There is some discussion, it seems to be TIG brazing.........
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| Some beautiful welds.... http://www.kawi2strokes.com/forum/viewtopic.php?f=21&t=5347 |
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| Author: | Ja-Moo [ Fri Jan 04, 2013 2:05 pm ] |
| Post subject: | Some beautiful welds.... |
http://www.silverstonesuperbikes.co.uk/xr69_5.html |
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| Author: | Walms [ Fri Jan 04, 2013 2:12 pm ] |
| Post subject: | Re: Some beautiful welds.... |
The close up of the frame looks to be brazed... Very nice though!!! |
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| Author: | Jim [ Fri Jan 04, 2013 2:37 pm ] |
| Post subject: | Re: Some beautiful welds.... |
The description "NICKEL BRONZE WELDED" is another clue, but I think "welded" is not really correct if it was done with nickel bronze. I remember those photos from a previous thread somewhere. |
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| Author: | Ja-Moo [ Fri Jan 04, 2013 2:54 pm ] |
| Post subject: | Re: Some beautiful welds.... |
There is some discussion, it seems to be TIG brazing.........
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| Author: | oxford [ Fri Jan 04, 2013 3:04 pm ] |
| Post subject: | Re: Some beautiful welds.... |
I am not sure if it was that frame or not, but there were some similar pics floating around on the boards a while back. Here is a vid of it being done. I would assume that a tig torch could be used in place of the O/A. If the comments are correct, it tells the difference of brazing and bronze welding. http://www.youtube.com/watch?v=ZlLV0P6uGDw |
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| Author: | Walms [ Fri Jan 04, 2013 3:10 pm ] |
| Post subject: | Re: Some beautiful welds.... |
Yup, I had a total flash back when I saw the pic...  I also agree with Jim... Brazing is closer to soldering than welding imo. I'm not knocking it though, I believe the previous thread stated that this method was better than TIG welding... Not sure if I really see it though??? |
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| Author: | Jim [ Fri Jan 04, 2013 4:19 pm ] |
| Post subject: | Re: Some beautiful welds.... |
If the tubing being joined has a temper that would be adversely effected by the heat of welding, the lower temperature of brazing can sometimes prevent the problem. High-end bicycles in the heyday of steel frames had to be low temperature brazed because they used exotic steels with tempers that would be lost by welding. I have no idea if that might be the reason the motorcycle frame was brazed. |
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| Author: | Walms [ Fri Jan 04, 2013 4:48 pm ] |
| Post subject: | Re: Some beautiful welds.... |
Yeah, I sort of remember that rational... I just looked up the melting point of nickel bronze to be 1035-1055 deg c. This is well above the temperature that would effect the temper in the steel though... Wouldn't you agree? It obviously works, I'm just trying to understand why??? |
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| Author: | Jim [ Fri Jan 04, 2013 5:03 pm ] |
| Post subject: | Re: Some beautiful welds.... |
Maybe the heat of welding didn't change the temper as much as change the crystal structure in some other way. (?) The bicycle frames were brazed with a silver bronze alloy, but as you pointed out, I think even that stuff needed a temperature that would change a temper. I knew the guys in a frame building shop, and they had to get special training to braze the Reynolds tubing. (not the same Reynolds that makes Aluminum) |
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| Author: | oxford [ Fri Jan 04, 2013 7:17 pm ] |
| Post subject: | Re: Some beautiful welds.... |
I thought I read that it won't introduce some of the stresses to the steel that a true welding process would. |
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