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Heat shrinking
Hello all, I am shaping a small panel that has a flange, the panel is distorted and I believe the flange needs to be shrunk. I don't want to mark up the flange, so I thought I would use a propane torch and an infra red temp. gun. My question is what is the lowest temperature that you can use and still get shrinking action.
Thanx, Tom |
#2
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Quote:
I'd say that you ignore the gun and apply the warm with your air-propain flame until the metal is blue/purple - about the minimum heat for this, assuming your metal is steel. When hot then pat down with flat face on flat dolly/back up bar - hard wood is fine.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#3
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Kent, thanx for the response, I was just trying to do the least amount of trauma to this panel and exercise the maximun control. My first attempt, I use a heat gun and turned the flange a medium brown color. It was too slow and uneven, my next attempt I used a shrinking disc, the flange heated up to a blue color (500+ degrees?), the flange shrunk and most of the distortion was removed from the panel.
IMG_20180903_120841.jpg IMG_20180903_121003.jpg Last edited by Steve Hamilton; 09-04-2018 at 08:30 PM. |
#4
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Hi Tom, Lowest heat for shrinking sheet of thickness <.063, that I have successfully tested for, is no color but when the sheet has swelled to its max. You can see the various heat colors -I hope - in this chart, below. The purp-blue is one of my favorite low-temp colors, for hot shrinks on mild steel. (Helps a lot of your color-perception is good ... ) Low temp color chart.pdf Hope this shows up ...
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. Last edited by crystallographic; 09-05-2018 at 12:00 PM. |
#5
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Shows up fine, thanks.
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Dave |
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