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Stud Welding: Small, lightweight & powerful Nelweld N800i The Nelweld N800i The N800i inverter stud welder from Nelson Stud Welding weighs only 19Kg but has enough power to weld up to M12 studs. The N800i is capable of welding in Drawn Arc, Gas Arc and Short Cycle processes. With the latest innovations, a two year warranty and one man portability… Why consider anything else? Nelson Stud Welding UK 47/49 Edison Road, Rabans Lane Industrial Estate, Aylesbury, Buckinghamshire. HP19 8TE. UK Tel: +44(0)1296 433500 Fax: +44(0)1296 487930 Email: enquiries@nelson-europe.co.uk Or visit our web site: www.nelson-europe.co.uk EN ISO 9001 VDA 6.1 zertifi ziert For demanding applications • Prevents loosening caused by vibration and dynamic loads • Locking function is not affected by lubrication • No special tools required • Reusable • Tension makes the bolt self-locking Since the cam angle ‘a’ is larger than the thread pitch ‘ß’, the pair of washers expand more than the corresponding pitch of the thread. NORD-LOCK Ltd. • Room 9, Main Building, Aspire Business Centre Ordnance Road, Tidworth, SP9 7QD United Kingdom Tel +44 (0) 1980 847129 Fax +44 (0) 1980 847674 Email: enquiries@nord-lock.co.uk Website: www.nord-lock.com
Meeting the aesthetic demands of the designer Long bond lines, typically found between a deck and a hull of a yacht, can experience extreme torsional loads Industry today has many elements where the colour of the structural adhesive is paramount. With so many products in marine, vehicle manufacture and construction being white, the aesthetic demands of designers and engineers require the adhe- Adekit A236 has a short initial hardening time of 4 hours sive to be the same colour. This was mainly due to improve or reduce the clean-up process after assembly but now a neat fillet along the bond line is acceptable and requisite. Whereas white or clear single part mastics have been common place for some years to reduce movement between panels and frames, the emergence of a white structural adhesive has been necessary for structures requiring greater integrity. This causes the manufacturer some logistic problems in the production line. White epoxy types are rare; they are rigid and take a long time to cure before handling is possible. Methacrylates are too quick and have unpleasant odours which permeate the work place. When using methacrylates, it is difficult to create a clean edge as they enter the initial polymerisation phase. The continued demand to bond dissimilar materials together means that the bond requires greater elongation or flexibility to cope with the different coefficients of expansion between the substrates being used. In the previously mentioned Industries, materials bonded are usually aluminium to GRP, or where long bond lines of GRP are bonded to GRP, typically between a deck and a hull where extreme torsional loads are experienced. The need for high elongation prevents the use of a stiff epoxy adhesive and methacrylates are too fast to allow assembly. Another advantage that the PU structural 1:1 adhesive has over 5:1 methacrylate adhesive is in its receptiveness to primers and paints, by not having a tacky like quality in the immediate time after curing. FAST OCTOBER 2011 FASTTOP TIPS Aesthetic demands of the designer often require the adhesive to be white The introduction of Adekit A236 developed from the very successful marine adhesive for the bonding of composites XP3550, combines the features of a long open time of 40 mins with a short initial hardening time of 4 hrs. The adhesive is available in 400ml cartridges or in bulk for machine dispensing. With a final cure overnight, the product has a high gap fill greater than 30mm and is white. Lap shear strength on abraded aluminium is 14 Mpa with an impressive 60% elongation at break, making the Adekit A236 a prime candidate for applications with high vibration, severe torsional movement, long bead lines, and where the adhesive really does need to be white. AXSON 01638 660062 53
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