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Active Brazing Alloys (ABA)
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There is a lot of
interest today in joining engineered-ceramic materials (such as alumina) to
themselves or to metals. |
by Dan Kay | January 17, 2012 | Comments (0)
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Torch Brazing Q&A
Brazing Q&A
Brazing Problems Associated with Tack Welds
Using a "Stop-Off" in Brazing (part 2)
| 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. |
by Dan Kay | August 18, 2011 | Comments (0)
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Using a "Stop-Off" in Brazing
| 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. |
by Dan Kay | July 18, 2011 | Comments (0)
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Mixing Your Own Brazing Paste
| Brazing paste is not difficult to make yourself. All you need is some brazing filler-metal powder, a gel binder and a paint shaker.
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by Dan Kay | June 14, 2011 | Comments (0)
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Brazing Paste Q&A
Brazing Fluxes (part 2)
Brazing Fluxes
| 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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by Dan Kay | March 21, 2011 | Comments (0)
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Reducing Metal Oxides in Brazing (part 3)
| 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.
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by Dan Kay | March 4, 2011 | Comments (0)
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Reducing Metal Oxides in Brazing (part 2)
| 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.
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by Dan Kay | February 11, 2011 | Comments (0)
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Reducing Metal Oxides in Brazing (part 1)
| 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.
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by Dan Kay | January 24, 2011 | Comments (0)
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Furnace Brazing of 304 vs. 304L
| Questions still arise about the difference between certain grades of stainless steel, such as 304 versus 304L, when it comes to brazing. So, let's take a brief look at this subject once again.
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by Dan Kay | January 10, 2011 | Comments (0)
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Brazing 316 Stainless to ASTM A516 Grade 70
Brazing 321 Stainless is Not Easy
| Over the years, I've encountered a number of situations where brazing shops have had difficulty brazing 321 stainless, even though they have no difficulties brazing 304L items.
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by Dan Kay | November 4, 2010 | Comments (4)
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Voids in Brazed Joints (Part 5)
Torch Settings: Neutral or Reducing?
The Famous Joint Strength vs. Joint Clearance Chart
| One of the most famous charts ever used in brazing is the famous (infamous?) strength vs. clearance chart created from work done in the Handy & Harman laboratories in Fairfield, Conn., back in the 1930s.
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by Dan Kay | July 8, 2010 | Comments (0)
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Dimensioning Braze-Fillets on Drawings
| The first, and obvious, point to make about dimensioning braze fillets on drawings is that once a braze-fillet size is specified on a drawing, it must be inspected and measured to verify compliance.
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by Dan Kay | June 10, 2010 | Comments (0)
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Stainless Steel Brazing on Graphite Fixtures?
| Many brazing shops use graphite fixtures on which they set parts that are being brazed.
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by Dan Kay | May 13, 2010 | Comments (0)
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Dye- and Fluorescent-Penetrant Inspection in Brazing?
| It is NOT recommended that either dye-penetrant inspection (DPI) or fluorescent-penetrant inspection (FPI) be used for inspecting brazed joints, particularly on any parts for which subsequent braze repair may be required!
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by Dan Kay | April 22, 2010 | Comments (0)
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Proper Use of Radiographic Inspection in Brazing
| A number of corporations use radiography as an important part of their accept/reject criteria for in-house brazing operations, believing that X-ray films can always show any imperfections, voids, etc. in any of the components they braze.
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by Dan Kay | April 8, 2010 | Comments (0)
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Carbon Residues on Brazed Joints
Effect of Surface Roughness of Parts to be Brazed
| Extensive testing over the years in many places has shown that the best surface (generally speaking) for brazing is the "as-received" surface roughness of the material coming into the shop.
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by Dan Kay | February 11, 2010 | Comments (0)
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Diffusion Bonding/Brazing
Braze Erosion
Quenching From Above the Solidus Temperature of a BFM
Lightweight Materials for High-Temperature Furnace-Brazing Fixtures
| In today's tough economy, brazing shops need to take a closer look at ways to lower their brazing costs.
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by Dan Kay | October 15, 2009 | Comments (0)
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Effect of Heating Rates on Distortion/Fracture of Assemblies Being Brazed (Part 2)
Effect of Heating Rates on Distortion/Fracture of Assemblies Being Brazed
Can I Braze Metals to Ceramic?
| Brazing is a highly versatile joining technique that can even allow metals to be permanently bonded to certain structural ceramic materials.
