frame welded?

jvaug327

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Sep 2, 2017
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I’m attaching new rear seat brackets for a ‘67 single seat and found the old ones were brazed on which I assumed is why they broke off in the first place. While grinding this off it looked like the top of the shock bracket might have also been brazed as well. Is this a repair or were these brazed instead of welded? It looks like the cast head stock is oven brazed (not sure if that is the right term) while other joints appear to be welded. before I go any further can someone enlighten me, specifically the top shock mounts? Thanks.
 
Re;"Related to this , can mild steel be SIF bronze welded to reynolds 531?"

Yes
 
Just a foot note:
The brazing that was used by English race chassis builders was called “nickel bronze brazing”.
This is done with a jet flux added to you acetaline http://bbs.homeshopmachinist.net/threads/30193-Brazing-flux-supplied-with-acetylene.
This type of brazing as strong as a weld with out tempering the steel around it (110 Brinell hardness and 78,000 psi (538 MPa) tensile).
Contrary to popular belief, nickel bronze brazing rod is available in the States. It is sold by WA. Alloys spec# AWS A5.27
I have been using this rod in repairs to Lola, McLaren, and Crosley. It melts into the original Nickle Bronze without any rejection.
 
jvaug327 said:
I’m attaching new rear seat brackets for a ‘67 single seat and found the old ones were brazed on which I assumed is why they broke off in the first place. While grinding this off it looked like the top of the shock bracket might have also been brazed as well. Is this a repair or were these brazed instead of welded? It looks like the cast head stock is oven brazed (not sure if that is the right term) while other joints appear to be welded. before I go any further can someone enlighten me, specifically the top shock mounts? Thanks.
Click to expand...
Frames were brazed as brass will penetrate a forging or casting better, also easier and cheaper to show worker how to braze vs welding.
 
nortonbrian said:
Frames were brazed as brass will penetrate a forging or casting better, also easier and cheaper to show worker how to braze vs welding.
Click to expand...
Further to the above, Reynolds Technology Co. developed the R531 alloy specifically for bracing joints. They also advised against welding, as the higher temperature developed in this process will adversely affect material properties like tensile and ultimate stress as well as fatigue resistance.
-Knut
 
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