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How do you un-braze

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DaveInMI

08-16-2001 03:42:53

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The stub axle in my OC3 crawler has been brazed in so that the sprocket is about 7 degrees off verticle. I want to weld or braze it so the track is flat on the ground. I'm worried about cracking the casting. I have an AC and gas welders but don't think I can pre-heat the casting because of its size. How do I get rid of the brazing that is there. There is a thick build-up. Thanks in advance for your suggestions.

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John Ne.

08-16-2001 21:09:59

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Re: How do you un-braze in reply to DaveInMI, 08-16-2001 03:42:53

Dave, We always want to make things right, when possible. But ask yourself, how long ago was this repair done? Has it caused any abnormal wear? That you just can't live with? Does it cause some other part to not fit in right? The older machinery kept running for years with some mighty poor and incorrect repairs. Not trying to talk you out of the repair, just asking if its really necessary. John in Nebraska.

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Steve U.S. Alloys

08-16-2001 05:59:08

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Re: How do you un-braze in reply to DaveInMI, 08-16-2001 03:42:53

You can blow the deposit off with an airless gouging electrode w/o much trouble. I have even blown arc welded deposits away like that without really leaving so much as a scratch on the base metal.

If you intend to reposition the part and weld it right back on at a different angle, the gouging rod can be used to vee out the weld area and will also establish a sufficient preheat. Just wire brush before welding.

There will be very little carbon added to the base metal as compared to an air arc electrode. The arc force of the gouging rod is softer also, making it easier to steer and easier to control the depth of the groove. It won't side arc either. Works best on AC at 150 amps in 1/8" diameter.

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Mark Kw

08-16-2001 05:06:41

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Re: How do you un-braze in reply to DaveInMI, 08-16-2001 03:42:53

It's not easy in some cases and does not take much in others. If you heat the braze with the torch until it melts, most times you use a wire brush to clean the melted braze off. Some are more difficult and you may have to use a wick to pull it away. To do this, I use a piece of copper welding cable (fine strand wire). Remove about 4" of the insulation to epose the copper and then warm it up with the torch and prep with a small amount of anti-borax brazing flux. Once the braze is in a molten state it will readily pull into hot strands of copper as they are heated (same proceedure as desoldering electrical components).

You will most likely not get all of it off like this and some grinding may be required to remove the rest.

Depending on the shape of the casting, I have had sleeves machined to fit over them so you lap the entire joint with steel and weld both ends of the sleeve to the casting. This gives you more to work with and distributes the stresses over a larger area.

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