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  #1  
Old 01-03-2018, 03:28 AM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 535
Default max temp of proseal

i need to have aluminum welding done close to an inspection hole in a fuel tank. the inspection hole doubler and nutplates are sealed with flamemaster. a call to the mfgr. was an exercise in futility. i can't find any info in the msds sheet. i am wondering what the max temp is i can heat the area to without damaging my sealant. any info is appreciated.
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dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12.
RV-12 kit as of 9/13
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  #2  
Old 01-03-2018, 04:48 AM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 927
Default What are you welding?

I'm not sure what your welding, but the RV tanks are made from 2024 (welding not recommended for 2XXX series aluminum)..but you can make a heatshield per say for the nutplate area with some water soaked rags or paste insulation. TIG/MIG welding doesn't create as much heat as torch welding. I have seen Proseal handle some pretty good heat, but do not have factual temperatures.
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  #3  
Old 01-03-2018, 06:17 AM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
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Default

not a van's tank. my own design. 5052 aluminum, very weldable. the welds will be 4-5'' from proseal and not a continuous weld. spot 1/2'' skip a couple inches etc. i was thinking about a wet towel and my take on it is that will work but would like to see any opinions.
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Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12.
RV-12 kit as of 9/13
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  #4  
Old 01-03-2018, 09:31 AM
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az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,630
Smile

Here's a typical data sheet. Intermittent exposure to 275F max.

http://www.ppgaerospace.com/getmedia...40_class_b.pdf
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Half completed RV-10 QB purchased
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  #5  
Old 01-03-2018, 11:04 AM
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grubbat grubbat is offline
 
Join Date: May 2012
Location: Ga
Posts: 564
Default Proseal

I can not fathom a worse smell that the smell of burning proseal while attempting to weld a piece of alum. Itís kinda hard to describe. You will definitively remember it though.
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RV-3 Sold
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  #6  
Old 01-03-2018, 11:56 AM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 535
Default

thanks gil, looks like i can make this work.
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Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12.
RV-12 kit as of 9/13
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  #7  
Old 01-03-2018, 01:44 PM
Ron B. Ron B. is offline
 
Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
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Can you have a wet cloth or something over the proseal area to keep that cool while welding?
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  #8  
Old 01-03-2018, 02:50 PM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 535
Default

yep, with a working temp way above boiling i can keep it cool enough with a wet towel. welder says it probably won't even get too hot to touch in that area.
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Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12.
RV-12 kit as of 9/13
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