Markus,
Which hot air gun do you use?
Simon
On 5 Nov 2003, at 07:40, markuszingg wrote:
> --- In Homebrew_PCBs@yahoogroups.com, Adam Seychell
> <adam_seychell@y...> wrote:
>> This weekend I played around with my hot air welder again, trying
>> to get better practice. I bought three types or welding rod, and
>> small and large triangle type and a 3 mm round, each type comes
>> in 50 rods per pack. I found triangle is the best. For 4.5mm
>> sheet I use the larger triangle, for 3 mm sheet I use the small
>> triangle rods. Practice on lots of scrap pieces and then try and
>> break the weld when cooled. A ∗really∗ good weld will not break
>> at the weld, but rather the sheet its self will break. The trick
>> is to get the right temperature setting and nozzle distance from
>> the work piece. There is a fine line between burning the plastic
>> and not heating it enough to properly fuse. If the temperature is
>> too low then it takes too long to melt the plastic and so too
>> much heat transfers to the bulk of the material, which makes
>> everything deform and then you cannot push hard of the rod. If
>> the heat is too hot then it very easy to burns the plastic which
>> contaminates it with carbon and produces a weak weld.
>>
>> Adam
>
> Hi Adam
>
> The trick that I use is the hot air welding gun itself. It's
> temperature is automatically controlled and it is having a digital
> display showing the temperature which also can be used to set the
> temperature requested. It then takes the gun probably 10 seconds or
> so to reach a new temeparature level and it then stays there. This
> really helps a lot in getting consistent good results.
>
> Markus
>
>
>
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Simon Whitehead
s.whitehead@...