 Consensus on Lap Joint Weld Prep? |
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| bkrantz |
 Dec 17 2019, 09:45 PM
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#1
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914 Guru  Group: Members Posts: 7,842 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains 
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So based on experience and expert knowledge, what's the best way to prep metal for lap joints, especially with plug welds? No paint or treatment? Ospho? Weld-through primer? And what about seam sealant after welding before paint?
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| mb911 |
Dec 19 2019, 05:52 AM
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#2
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914 Guru Group: Members Posts: 6,972 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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The ban link is a good one.. Remember steel melts at 2750 a d no primer in the world can withstand it so naturally as it degrades in the weld area(HAZ) then it will contaminate the weld area..typical carbon steels have a range from 1008 to 1095 with carbon added to the iron to make each grade of steel.. The amount of carbon added is approximately .08%-.95% respectively.. Now if you add another carbon source then it changes the steel dramatically thus potential embrittlement to the steel.. The same thing can happen just by using some layout pencils and writting utensils..
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Posts in this topic
bkrantz Consensus on Lap Joint Weld Prep? Dec 17 2019, 09:45 PM
cary Metal : ?
Old on old ?
New on Old ?
New on new ?
... Dec 17 2019, 11:22 PM Literati914 Scuff to clean metal, then phosphoric acid, let dr... Dec 17 2019, 11:42 PM
bbrock
Scuff to clean metal, then phosphoric acid, let d... Dec 18 2019, 09:00 AM
FL 000
This was my process too. Only thing I'll ad... Dec 18 2019, 01:43 PM BeatNavy
(I've paid good money for Weld Thru primer th... Dec 18 2019, 04:06 PM Costa05 Definitely no expert here but I lap welded my fron... Dec 17 2019, 11:54 PM Tdskip UPol high zinc does not burn back much it at all i... Dec 18 2019, 11:18 AM cary I use the same U-Pol weld thru primer.
But it only... Dec 18 2019, 02:09 PM FourBlades Weld through primer is a misnomer in my opinion. M... Dec 18 2019, 02:49 PM Superhawk996 Just a generalized statement.
Avoid lap welds i... Dec 18 2019, 03:58 PM bretth Weld through primers I have used always contaminat... Dec 18 2019, 04:18 PM doug_b_928 I've been following a similar procedure to mos... Dec 18 2019, 04:21 PM rjames FCA Explains Ban on Weld-Through Primer Dec 18 2019, 08:27 PM doug_b_928 Here's a link to a discussion I had a couple o... Dec 18 2019, 09:38 PM bkrantz Thanks, everyone. Dec 18 2019, 11:06 PM |
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