted to the differing requirements of each application and allowing the selection of any wire feeder (within given physical limitations). This makes it possible to set widely diverging wire-feed speeds, as well as allowing flexibility in terms of which weld processes are used. Users can now control the thermal input and deposition rate very precisely, allowing them to achieve the optimum welding speed and seam quality with virtually any welding position and combination of materials.

CMT Twin is a suitable complement to the existing Time Twin high-performance twin-wire weld process. Time Twin uses two arcs (one leading and the other trailing, which may be pulsed if necessary), synchronised in 180° phase opposition. This means that there is relatively limited scope for diverging the wire-feed speeds.

Consequently, Time Twin is a good choice when the priority is to raise the welding speeds and/or deposition rate. However, on welds requiring a large seam cross section, there is a risk that excessive heat input may cause problems — as on fillet welds, where the seam will ‘sag’ if the weld pool becomes too liquid. These cases call for a process in which the thermal input is lower and can be precisely adjusted.

CMT Twin combines the advantages of Time Twin and CMT in one system and is particularly well suited to welding light-gauge sheets at high speed and for positional welding with high deposition rates yet without exceeding the optimum thermal input.

Key benefits of CMT Twin

  • Use of the CMT process — in which the electrode is moved back and forward in a controlled manner during welding so as to manually assist droplet detachment — means it inputs considerably less heat than a conventional dip-transfer arc.
  • Hardly any spattering occurs and the process is even more stable since the arc length is unaffected by the surface of the workpiece or the welding speed.
  • Iit is possible to achieve high welding speeds; in the case of a fillet weld welded at the lap joint of two 2mm steel sheets, these can be as fast as 4m/min.
  • To ensure a perfect weld right from the very beginning, in CMT Twin the ‘trail’ electrode does not start work until the ‘lead’ electrode process has stabilised and the power source for the ‘trail’ electrode has received a start-up signal.
  • Because the processes being used by the two electrodes do not need to be harmonised with one another by the user, CMT Twin is extremely easy to handle.
  • Other advantages include high process reliability, excellent seam quality, good gap-bridging ability and high speed, as well as the fact that only minimal post-weld machining is needed.

Fronius UK

Fronius UK, a subsidiary of Fronius International, provides the UK welding market with solutions for MIG/MAG, TIG, electrode, laser, plasma and resistance spot welding and automation. Its new state-of-the-art facility in Milton Keynes extends over 3,800m2 and houses the Tech Support team, the Repair Center, a warehouse and a training area and epitomises the importance of being able to deliver a first-class service to customers.

Fronius UK, a subsidiary of Fronius International, provides the UK welding market with solutions for MIG/MAG, TIG, electrode, laser, plasma and resistance spot welding and automation. Its new state-of-the-art facility in Milton Keynes extends over 3,800m2 and houses the Tech Support team, the Repair Center, a warehouse and a training area and epitomises the importance of being able to deliver a first-class service to customers.

Sales and service teams, both at head office and regionally, ensure that customers are supported as quickly as possible on their own premises. In addition, customers benefit from services such as calibration, a warranty extension and a maintenance contract.

For decades, Fronius has made significant contributions to advances in welding technology. The company is still in family ownership and its welding technology division is now one of the world’s technology leaders in the arc welding market segment. It is also the market leader in Europe.

Welding Technology is one of three Fronius divisions. Since the 1940s, Fronius has been creating technologies and solutions for monitoring and controlling energy in battery-charging systems, and since 1992 the same in solar electronics. The mains-connected inverter, the unique Fronius Service Partner programme and products for monitoring photovoltaic systems make Fronius one of the leading suppliers in the field of solar electronics.

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