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Old 06-10-2011, 09:54 AM   #1
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Default Which solder

Hi all. I am just after a few words of wisdom regarding the joining of a cast iron cylinder (1.25" O.D 1" I.D) to a 1/4" piece of steel plate. I was thinking silver solder but which one to use. 45% silver? I shall be using mapp gas for the job.
Thanks in advance


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Old 06-10-2011, 10:48 AM   #2
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Default Re: Which solder

Yes, 45% silver solder and No.2 Silver Solder Flux


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Old 06-10-2011, 10:48 AM   #3
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Default Re: Which solder

Use borax and 50/50 brass brazing rod. Using silver for this joint is overkill and will form no fillet.
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Old 06-10-2011, 11:14 AM   #4
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Default Re: Which solder

50/50 brass brazing rod? Don't think I've ever seen that here - the commonly available brazing rods are either tobin bronze or manganese bronze.
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Old 06-10-2011, 12:26 PM   #5
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Default Re: Which solder

Please forgive my "newbieness" but what is 50/50 brass brazing rod. Could you elaborate for me please
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Old 06-10-2011, 01:22 PM   #6
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Default Re: Which solder

Herbie,

I used what tel said.

Best Regards
Bob
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Old 06-10-2011, 01:55 PM   #7
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Default Re: Which solder

Thanks Tel, BillC and Bob.
Bob, I shall take your method as it seems to work well and is very neat. I too will have to buy a larger burner. One weekend of soldering coming up
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Old 06-10-2011, 01:56 PM   #8
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Default Re: Which solder

Quote:
Originally Posted by Herbiev
Please forgive my "newbieness" but what is 50/50 brass brazing rod. Could you elaborate for me please
I've been trying to get back onto this site - keep getting the message that a connection to the server here could not be established - about 10 - 15 tries. No sure why this is happening but it happens all the time......I don't visit here too much anymore due to this connection problem - sort-of aggravating.

50/50 brass is the lowest and cheapest alloy found in most shops for gas brazing. The alloy is a bit more complex than the 50/50 would indicate but it is basically Copper/Zinc (Cu/Zn). It works well with the basic borax flux and will skin onto cast iron as well as any brazing alloys containing Ag. The ability to work a fillet is very good since it freezes without direct flame contact so it can be manipulated and hot formed quite well.
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Old 06-10-2011, 03:03 PM   #9
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Default Re: Which solder

But I doubt a MAPP gas torch would get it hot enough. So stick with the Silver solder as Tel suggests or if you don't want it containing cadmium then 55% silver will be the nearest.

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Old 06-10-2011, 03:53 PM   #10
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Originally Posted by Jasonb
But I doubt a MAPP gas torch would get it hot enough. So stick with the Silver solder as Tel suggests or if you don't want it containing cadmium then 55% silver will be the nearest.

Jason
Mapp/air will reach 2300 and mapp/O2 will reach 5300 - 50/50 brass is liquid at 1640

Cadmium in sliver solder? Maybe phosphorus (which is not used with ferrous materials - makes the joint brittle).


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