 A Question for our Welder's/Fabricator's |
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| 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 
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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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| Andyrew |
Jun 8 2016, 02:54 PM
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California
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Shrinkage isnt typically something that is factored into welding as its pretty small. If that is an issue then most of the time manufacturers use jigs to ensure that the panels remain the size then need to be by affixing the ends of the project.
Warping is however an issue and is rectified by making small tac welds vs long welds. |
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| mb911 |
Jun 8 2016, 03:09 PM
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#3
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(Andyrew @ Jun 8 2016, 12:54 PM)  Shrinkage isnt typically something that is factored into welding as its pretty small. If that is an issue then most of the time manufacturers use jigs to ensure that the panels remain the size then need to be by affixing the ends of the project. Warping is however an issue and is rectified by making small tac welds vs long welds. Correct and I am a welding instructor and confirm the above statements |
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| 914_teener |
Jun 8 2016, 05:50 PM
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#4
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914 Guru Group: Members Posts: 5,198 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
QUOTE(mb911 @ Jun 8 2016, 02:09 PM) QUOTE(Andyrew @ Jun 8 2016, 12:54 PM) Shrinkage isnt typically something that is factored into welding as its pretty small. If that is an issue then most of the time manufacturers use jigs to ensure that the panels remain the size then need to be by affixing the ends of the project. Warping is however an issue and is rectified by making small tac welds vs long welds. Correct and I am a welding instructor and confirm the above statements Sort of ageee...... During heating and cooling cycles metal goes through a tranny phase.......yes thats right....and we.re not talking bathrooms here. Fixtures don.t address residual stress induced by rapid cooling as you coin ad shrinkage. On my cellphone and train so I could further the explanation if anyone's interested. Love the George post (IMG:style_emoticons/default/av-943.gif) |
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Posts in this topic
76-914 A Question for our Welder's/Fabricator's Jun 8 2016, 01:38 PM
ssuperflyoldguy
I've been trying to figure out how you guy... Jun 8 2016, 01:56 PM Optimusglen I don't claim to be an expert, but I've do... Jun 8 2016, 02:08 PM
mb911
[quote name='mb911' post='2356647' date='Jun 8 20... Jun 8 2016, 06:00 PM Chris H.
I've been trying to figure out how you guy... Jun 8 2016, 03:19 PM r_towle
I've been trying to figure out how you guy... Jun 8 2016, 08:21 PM Chris H.
[quote name='Chris H.' post='2356649' date='Jun 8... Jun 9 2016, 08:52 AM Jeff Hail Shrinkage happens and yes you have to anticipate i... Jun 8 2016, 06:29 PM cary
I always remind guys that's why a MIG has a t... Jun 8 2016, 08:11 PM barefoot With automatic TIG welding on heavy wall tube/pipe... Jun 8 2016, 06:47 PM rick 918-S What these guys said. :agree: Specially Jeff when ... Jun 8 2016, 07:58 PM 76-914 Jeff, Rick & Barefoot; thank you very much. An... Jun 9 2016, 08:32 AM veekry9 RPgb77Ruz7g
https://www.youtube.com/results?search... Jun 9 2016, 08:39 AM 76-914 Unfortunately I was born with shrinkage ,Chris :r... Jun 9 2016, 09:34 AM worn I think you heard from the experts. The basic prob... Jun 9 2016, 12:09 PM 76-914 That makes perfect sense. The more I learn about w... Jun 9 2016, 03:44 PM |
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