Notices
Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

Flux?

Old 03-09-12, 06:12 PM
  #1  
Andycapp
Senior Member
Thread Starter
 
Andycapp's Avatar
 
Join Date: Aug 2011
Location: Puyallup, WA
Posts: 446

Bikes: Tommasini Super Prestige, Kamra Triathlee, Nishiki Tri-A equipe', Sakai 2000

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Flux?

So, I've got my tubing, lugs, and all the other bits and bobs. I also got some strait gauge 4130 from Spruce to practice with. I'll be shopping for my torch handle/tip this weekend. Question: The guy at the weld shop I was in earlier recommended a powder type flux called Marvel- "just dip the rod in there, works great!". Everything I'm reading/seeing shows you guys using a paste type (Harris?) and slathering it on pretty generously. Has anyone used this powder type? Results? Thumbs up or down?

-Andy
Andycapp is offline  
Old 03-09-12, 06:39 PM
  #2  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 20,112
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 527 Times in 389 Posts
I have used the powder type flux, and it's a pain to deal with. I used to use it for bridges and dropouts. You can actually turn it into a paste by pouring boiling water on it. At least he didn't try to sell you silver flux

I think the powdered fluxes are not all that great for you, I would go with Cycle Design
unterhausen is offline  
Old 03-09-12, 06:43 PM
  #3  
redtires
Extra Medium Member
 
redtires's Avatar
 
Join Date: Jul 2006
Location: Erie, Co
Posts: 1,851

Bikes: Cannondal CAAD8; custom build carbon HT 29er.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I've always used paste flux. It's true, the powder stuff is really a pain and it does not work very well in reducing oxidation and increasing flow like a paste does, in my own experience.
__________________
Droping the hamer since '86
redtires is offline  
Old 03-09-12, 06:46 PM
  #4  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 13,794

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2500 Post(s)
Liked 574 Times in 441 Posts
While brass/bronze is more forgiving of poor prep, cleaning and lack of flux and many just want to get the job done as fast as possible, these are no reasons to not follow best procedures. So most here will suggest that you prep well. Clean by sanding fully down to bright surfaces. Have your fit up as it needs to be, not almost right. And use flux on all brazing surfaces before starting to heat up. Powder won't stick to steel unless the metal is hot, and then the oxidation that flux helps prevent has already started. paste will stay put while heating up and by the time the water steams off the resulting powder will stick and do it's job. Which flux can be debated but many find the GasFlux company type B the best for brazing and clean up. I'll dip my warmed up rods directly into the paste as i feel the need to have more flux on the joint. I do have generic powdered flux and might sprinkle some on (just a pinch will do you) fillets if the flux is getting "old". As you get more proficient you'll find aspects that you can short cut but when starting do the full thing. Andy.
Andrew R Stewart is offline  
Old 03-09-12, 08:55 PM
  #5  
tuz
Senior Member
 
Join Date: Dec 2006
Location: Toronto/Montréal
Posts: 1,193

Bikes: Homemade mixte, track, commuter and road, Ryffranck road

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I use the Gasflux paste too, it's really great.

I've used generic powder a little bit too, but I thought it generated more glare under the flame, and didn't soak out very well in warm water. That being said, I don't see why the powder wouldn't work. It's the same as the paste basically, they are active in absorbing oxides at the same temp. range, i.e when it's already hot. I've seen some videos of Zullo and Pegoretti where they heat up the joint, then dunk it in a box of powder. Doesn't look like they use paste? Presumably the flux will flow before the filler to clean the metal ahead if you're sweating a socket... Gotta give it a shot one of these days.
tuz is offline  
Old 03-09-12, 09:01 PM
  #6  
Six jours
Senior Member
 
Join Date: Mar 2007
Posts: 6,401
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
I haven't been able to make powdered flux work for me. Harris flux is much more straightforward IMO.
Six jours is offline  
Old 03-09-12, 11:37 PM
  #7  
Andycapp
Senior Member
Thread Starter
 
Andycapp's Avatar
 
Join Date: Aug 2011
Location: Puyallup, WA
Posts: 446

Bikes: Tommasini Super Prestige, Kamra Triathlee, Nishiki Tri-A equipe', Sakai 2000

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
That's what I was expecting. Thanks guys.
Andycapp is offline  
Old 03-10-12, 11:10 AM
  #8  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 20,112
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 527 Times in 389 Posts
I forgot to mention that the powdered flux is apparently made of powdered diamonds, because when you try to take it off again you will have to use carbide tools to chip it. You can't even buy it around here anymore though
unterhausen is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
momo608
Framebuilders
6
01-02-16 04:07 PM
waterlaz
Framebuilders
8
01-19-14 07:43 PM
TickTockToe
Framebuilders
9
04-11-13 09:42 PM
Gdogpdx
Framebuilders
11
04-03-13 08:45 PM
daddybland
Framebuilders
7
02-17-11 05:16 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.