TPi September 2019

Products & developments

Ultra-fine plasma welding from 0.1mm EWM AG offers its Microplasma plasma welding machine for delicate welding when working with materials as thin as 0.1mm. The high-tech device for professional users features the latest in digital control technology, cutting-edge inverter technology and compact plasma torches designed for welding work in fine detail. Areas of application include medical and dental technology, aviation, pneumatic components and welding of various metals to thermocouples.

EWM offers the Microplasma in three power variants. The current for the plasma arc is adjustable in fine 0.1 ampere steps from 0.3 to 20, 50 or 100 A, depending on the machine. Plasma technology offers the advantage over TIG welding that the pilot arc is adjustable, allowing 100 per cent ignition reliability, and the plasma arc is extremely constricted, allowing the user to precision-concentrate the water- cooled plasma torch on the desired point of the workpiece at a temperature of up to 22,000°C. Various plasma nozzle sizes make it possible to direct the heat input to an exactly defined area. The pilot arc is a special feature of plasma welding, as it ionises the part directed toward the workpiece, ensuring reliable ignition of the main arc. This is an advantage particularly in partially mechanised and automated production, in which reproducible results are required. The pilot arc current can be adjusted at four operating points during the welding process (before, during and

Image source: EWM

The new Microplasma for delicate plasma welding of workpieces with material thickness down to 0.1mm

adjusted in line with the welding current level. The gas-metering unit is another standard feature that makes working easier on a practical level. A control knob enables fine and highly precise regulation of the gas quantity, reducing gas consumption while enhancing weld quality and efficiency. EWM’s manual and automated welding torches are designed to enable precision work, ensuring optimal heat dissipation and featuring a sophisticated cooling functionality that increases the service life of consumables. This allows exact tack welding and welding of films, drive components, membranes, sieves and filters made of low- and high-alloy steel, for example, as well as bi-metal electrical and thermocouples. The new Microplasma uses EWM’s modular design: the compact power source is connectable to the cooling unit without the need for tools. A high-performance cooling aggregate is optionally available for mechanised continuous-use situations.

after welding, and during pauses in welding). The current for the pilot arc is adjustable in a range of 2 to 15 A. For operation of the machine, EWM has integrated the latest digital control unit, Comfort 2.0, with a visual display of the plasma welding sequence parameters that allows as many as 100 jobs to be set. All standard parameters are pre- configured, for plasma, TIG and pulse welding. Automated pulse functionality keeps the pulse frequency automatically

EWM AG – Germany info@ewm-group.com www.ewm-group.com

The plasma welding torches are compact and handy for both manual and automated welding

Image source: EWM

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TUBE PRODUCTS INTERNATIONAL September 2019

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