| Dr Elmar Raiser Klaus Raiser GmbH Mönchswiesen 18 D-71735 Eberdingen Germany Tel No : +49 7042 88105-0 Fax No : +49 7042 88105-50 E-mail : info@raiser.de Website: www.raiser.de |
In 1972 Klaus Raiser had his initial introduction to a forge welding process, i.e. rotary friction welding (see animation[2] on their German WWW site). With an expert's eye he recognised the multitude of possibilities of this process. In 1974 the company was transferred to Eberdingen and, when moving into the modern factory, he purchased his first rotary friction welding machine.
The continuing professional development of the company led to an expansion of the production area and manufacturing spectrum. Raiser GmbH is now for example one of the leading manufacturers of linear friction welding equipment in Europe.
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Fig.1. Raiser's head quarters in Eberdingen[3] near Stuttgart © 2001, Raiser |
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Fig.2. Ice skating hall in Frankfurt-on-Main with rotary friction welded nodes [4] © 2001, Raiser |
The rotary friction welds can be compared with full penetration butt welds according to DIN 4100. The welding factor is assumed to be 1.0, i.e. an increase by 25% in comparison with conventional processes, which use a factor of 0.8.
The tubes are cut to length and are then joined to forged connection pieces using a purpose built rotary friction welding machine. Both components are made from St52-3 with diameters of 60.3 to 127mm and a wall thickness range of 2.6 to 12mm and a length of 6m.
The production is being conducted according to well-defined standards, and the pre-set data are monitored with a monitoring system keeping a record of each weld. Random samples are tensile tested during the production and their fracture has to occur in the parent material of the tubes.
| Welded Structures | Steel up to 20t |
| Robotic Welding | 6 axis Robot with turntables | Friction Welding |
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| Machine Shop |
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| Sand Blasting | 6000 x 4000 x 2500mm |
| Painting | |
| Flame Cutting | |
| Production of rotary friction welding machines, LinFric®[5,6] machines and purpose built machines | |
| Design of welded structures | |
| Welding Consultancy | |
| Approvals | DIN 18800 DIN 4099 (concrete reinforcements) ISO 9001 (quality management) |
| Metallography Laboratory | |
| 1. DECKEL FP4 NC, Year of Construction: 1989 Working Envelope X= 560; Y= 450; Z= 450 Suitable for Components of up to 200 kg |
| 2. DECKEL FP5 CC, Year of Construction: 1990 Working Envelope X =850; Y =600; Z =700 Suitable for Components of up to 400 kg |
| 3. DECKEL DMU 80P, Year of Construction: 1996 Working Envelope X =800; Y =700; Z =700 Automatic tilting head, NC round table 800 Tool changer for 60 Tools Suitable for Components of up to 800 kg Maximum Workpiece Size: 800 x 700 x 450 mm; Ideal for Machining 5 Sides |
| 4. REIDEN BF 5, Year of Construction: 1991 Working Envelope X=3000; Y=1000; Z=1500 Automatic tilting head Suitable for Components of up 6000 kg Maximum Workpiece Size: 3000 x 1000 x 1500 mm Ideal for Machining 2 Sides |
| 5. REIDEN BF 5, Year of Construction: 1991 Working Envelope X=4000; Y=1000; Z=2100 Automatic tilting head Suitable for Components of up to 6.000 kg Working Envelope: 4000 x 1000 x 2000 mm Maximum Workpiece Length: 12000 mm |
Copyright © 2001, TWI Ltd