A Question for our Welder's/Fabricator's |
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A Question for our Welder's/Fabricator's |
76-914 |
Jun 8 2016, 01:38 PM
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#1
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,502 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
I've been trying to figure out how you guy's deal with shrinkage. Not for body panels but just general welding. (And no, I did not shrink my car when I installed the Engman Kit) As an example, let's say I'm welding on a 10' piece of pipe that will become a stair rail. Of course it turns 90' on each end and will have flanged ends that screw to the wall. If the 90' elbows are welded on then the length of the rail will shorten "x" inches. Can this be prevented with pre heating. If so, do you apply heat to the entire piece or just where the weld will be? Do you accept that shrinkage will occur and just do not drill any matching holes until after the weld? Is there a formula that adjusts for this shrinkage? Do you bolt it in place then weld to prevent shrinkage? Also, I don't remember this being a problem with gas welding but that was years ago. My imagination or not? TIA, Kent (IMG:style_emoticons/default/beerchug.gif)
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rick 918-S |
Jun 8 2016, 07:58 PM
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#2
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Hey nice rack! -Celette Group: Members Posts: 20,460 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
What these guys said. (IMG:style_emoticons/default/agree.gif) Specially Jeff when it comes to sheet metal and Barefoot gave you the average depending on wall thickness and application. Lots of tricks you learn by trial and error over the years.
Try this, biggest challenge of my shop life to date. Assemble by welding a complete shroud. 4 weld seams pulling in different directions trying force things out of square. Metal finish the welds and still be able to fit the hood without shrinkage. Tig welded, annealed, metal finished, Installed as one piece. From your aircraft days, 4130 is best gas welded to be sure the material naturalizes unless you have a big oven you can use. The fab shops and ship yard I worked in used jig tables for hand rail. Most of the time you can't be off or they don't install. (IMG:style_emoticons/default/unsure.gif) |
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