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Gas-shielded metal-arc welding with highly dynamic inverter power sources

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Plauen Stahl Technologie GmbH, Plauen, Germany. Every year, around 20 000 t of structural steelwork leave the production facilities – for these steelwork structures, safety and quality are the top priorities

Some 30 years of experience in structural steelwork engineering – a specialist area for Plauen Stahl Technologie is the production of supporting steelwork for boilers, air pre-heaters and hoppers for coal-fired power plants

Fabrication of a lock gate for the Danube/Eisernes Tor

The 14 highly dynamic inverter power sources, type Phoenix 521 puls forceArc®, from the German market leader EWM HIGHTEC WELDING, Mündersbach, are ideal for the forceArc® joining process that is becoming ever more prevalent in the structural steelwork industry

Plauen Stahl now also joins 800 mm long seams with forceArc® – with plates as thick as 80 mm

The perfect weld seam! The powerful forceArc® is extremely easy to control. It also ensures excellent fusion penetration in the weld flank. Nobody was as yet been able to spot a single fusion error between the welding layers

If pores occur at all, they are generally to be found on the fringe areas of the parent metal. The parent metal with its non-metallic impurities, rather than the welding process, is largely responsible for this. It can only be prevented by better quality rolled metal plates with fewer impurities

The inspection inside the welded structure reveals fillet welds that correspond to evaluation group B in accordance with ISO 5817, with a defined hollow fillet and corresponding overlap – and at 3 mm, the a-measurement also complies with the value required by the standard. It is therefore now possible to weld certain seams from one side only. The backing run is created “automatically”

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