[python] Re: another newbee

At 10:24 26.06.2004 +0800, you wrote:
Jürgen Mages wrote:

Hi Ralf,

welcome to our mailinglist.



I plan to build the bike from stainless
steel tubes, as I could get them with small wall thicknesses and they are
easy to weld with my TIG station.


Hope to hear from your project soon. I wish, I had a TIG machine ...

Regards from Jürgen.

To Jürgen and the other wishful TIG welders:

My "TIG station" is an old Migatronic 140 amps electrode inverter, which I got for free from a welding machine dealer as the power stage of it was burnt out. I repaired it and fitted a remote control pedal for the welding current, which I find essential for thin-walled tubing work (I am neither trained nor very experienced as welder). It has only touch ignition, so either I make acrobatic moves with a piece of copper to do ignition on this (who could breed humans with three or four hands?) or use quiet a lot of tungsten elektrodes... But it works. I will probably get another station with RF ignition in automn, which will make the job easier.
You could get an italien electrode/TIG station for about 600 ?, you'll just have to get an Argon bottle and pressure regulator. I would go for it, but this dealer mentioned above keeps giving me his hopeless cases, sometimes I succeed repairing them. So there's no need to spend money on welding machines, I better spend it on bikes...

Greetings

Ralf



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Hello Ralf
Im slow reading my messages.
What type of stainless steel are you using? Stainless steel work hardens and can lead to catastrophic failure.
I does Tig weld beautifully though.

Hello Colin,

thanks for pointing out the work-hardening properties of stainless steel. I was not aware this could be a problem. I asked two material engineers if bicycle framework done in low-carbon steel (St37 in Germany) could be done in stainless steel as well. Their answer was YES. I will investigate this problem further.
I would use either 316 Ti (also known as 1.4571) or 308 stainless steel tubing, the kind used for UHV components. In this field one could get BIG diameters (~80mm) with still 1 mm wall.


Greetings

Ralf

PS. It was the catastrophic, simultaneous failure of the two front fork blades (CrMo steel) of my upright bike which led to considerable headache, a serious black eye and the purchase of my first recumbent bike... I never wanted to crash face first on the street again.

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