Homebrew PCBs

roel_cnc wrote:
> --- In Homebrew_PCBs@yahoogroups.com, Markus Zingg <m.zingg@n...> 
> 
> To Markus,
> Why are the anodes bagged/enveloped with clothes!
>  
> i did try that welding part on some hobby glas and pvc sheets with no 
> luck at all- even after a week or 4 no real (strong)rigid weldings 
> are posible.
> I created me a vacuum unit - that do the job perfect :))
> 
> gr. Roel 
>
Then you must not have been using either the correct type of 
welding rod, hot air nozzle shape, hot air temperature, 
welding technique or preparation of the joining surfaces.
It does take a fair bit of practice to get a basic weld, 
(similar to the leaning curve of soldering in electronics) 
but then it takes a lot more practice to make it 100% 
strong, i.e. welds stronger than the base material.

Some good information on hot air plastic welding can be 
found here;
http://www.tempatron.co.uk/pdf_files/Principles.pdf