Get rid of the surface carbon by using the oxidizing part of the flame. There should be millions of them in junk yards.
Old cast iron can be brittle and while grinding the backside of the crack a chunk of cast iron.
Silver soldering cast iron. I broke the cast iron part with a rubber mallet by accident. After doing a lot of reading I bought Superior 601 silver brazing paste flux and Harris Safety-Silv 45 45 silver brazing alloy 116 dia. One of the pictures shows the part horizontally and it looks like there is a gap in the joint.
I have had only one try at silver soldering cast iron it was a casting for a tailstock handle that had the ball snapped off the handle by shock. I fluxed it up and aligned the fresh surfaces to. Take a small glass fill if full of marbles and then pour in black pepper till its completely surrounding all the marbles that is what cast iron really is nodules of iron surrounded by free carbonthe pepper and thats why it breaks so easily the nodules are not completely cemented joined to each other when machining or grinding cast iron your hands get black from the free carbon.
How to Silver Solder a Cast Iron Flange to Aluminized Steel Tubing with SSF-6 Silver Solder - YouTube. Write Clearly and Concisely Grammarly. For cast iron repairs I use Harris Welco 17FC with an oxyacetylene torch.
The process is much like silver soldering in that you tin both surfaces. I use a vee prep on the casting and once both surfaces are tinned I jig the parts and fill the vee prep. Unlike the silver solder the 17FC is approximately twice the strength of the cast iron.
Silver soldering of cast iron is sraightforward once the surfaces are clean and free of carbongraphite. Silver solder will not wet onto carbon. The best jigs are carbon.
Get rid of the surface carbon by using the oxidizing part of the flame. Thats the bit outside the blue zone of your flame. Heat to red and hold for a couple om minutes.
Actually you can weld cast iron well if you follow the proper procedures. That said most welding shops prolly wont. First the end of the crack needs to be found.
Wipe the cracked area down with kerosine. Wipe dry and then rub powdered chalt over the crack. This way you can see where the crack actually ends.
Drill a small hole at the end of the crack. Old school soldering iron- the lower wattage models will not work on silver. They just do not produce the heat.
You will need at least a 40-watt iron or a dual wattage model to get the job done. MAPP Irons- these burn MAPP gas and they produce a hotter heat than a butane iron will give you. This option makes soldering silver faster and easier.
Silver Solder can be used to join most common metals including Mild Steel Stainless Steel Copper Brass Cast Iron and Dissimilar Metals. Fluxed or Bare Wire. Silver Solder Braze is usually available in 2 or 3 forms.
Bare Wire Silver Solder Braze. This is my preferred type. With this wire you use a powder flux.
It is cast iron. Which is stronger silver solder or braze. I am leaning towards silver solder but I am not sure.
What do you think. Jul 12 2012 2 Nickel weld would be the strongest followed by brazing. That was a very popular engine.
There should be millions of them in junk yards. That does not mean that silver brazing high-temp silver solder or bronze brazing will not work on cast iron. Both processes can work just fine.
But cast iron is a wildly variable material and cast iron thats been used in a working machine for decades is frequently impregnated with oils grease or other contaminants which can have a huge impact of the success or failure of a brazing repair. Silver soldering cast iron demonstration featuring a custom exhaust system. Watch as Josh Colson from Auburn Muffler and Auto Repair in Auburn Washington uses SSF-6 Silver Solder to braze a cast iron flange to aluminized steel tubing to create better air flow.
The parts featured were removed from a 2000 Mazda RX7 turbo. 18 Dec 10 1740. We are trying to repair rust pits at water jackets on a cast iron block with Solder and so far are unsuccessful.
Weve tried rod silver solder with flux tried arc welding with low melting point nickel rod none of which worked. May 18 2013. I used a silver solder on a little Fairbanks Morse ZD when I first started restoring engines.
I used it for the same reason as Gary it melts at a lower temp. I also read that silver solder can flow better when use on cast iron than regular braising. This is assuming that the cast is completely clean.
Some types of cast iron are more difficult to solder than other. In general one should avoid silver solders containing phosphorus usually the high copper solders. Solders with some zinc and 40-50 silver work the best for me anyway.
And yes oil in the iron can make silver soldering or brazing very difficult even after good burn out. Anyone had success silver soldering cast iron. I have a small iron casting with a broken off ear.
Low stress feature on the part. A clean break looks to be a perfect application for silver solder. Last Subscription Date 03222021 May 15 2020.
Silver solder is not very forgiving on any thing that is not absolute clean pure cast iron is not a clean pure metal any dirt or say graphite in the case of cast iron in my view would be very difficult to silver solder and the results would be very poor with a great deal of porosity I may be wrong I tried to silver solder aluminium bronze once not knowing what the bronze was and the. Silver Soldering Technical advice in the original SifTips style which started in 1932 Sifbronzing is an almost universally recognised way of describing the low temperature bronze welding of sheet steel cast iron and other metals. The reason behind this fact summarises why.
In the meantime the cast iron will form. You will see the carbon is more than 25 to 45 percent by weight and it will be a part of combined carbon type. Usually the white cast iron is hard and stiff with silvery white fracture which is difficult to machine.
I cleaned and prepped the casting cut the threads off at 38 by 2 12 inch hex bolt and then threaded the shank with a 18 NPT die. I coated the threads of the bolt with graphite to keep the silver solder from sticking to it. Then screwed the bolt into what was left of the.
Some cast iron will silver solder easily some can be a nightmare. Brazing with bronze is more certain but needs more heat which in turn increases the risk of. Once the cast iron begins to turn dull red apply the SSF-6 flux and rod to the crack.
Each time you deposit more SSF-6 be sure to flow it flat into the base metal before applying more rod. If you run into an area in which the silver solder is not sticking stop and re-clean the area to ensure no grinder residue is impeding the bond. Old cast iron can be brittle and while grinding the backside of the crack a chunk of cast iron.
As any one tried soldering cast iron and have any hints or tips on how to. 357 forum posts 200 photos. A couple of years ago I needed to silver solder some cast iron cylinders and the timing of the job.
SSF-6 high strength silver solder brazing rod is utilized to repair a cast iron 1963 Cadillac Deville exhaust manifold. This cast iron exhaust manifold orig.