SHOW PREVIEW: PHOTONICS WEST LASER WELDING OF I
n the last 50 years, laser material processing has successfully been established, especially in the area of thin materials. With the availability of more powerful laser sources it
is now possible to process larger dimensions. Combining a laser with one or two gas metal arc (GMA) sub-processes to create a hybrid welding system means brilliant laser radiation can be used for conventional welding practices including where the joining gap is relatively wide. A hybrid welding process, developed at Laser
Zentrum Hannover (LZH), which uses a 16kW disk laser, can join up to 23mm of steel grade X70 for pipeline applications in flat position within a single process step. Tis is over the entire thickness at a speed of about 1.5m/min. LZH has also developed a laser-MIG welding
process for the aluminium alloy EN AW6082T6. Tick pieces of aluminium and aluminium alloys are used in large-scale construction, such as in shipbuilding, manufacturing of rail vehicles and heavy-duty trucks, and making compressed gas tanks and containers. Te laser-MIG welding system uses a 16kW laser and two metal inert gas (MIG) welding torches in one set-up for one-side welding of heavy plates. Te system can join sheets 12mm thick at a welding speed of 6m/ min. Furthermore, the welding process can bridge gaps up to 0.4mm and vertical edge offsets up to 2.0mm. Te welding system developed at LZH
produces seams at quality level B, the highest quality level, of ISO 139192:2001 and of ISO/ FDIS 12932:2012. Te welded seams have a
www.lasersystemseurope.com | @lasersystemsmag Test set-up of the laser-GMA hybrid welding process
maximum pore height of only 0.3 per cent, a shrinkage groove of 0.34mm and root concavity of 0.46mm, all of which is within the limits to achieve quality level B. For applications like shipbuilding, high-
strength fine-grain (S690QL) structural steel is used, which can be 15mm thick. Te S690QL grade of steel is characterised by a high carbon equivalent of 0.48 per cent, so that it is necessary to preheat the workpiece before processing. A perpendicular inductor is used to preheat the part, because of the advantages regarding efficiency and direct heating. Te GMA-laser hybrid welding process,
XXL STRUCTURES
Joining very large structures is now possible using hybrid laser-arc welding approaches. In their keynote presentation to be delivered at Photonics West, a team from Laser Zentrum Hannover detail the systems developed at the German research institute for welding extra-large structures
Paper by Stefan Kaierle, André Springer, Oliver Seffer, Rabi Lahdo, Alexander Barroi and Jörg Hermsdorf LASE conference keynotes
Further keynote and invited presentations within the ‘high-power laser materials processing: lasers, beam delivery, diagnostics, and applications III’ conference
SESSION 2: Laser surface treatment l Tuesday 4 February 2014, 10:40am-12:10pm
Trends and basic investigations in high power laser materials processing (keynote presentation),
By Marco Holzer, Patrick Haug, Volker Rominger and Thomas Harrer at Trumpf Laser- und Systemtechnik (Germany), and David Havrilla at Trumpf (United States)
SESSION 5: Special laser processes l Wednesday 5 February 2014, 2:00pm-3:30pm
Lasers for welding and their potential in production at GE (keynote presentation), By Marshall Jones, GE Global Research (United States)
SESSION 9: Laser additive manufacturing of metal structures
l Thursday 6 February 2014, 1:30pm-3:20pm
High performance laser additive manufacturing of metal components (invited paper),
By Weidong Huang, Xin Lin, Northwestern Polytechnical University (China)
ISSUE 21 • WINTER 2013 LASER SYSTEMS EUROPE
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