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Author: Subject: Flux for soft soldering stainless steel
wg48temp9
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[*] posted on 10-7-2021 at 07:43
Flux for soft soldering stainless steel


From patent US3660127A a few examples of flux for soldering stainless steel, most examples use OTC materials. I have not tried any of them yet.

SS-flux-Capture.JPG - 161kB

and just incase your google is broken the patent is at: https://patents.google.com/patent/US3660127A/en




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[*] posted on 10-7-2021 at 21:14


Ummm. Anodize the stainless in a copper sulfate solution, when the stainless turns black, reverse the polarity and plate out copper on the stainless steel. Rinse, dry, flux and solder. Should be no problem.

Strength of bond? I don't know.
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draculic acid69
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[*] posted on 11-7-2021 at 01:04


Strength of bond is probably not going to be very strong. For structural integrity I'd guess no good, for electrical connection yeah it might hold. just get it welded.
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[*] posted on 11-7-2021 at 01:09


Quote: Originally posted by zed  
Ummm. Anodize the stainless in a copper sulfate solution, when the stainless turns black, reverse the polarity and plate out copper on the stainless steel. Rinse, dry, flux and solder. Should be no problem.

Strength of bond? I don't know.


Generally in electroplating practice they go to a lot of trouble to clean the part and in particular to remove surface oxide. So anodising the SS first seems like a terrible idea to me.





I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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wg48temp9
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[*] posted on 11-7-2021 at 01:36


Quote: Originally posted by draculic acid69  
Strength of bond is probably not going to be very strong. For structural integrity I'd guess no good, for electrical connection yeah it might hold. just get it welded.


Yes TIG welding is the way to go if the distortion is not significant. but my TIG welding skill is terrible. But it is getting better but slowly. After getting zinc fume fever a few times from practicing with zinc plated steel I have not had much practice. I need a fume extraction welding table. in effect an upside down fume hood LOL






I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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[*] posted on 12-7-2021 at 00:35


thats what tig welding is for



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[*] posted on 12-7-2021 at 02:19


Quote: Originally posted by wg48temp9  
I need a fume extraction welding table.


Nah, all you need is clean steel. Zinc will f*ck up both you and your weld.




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wg48temp9
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[*] posted on 12-7-2021 at 12:14


Quote: Originally posted by Fulmen  
Quote: Originally posted by wg48temp9  
I need a fume extraction welding table.


Nah, all you need is clean steel. Zinc will f*ck up both you and your weld.


Having been, as you put it f*cked up, (flue like symptoms) by inhaling an estimated few mg of zinc oxide dust a few times, I am going to take the advice of many including mine and take precautions to avoid inhaling any welding fumes.

Ideally I want a positive pressure welding helmet. I do have an auto darkening mask (best thing since sliced bread LOL) Since being given a battery powered vacuum cleaner, I have considered using its blower to supply clean air to a hood I will have to attach to my mask.




I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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[*] posted on 12-7-2021 at 12:46


Honestly, it's not that hard. None of your suggestions are bad, far from it, but they aren't necessary as long as you stay away from plated metal. You can't weld through it, and grinding the metal clean presents another source of exposure.

I've been TIG-welding a fair bit of stainless the last few months, most of the time I don't even bother turning on the extraction fan (I do for cutting and grinding).
Now if you're also using MIG or stick some smoke control is required so why not do it right from the start. Just saying you can do TIG without it.





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[*] posted on 29-7-2021 at 05:26


Hydrochloric acid and zinc chloride in combination with a silver bearing solder work pretty good on soldering stainless. Surfaces must be cleaned abrasively beforehand to remove most of the oxide coating. I have not had much of a success with phosphoric acid based concoctions.
Electrolytically etched surfaces can sometimes be notoriously difficult to solder, so I would stay away from that path.

Of course nothing beats TIG welding....it is a wonderful method for joining basically all known alloys. Nowadays machines are very compact and have a plethora or modes to perform quite the magic on precision melting of metals.

[Edited on 29-7-2021 by markx]




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[*] posted on 7-8-2021 at 02:31


Stick or arc welding with stainless rods is a no brainer and ensures adequate 'penno' on the weld (thats penetration for all you welding jargon ignooramiuses!).
Problem is doing any fine work, fuck no.
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[*] posted on 8-8-2021 at 00:29


Quote: Originally posted by Panache  
Stick or arc welding with stainless rods is a no brainer and ensures adequate 'penno' on the weld (thats penetration for all you welding jargon ignooramiuses!).
Problem is doing any fine work, fuck no.


Unfortunately its mostly fine work joining SS vacuum flanges to SS tubes with wall thicknesses from about 0.5mm to 2mm with diameters of 25mm to 100mm. With my skill level it will not be possible with stick welding, a bit like trying to weld a car body with a stick welder. It has to be MIG or TIG.




I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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Panache
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[*] posted on 8-8-2021 at 15:53


Quote: Originally posted by wg48temp9  
Quote: Originally posted by Panache  
Stick or arc welding with stainless rods is a no brainer and ensures adequate 'penno' on the weld (thats penetration for all you welding jargon ignooramiuses!).
Problem is doing any fine work, fuck no.


Unfortunately its mostly fine work joining SS vacuum flanges to SS tubes with wall thicknesses from about 0.5mm to 2mm with diameters of 25mm to 100mm. With my skill level it will not be possible with stick welding, a bit like trying to weld a car body with a stick welder. It has to be MIG or TIG.


Oh ive got a box of new stainless vacuum flanges and other associated high vacuum miscellleana, if you want them you csnhave them, let me know and I will post photos, theres a bunch of various parani gauges. (Sorry not gauges just the detectors) some flanged through electrical shit etc.
It was all new parts gotten from the thermo fischer waste bin...they love buying companies, closing them down and throwing all the parts!
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[*] posted on 13-8-2021 at 03:28


And here’s a group shot omitting the 576478548(it’s probably not that many),annealled, individually packaged, copper seal rings in the various sizes.
I’m in Melbourne Australia though....there’s also all those piraña ( detectors if you want some ...the thread is in the materials section, it bugged out initially so the photo isn’t till the end of the thread.

1C0DFE96-DC0A-4FF5-89A9-A719A9F45A5B.jpeg - 3.2MB
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