Clevis failure
08-10-2015, 06:24 PM
#2
I've had a few break on me over the years CARSII... some dubro, some sullivan... sometimes they're just too brittle; not tempered properly after heat treating... I see in your photo some corrosion on the inside of the clevis, close to the point where it was soldered onto the metal rod... if you used acid based flux to solder those on, and didn't thoroughly wash the flux residue away, then over the years corrosion just set in... when you use an acid based flux with solder, after soldering the clevis on, use some baking soda mixed in some water and scrub the soldered ends with it using an old toothbrush... about a tablespoon to 4 ounces of water, scrub it well and rinse it off well, and dry it off with some "can of air" or paper towel.
John M,
John M,
08-12-2015, 01:02 PM
#4
My Feedback: (6)
Cars ll
From you picture it looks like acid core solder was used, hence the corrosion, and then the failure, Ie: insufficent cleaning after the joint was made, Back in the hand soldering days in electronics cleaning was the biggest problem as it caused the most failures.
Please don't take this wrong it's just something we saw a lot of back when I worked in the industry a sign we had in one of our shops
said CLEAN THEN CLEAN IT AGAIN.
One more thing even rosin in solder and the kind you add by hand can and will do the same thing, just not as quick.
Now I will go back and lay down by my dish
Cheers Bob T
From you picture it looks like acid core solder was used, hence the corrosion, and then the failure, Ie: insufficent cleaning after the joint was made, Back in the hand soldering days in electronics cleaning was the biggest problem as it caused the most failures.
Please don't take this wrong it's just something we saw a lot of back when I worked in the industry a sign we had in one of our shops
said CLEAN THEN CLEAN IT AGAIN.
One more thing even rosin in solder and the kind you add by hand can and will do the same thing, just not as quick.
Now I will go back and lay down by my dish
Cheers Bob T
08-12-2015, 04:45 PM
#5
Bob, you and I are on the same page; you must be from the old school !
You can get pockets in the solder wick that trap the acid flux; best way to stop that from happening is to super clean the metals, and with proper heat management, the solder wicks in with100% penetration... I use to do a lot of metal work back when I was an apprentice; learned a lot from the old boys like you and I... shame we don't have apprenticeships anymore... they can't learn everything from the internet, or by reading a book, they need hands on experience taught by someone with experience (hand me down knowledge)
John M,
You can get pockets in the solder wick that trap the acid flux; best way to stop that from happening is to super clean the metals, and with proper heat management, the solder wicks in with100% penetration... I use to do a lot of metal work back when I was an apprentice; learned a lot from the old boys like you and I... shame we don't have apprenticeships anymore... they can't learn everything from the internet, or by reading a book, they need hands on experience taught by someone with experience (hand me down knowledge)
John M,
08-12-2015, 08:13 PM
#8
My Feedback: (6)
John
Back when I was lead mfg engineer at the beginning of the Apollo ground support program, we had to help develop the wave soldering machine's the first one's were flat and would leave a lot of things to tor hand tuchup and that is ware we did the 5 deg angle and a duel wave, and I do remember a flux that was yellow, but my memory banks are not what they used to be ,
then to vapor faze soldering and just be for I left the industry we were working with infer red units.
Being sharp is just "Use it or Lose it", so I am always tinkering for my own satisfaction, and I still work part time to pay for the hobby and talk to people but the body is telling me I am full of it as you can tell from my rant.
Cheers Bob T
Ps f we don't quit the fun police will be after us. He He
Back when I was lead mfg engineer at the beginning of the Apollo ground support program, we had to help develop the wave soldering machine's the first one's were flat and would leave a lot of things to tor hand tuchup and that is ware we did the 5 deg angle and a duel wave, and I do remember a flux that was yellow, but my memory banks are not what they used to be ,
then to vapor faze soldering and just be for I left the industry we were working with infer red units.Being sharp is just "Use it or Lose it", so I am always tinkering for my own satisfaction, and I still work part time to pay for the hobby and talk to people but the body is telling me I am full of it
as you can tell from my rant.Cheers Bob T
Ps f we don't quit the fun police will be after us. He He
08-12-2015, 09:54 PM
#9
LoL, well working on the Apollo program / engineer, tells me all I need to know about you... I agree, "use it or loose it", you're one up on me Bob, and doing very well indeed... that's why I keep at this hobby to keep active... I too still work, out of my garage as a part time auto mechanic... worked at a dealership for many years, then in 2008 the crash just dragged us down, so I went my own way... works out better as I can set my own hours.
Here in California, they (the epa) tried using lemon juice as a flux on none critical circuit boards, game, sound systems, etc... it failed miserably, because the lemon juice would wick up the legs of capacitors and just get in places where it would not rinse out properly... circuits failed from corrosion to the point the components actually fell off the board... the new surface mount technology took care of that problem.
Never stop having fun !!
John M,
Here in California, they (the epa) tried using lemon juice as a flux on none critical circuit boards, game, sound systems, etc... it failed miserably, because the lemon juice would wick up the legs of capacitors and just get in places where it would not rinse out properly... circuits failed from corrosion to the point the components actually fell off the board... the new surface mount technology took care of that problem.
Never stop having fun !!
John M,
