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Light weight built-up beam made with Trib-Joins

APPLICATION NOTE: 8.

Light-weight beams assembled with Trib-joins offer maximum strength-to-weight ratio and are easily assembled on site. They exploit a unique load sharing property of Trib-joins which reduces the likelihood of individual struts becoming overloaded. This ensures optimum performance in applications ranging from decorative stainless or aluminium lighting gantries to high strength parts made in heavy gauge steel for say articulated lorry trailer chassis members or load bearing structural beams in bridges or buildings.

Trib joins are made with Trib-Tools,  these mildly abrade and clean the surface as they release trace amounts of cold welding agent that becomes absorbed into the oxide. This creates very high friction between rubbing pairs of surfaces on interfering metal parts as one is forced into another. 

In the illustration below wrapped, spun or turned bungs are forced into each end of spacer tubes set between two "U" channels. Twisted tensile cross braces are trapped between the channels and tubes. The cross tubes need to have the  weld bead removed from inside the tube -if the tube is of welded construction.

 Conventionally built up beams are made by fusion welding with cross brace joins in tension, which are vulnerable to fatigue. Fusion welds modify metallurgical structure, thus they are usually oversized for safety. Problems are worse in beams using welded lightweight tubular components where cooling cracks or thinned wall sections near the critical high stress junction create many engineering uncertainties. But a tubular column withstands the maximum Euler (buckling) load, an advantage utilised to the maximum in the beam shown since the friction joins can yield without any loss of strength. Thus subtle adjustment may occur between individual joins as the beam is first loaded to optimise loads within the beam.

In its simplest form a beam may be assembled be tapping the bungs into the cross tubes with a mallet or by using hydraulic clamps for large joins. The use of Trib joins in tubular structures are discussed further in Application Notes 1 and 3  and is discussed in the Questions and Answer dialog.

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for more information email: info@tribtech.com

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The TribTech name derives from  "tribos" - Greek for 'rubbing'. 'TribTech' is a trade name used by Ball Burnishing Machine Tools Ltd. Registered Office 12 Brookmans Av. Hatfield, Herts. AL9 7QJ. United Kingdom;  Company Reg. No. 1408807, VAT Reg. No. 421 6210 04; a knowledge based company that develops, patents and licenses technology based on aspects of  tribology, the science of surfaces. All rights reserved by Ball Burnishing Machine Tools Ltd. Last modified: 29th Sept 2016 copyright 1999/2016. The information and data provided herein should be considered generally representative for the tools and technologies described. In all cases users should carefully evaluate the tools and technologies to determine their suitability for a particular purpose. Be aware this site uses cookies, your continued use implies you accept these.