techtech Posted September 15, 2009 Share Posted September 15, 2009 Hi All, Just interested in peoples views - trying to settle an argument. I think a weld is not as strong as a clamp. TT Link to comment Share on other sites More sharing options...
Brian Posted September 15, 2009 Share Posted September 15, 2009 What type of scaff clamp? Link to comment Share on other sites More sharing options...
techtech Posted September 15, 2009 Author Share Posted September 15, 2009 What type of scaff clamp? Ordinary scaffolders type I'd say Link to comment Share on other sites More sharing options...
J Pearce Posted September 15, 2009 Share Posted September 15, 2009 Locking swivel or fixed 90d? Is the welded Doughty the ali scaff welded to an omega clamp type boom arm? Link to comment Share on other sites More sharing options...
Sam_Lowers Posted September 15, 2009 Share Posted September 15, 2009 Below is a link to the Doughty Boom Arm:http://www.doughty-engineering.co.uk/shop/7/60/index.htm Every time I have used they I have found them fantastic! Link to comment Share on other sites More sharing options...
dunk_1984 Posted September 15, 2009 Share Posted September 15, 2009 Is the welded Doughty the ali scaff welded to an omega clamp type boom arm? I imagine he means these: http://www.doughty-engineering.co.uk/cgi-b...showprod_T57310 Tube welded to a half coupler. Get your calculator out and work out the force exerted at 1m. Or use someone's code: http://www.engineersedge.com/simple_levers_menu.shtml 90degree coupler can hold - 750kg - http://www.doughty-engineering.co.uk/cgi-b...showprod_T57102 Boom arm ratings - http://www.doughty-engineering.co.uk/shop/...iles/t57310.pdf Link to comment Share on other sites More sharing options...
Jamtastic3 Posted September 15, 2009 Share Posted September 15, 2009 Isn't it obvious (when thinking about a heavy load) that a weld isn't going to be as strong as a 90 degree clamp? Seem to be to me Link to comment Share on other sites More sharing options...
PoppaDom Posted September 15, 2009 Share Posted September 15, 2009 Isn't it obvious (when thinking about a heavy load) that a weld isn't going to be as strong as a 90 degree clamp? Seem to be to me Er......think about that statement! Link to comment Share on other sites More sharing options...
robloxley Posted September 15, 2009 Share Posted September 15, 2009 I go for option D: what are you doing for this to be an issue?? Link to comment Share on other sites More sharing options...
mumbles Posted September 16, 2009 Share Posted September 16, 2009 I'd go for option E, is either likely to fail before what youve attached it to? Link to comment Share on other sites More sharing options...
hadyn.williams Posted September 18, 2009 Share Posted September 18, 2009 Isn't it obvious (when thinking about a heavy load) that a weld isn't going to be as strong as a 90 degree clamp? Seem to be to me Umm, correct me if I'm wrong someone, but the weld itself is probably stronger that the aluminium it's holding together? Link to comment Share on other sites More sharing options...
AndyJones Posted September 18, 2009 Share Posted September 18, 2009 EXACTLY!! Link to comment Share on other sites More sharing options...
Simon Lewis Posted September 18, 2009 Share Posted September 18, 2009 Umm, correct me if I'm wrong someone, but the weld itself is probably stronger that the aluminium it's holding together? Perhaps. However, depending upon the aluminium alloy used, the metal in the heat affected zone next to the weld will be softened. The reduction in strength can vary from 20% to 80%. (Hind, P., 2001. p.18, Aluminium Structures in the Entertainment Industry, Entertainment Technology Press). Link to comment Share on other sites More sharing options...
bjkered Posted September 18, 2009 Share Posted September 18, 2009 The other way of thinking about it is Doughty give you a spec for their system. What is the Spec on a Clamp.!!! NO spec therefore Doughty WIN Link to comment Share on other sites More sharing options...
simantec Posted September 18, 2009 Share Posted September 18, 2009 The other way of thinking about it is Doughty give you a spec for their system. What is the Spec on a Clamp.!!! NO spec therefore Doughty WIN No Spec? Safe working loads for individual couplers Right angle coupler (Class A) Slipping force in kN 6.1 (1)Cruciform stiffness in kNm/rad 10.0 (2)Cruciform bending in kNm 0.24 (2) Right angle coupler (Class B) Slipping force in kN 9.1 (1)Cruciform stiffness in kNm/rad 15.0 (1)Cruciform bending in kNm 0.28 (1) Notes(1) These figures are based on table 8 of BS EN74-1 : 2005 and are for use with type 4 steel tubes(2) Data on crusiform strength and stiffness shall be obtained from the supplier / manufacturer Referance TG20:08 Link to comment Share on other sites More sharing options...
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