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> Why not "braze" reinforcements on?, info from the "Welder's Handbook"
SpecialK
post Oct 3 2004, 11:57 PM
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I was re-reading my copy of Welder's Handbook because my practice welds on some scrap were weak as hell when trying to weld 18ga to some 12ga (rosette welds) to beef-up my seatbelt attach points that rusted out. (IMG:style_emoticons/default/headbang.gif) Needed a break (IMG:style_emoticons/default/beer.gif) to do some research and find out what I was doing wrong.

The author, Richard Finch, is big on brazing automotive sheetmetal repairs as opposed to fussion welding (MIG, Arc, etc.), particularly when it involves pre '80 cars that weren't assembled using HSS (High Strength Steel). He says that the high temps involved in fussion welding actually weakens the surrounding metal, where as the lower temps involved in brazing doesn't. You can't braze butt joints like you'd use to attach outer body panels, but the reinforcement kits like Mark's (Engman) inner long stiffener's and Brad's 10ga beasts would actually be much stronger (at the attach points). His example is taking 1" x 5" long strips of .060" mild steel, overlapping the ends by 1" and brazing them together. In a pull-test machine it takes over 3000 lbs. to pull them apart and it's always the base metal that breaks, never the brazed joint. Since lap joints are the preferred joint when brazing, and all of the weld points (holes) on the reinforcements are essentially lap joints, wouldn't it make sense to braze in the stiffeners rather than MIG weld?

Or then there's always the possibility that everyone does braze their stiffeners in, and I'm just assuming they've been MIG'd (IMG:style_emoticons/default/slap.gif)


Kevin
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Posts in this topic
SpecialK   Why not "braze" reinforcements on?   Oct 3 2004, 11:57 PM
scott thacher   IIRC the front post where the dorr hinges bolt to ...   Oct 4 2004, 01:09 AM
John Kelly   "The author, Richard Finch, is big on brazing auto...   Oct 4 2004, 07:34 AM
ArtechnikA   interestingly, Carroll Smith is big on "nickel-bro...   Oct 4 2004, 08:11 AM
lapuwali   Bronze welding, which is often called brazing in t...   Oct 4 2004, 09:21 AM
bondo   Brazing in theory would be great for a stiffening ...   Oct 4 2004, 10:41 AM
balljoint   While removing paint and filler layers from my car...   Oct 4 2004, 11:21 AM
bondo   One thing worth noting... it is VERY difficult to ...   Oct 4 2004, 11:58 AM
SpecialK   I've done quite a bit of "silver soldering", b...   Oct 4 2004, 12:01 PM
LvSteveH   There is no comparison between proper mig welding ...   Oct 4 2004, 01:37 PM
Sammy   Brazing does not bond like conventional tig or mig...   Oct 4 2004, 02:25 PM
SpecialK   Well it appears that the general consensus is braz...   Oct 4 2004, 03:29 PM
TimT  
QUOTE
  Oct 4 2004, 03:37 PM
SpecialK  
  Oct 4 2004, 03:43 PM
dmenche914   Up the heat some (higher amps) and place a big blo...   Oct 4 2004, 03:51 PM
SpecialK   A guy I work with suggested upping the hole size i...   Oct 4 2004, 04:25 PM
Racer Chris   The type of rosette welds you are trying to accomp...   Oct 4 2004, 04:45 PM
SpecialK   Yep Chris, I've pretty much scrapped the brazi...   Oct 4 2004, 05:54 PM
Racer Chris   ...   Oct 4 2004, 05:59 PM
Brando   Big Fucking Hammer? I love that test! In all ...   Oct 4 2004, 09:20 PM
John Kelly   One of the problems with flux core is the lack of ...   Oct 5 2004, 06:41 AM
SpecialK  

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