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Old 01-19-2019, 12:55 AM   #11
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Is the pan steel or aluminum?

If it's aluminum then the whole thing might need to be heated and then cooled slowly. Just about anything cast gets cranky when brazed/welded.

If it's steel, I'm not sure what's going on, other than that there are a TON of residual stresses from stamping that are pulling it apart after what is basically localized heat treating. Also yes, you may be getting it too hot, and going past the upper critical temperature, where the carbon dissolves into martensite., and when it cools too rapidly in that state, it will definitely crack and be extremely brittle. Cooling slowly is the key. Though, similar things can (well, do) happen with welding too. This depends on a lot of what alloy of steel it is.

Given your pan is cracking and not the plug, the plugs weld-ability is fine.

Without being a super expert on welding/brazing, nor knowing exactly what the base materials are, I can only suggest slowly heating the whole piece, and slowly cooling it back down, I also think you may be getting it on the too-hot side of things.

Brazing is plenty relevant today, and a lot of materials are more easily brazed than welded as it doesn't melt the base material. The only difference between Brazing and welding is temperature.

Welding temperature is classified as any temperature high enough to melt the base metals together.

Brazing is done generally in the 1200°F-1600°F, so if you're getting the base metal hotter than a dull red, you're getting it too hot.

Soldering is a filler metal that is liquid below 850°F, basically low temp brazing.
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Old 01-19-2019, 10:14 AM   #12
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Everyone is a time traveler, just most people only know how to go one way.
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Old 01-19-2019, 04:43 PM   #13
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OK, so I went to a junk yard and a body shop and no one offered any advice on what was wrong with my brazing. But while at the junk yard I found a a4ld off a four wheel drive vehicle. I bought the pan off it for $40.00. It protrudes a few inches lower and now I'll put the drain plug into it. I found a really nice welder who welded it for only $10.00 but I gave him $20.00 because he was worth it. So, to put a drain plug in I paid $40.00 for two drain plugs, $40.00 for another pan, $20.00 for welder, plus running around just to get a drain plug installed, that's $100.00. I'll also need a different filter with the deeper pan.
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Old 01-19-2019, 05:32 PM   #14
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Did you ask the welder about your braze job?
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Old 01-20-2019, 06:39 AM   #15
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What he said



Also a couple of things that might help

1 there is a heat absorbing paste can't remember the name of it off hand but you can use it on the pan to help keep it from cracking.



2 you need a paste flux


3 when brazing 2 dissimilar metals like steel and brass you need a rod with a higher silver content I believe.


4 if you are getting material dull red it can get too hot very quickly



5 rod should follow the heat and flow into the joint any excess material from the rod does not make it any stronger and is just waste



https://www.lucasmilhaupt.com/NA/EN/...ndamentals.htm


https://www.google.com/url?q=http://...AG-8RSzw8lHTFH


Couple of links that might help you
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Old 01-20-2019, 08:04 PM   #16
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I did everything I think I'm supposed to do. I did use a paste flux and a flux coated filler wire. The cracks I got in the pan are called, based on what I read, liquid metal embrittlement. I think I got the pan metal too hot. Thanks for all the information.
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Old 01-20-2019, 10:01 PM   #17
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I did everything I think I'm supposed to do. I did use a paste flux and a flux coated filler wire. The cracks I got in the pan are called, based on what I read, liquid metal embrittlement. I think I got the pan metal too hot. Thanks for all the information.
you do know you can buy bolt in from auto part store!
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Old 01-21-2019, 01:15 AM   #18
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Those things come with a 100% leak guarantee.
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Old 01-21-2019, 10:59 AM   #19
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Originally Posted by croatankid View Post
I did everything I think I'm supposed to do. I did use a paste flux and a flux coated filler wire. The cracks I got in the pan are called, based on what I read, liquid metal embrittlement. I think I got the pan metal too hot. Thanks for all the information.

Keep heat primarily on the plug not the pan and heat evenly



It is easier to show then to explain
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Old 01-21-2019, 08:33 PM   #20
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I checked on the bolt in drain plugs. The reviews weren't so good. People complained about leaking and the plug pulling apart as they were being tightened. Plus, the bolt in type stood up higher inside the oil pan thus allowing more fluid to remain inside the pan.
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