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Home » Authors » Dan Kay

Articles by Dan Kay

Torch Brazing Q&A

Dan-kay-200px
Dan Kay
December 22, 2011
No Comments
Question:We do torch brazing of copper and steel tubing/piping for the HVAC industry, and we try to do a nitrogen purge of the ID of the tubing during our
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Brazing Tough-Pitch Copper in Hydrogen Atmosphere

Dan-kay-200px
Dan Kay
October 6, 2011
One Comment
Question: We silver brazed what we thought was a so-called “oxygen-free” grade of copper (C10200) in our hydrogen brazing furnace at 1500°F (815°C) – using BAg-8 filler metal –
Read More

Brazing Problems Associated with Tack Welds

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Dan Kay
September 9, 2011
No Comments
Question:On some of our parts, prior to induction silver braze, we tack weld the parts to be brazed. The parts are fixtured during the tack weld to hold dimensions
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Using a "Stop-Off" in Brazing (part 2)

Dan-kay-200px
Dan Kay
August 18, 2011
No Comments
In addition to the stop-offs mentioned last time, please note that milk of magnesia, readily and cheaply available from many drug and food stores, is actually a decent stop-off that may prove effective for many general-purpose needs. So, do some experimentation and find out what kind of stop-off works best for you.
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Using a "Stop-Off" in Brazing

Dan-kay-200px
Dan Kay
July 18, 2011
No Comments
As the name of this product type indicates, a brazing "stop-off" is supposed to be something that "stops" molten brazing filler metal (BFM) from flowing into areas where it is not supposed to be, thus keeping it "off" surfaces that are supposed to remain clean and free from the presence of any BFM.
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Mixing Your Own Brazing Paste

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Dan Kay
June 14, 2011
One Comment
Brazing paste is not difficult to make yourself. All you need is some brazing filler-metal powder, a gel binder and a paint shaker.
Read More

Brazing Paste Q&A

Dan-kay-200px
Dan Kay
May 2, 2011
No Comments
Question:We have a question relative to extending the expiration date on braze paste. Do you know of an industry standard that we could reference? Is there a particular rule of
Read More

Brazing Fluxes (part 2)

Dan-kay-200px
Dan Kay
April 4, 2011
One Comment
Cleaning Fluxes After BrazingThe ONLY solvent that should be used for removing flux residues from the surface of the parts being brazed is HOT WATER. The hotter the water, the
Read More

Brazing Fluxes

Dan-kay-200px
Dan Kay
March 21, 2011
One Comment
Brazing fluxes are compounds that are designed to be put onto metal surfaces in order to protect those metal surfaces from oxidation during a brazing process that is being conducted in open air.
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Reducing Metal Oxides in Brazing (part 3)

Dan-kay-200px
Dan Kay
March 4, 2011
No Comments
Let me make two important statements right at the start: 1. Surface-oxidation of metals will prevent effective brazing. 2. Brazing filler metals (BFMs) do not like to bond to (or flow over) oils, dirt, greases or oxides on metal surfaces.
Read More
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