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by Dan Kay | September 3, 2009 | Comments (3)
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Fluxes For Use When Vacuum Brazing
Brazing Copper to Stainless Steel in Vacuum
Concerns with Brazing 409 Stainless
Vertical Test Specimen for Furnace Brazing (Part 2)
| The VTS provides a unique way to determine exactly what kind of braze clearances can be tolerated in your particular furnace with your particular base metals and BFMs.
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by Dan Kay | May 14, 2009 | Comments (0)
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Vertical Test Specimen for Furnace Brazing
| Furnace brazing is a common brazing process around the world, and I have witnessed many brazing furnaces in action in many countries – from here to mainland China.
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by Dan Kay | May 7, 2009 | Comments (0)
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Fillets in Brazing (Part 3)
| Today’s blog concludes our discussion on fillets in brazing.
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by Dan Kay | April 30, 2009 | Comments (0)
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Fillets in Brazing (Part 2)
| It was shown in last week's blog that brazing fillets can be a greatly misunderstood phenomenon.
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by Dan Kay | April 23, 2009 | Comments (0)
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Fillets in Brazing (Part 1)
| Brazing fillets can be a greatly misunderstood phenomenon in brazing.
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by Dan Kay | April 16, 2009 | Comments (0)
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Brazing Base Metals Containing Small Amounts of Titanium/Aluminum (Part 2)
| We are nickel-brazing Inconel 718 base metals in a vacuum furnace and are having difficulties with the brazing.
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by Dan Kay | April 9, 2009 | Comments (0)
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Brazing Base Metals Containing Small Amounts of Titanium/Aluminum
Some Essentials for Repair Brazing: Part 4
Some Essentials for Repair Brazing: Part 3
Some Essentials for Repair Brazing: Part 2
Some Essentials for Repair Brazing: Part 1
| Brazing is a versatile process used in many industries around the world to permanently join materials together at elevated temperatures (usually between 1100˚F and 2300˚F) using a brazing filler metal (BFM) with a melting point that is above 840˚F (450˚C) but always below the melting point of the materials being joined.
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by Dan Kay | February 26, 2009 | Comments (0)
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Which Base Metal Should I Use For Braze Fixturing (part 2)?
| There are five typical reasons as to why it's hard to put an "expected life" on a brazing fixture.
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by Dan Kay | February 19, 2009 | Comments (0)
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Which Base Metal Should I Use For Braze Fixturing?
| This question is not an uncommon one. Although I have never personally seen any kind of chart give me an "expected life" for fixture materials, it is important that people understand that there are a number of factors that will control the "life expectancy" of fixturing materials used in brazing, and all of them relate to the service conditions that the fixtures will encounter during the brazing process.
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by Dan Kay | February 12, 2009 | Comments (0)
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Voids in Brazed Joints - Part 4
| As mentioned in the previous blog entries, brazers commonly encounter voids in brazed joints and often wonder where they come from and how to avoid them in future brazements.
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by Dan Kay | February 5, 2009 | Comments (2)
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Voids in Brazed Joints – Part 3
| As mentioned in the previous blog entry, brazers commonly encounter voids in brazed joints and often wonder where they come from and how to avoid them in future brazements.
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by Dan Kay | January 29, 2009 | Comments (0)
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Voids in Brazed Joints – Part 2
| As mentioned in the previous blog entry, brazers commonly encounter voids in brazed joints and often wonder where they come from and how to avoid them in future brazements.
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by Dan Kay | January 22, 2009 | Comments (0)
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Voids in Brazed Joints – Part 1
| Brazers commonly encounter voids in brazed joints and often wonder where they come from and how to avoid them in future brazements.
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by Dan Kay | January 15, 2009 | Comments (0)
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Wide-Gap Brazing
| A common occurrence (unfortunately) in the brazing world is the need to join two parts together by brazing in which the brazing gap is too large – i.e., in the range of 0.010 inches (0.25 mm) or larger. Ideal brazing clearances should be a maximum of 0.000-0.005 inches (0.00-0.125mm) for most brazing filler metals (BFMs).
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by Dan Kay | January 5, 2009 | Comments (0)
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Brazing Flux Can Tell You if Surfaces are Clean
| Many people use silver-based brazing filler metal (BFM) when torch-brazing (i.e., flame-brazing) a variety of base metals such as copper, copper alloys and many types of steel (including stainless steels).
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by Dan Kay | November 6, 2008 | Comments (0)
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How Much Overlap Should I Use for a Lap Joint in Brazing?
Differential Metal Expansion in Brazing
Can Your Suppliers Hurt Your In-house Brazing?
| