What gauge steel for frames? - Mountain Buzz
 



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Old 01-23-2015   #1
 
albuquerque, New Mexico
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What gauge steel for frames?

I'm considering building a welded steel frame for my raft, and I'm curious what size and gauge of steel round tubing folks have used for frames... I'd love to get it within 10-20lbs of my current aluminum pipe/speed rail frame, but I don't want to give up much strength or rigidity...

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Old 01-23-2015   #2
 
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Nearly all steel frames are made with 3/4" EMT thin wall conduit. The wall thickness is 0.049 in.
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Old 01-23-2015   #3
 
albuquerque, New Mexico
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I've definitely seen lots of conduit frames, but it sure seems to me that would be a major downgrade in strength...anyone making anything with proper tubing?
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Old 01-23-2015   #4
 
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Originally Posted by bigscottone View Post
I've definitely seen lots of conduit frames, but it sure seems to me that would be a major downgrade in strength...anyone making anything with proper tubing?
As an outfitter I owned somewhere around fifty frames, all made of 3/4" conduit, made by Cascade Frames and TMS Frames. I never had any problems with any of them, so I don't see any need for increased strength. All that would do is add weight.
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Old 01-23-2015   #5
 
Newberg, Oregon
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Nearly all steel frames are made with 3/4" EMT thin wall conduit. The wall thickness is 0.049 in.
One of my frames is made of 1" EMT Hard to bend with a manual conduit bender but plenty strong. I used a Mig welder then painted the frame. Brazing would be better but I not very good at it.
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Old 01-23-2015   #6
 
albuquerque, New Mexico
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Jpbay, do you have any photos of your frame? Thanks!
It looks like some of the commercial manufacturers are using 1 3/8"...
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Old 01-23-2015   #7
 
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You can get spray on galvanized paint at a welding supply place.

Is there something wrong with your speed rail frame, or are you adding a second frame to serve another purpose?
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Old 01-23-2015   #8
 
albuquerque, New Mexico
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Oarboatman, nothing in particular wrong with the frame (although I don't 100% trust speed rail set screws, even with locktight), but I like welding and DIY stuff, and I have all my gear dialed in and really like the idea of building it super specific and tight to my stuff/boat...
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Old 01-23-2015   #9
 
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Originally Posted by jpbay View Post
One of my frames is made of 1" EMT Hard to bend with a manual conduit bender but plenty strong. I used a Mig welder then painted the frame. Brazing would be better but I not very good at it.
Yeah, now that you say that, I think all of my frames were 1", not 3/4". My bad.
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Old 01-24-2015   #10
 
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Yeah, now that you say that, I think all of my frames were 1", not 3/4". My bad.
which is almost impossible to bend without a mandrel machine bender. Definately can't do it with an electricians step pipe bender ... don't even try with a harbor freight kinker ...
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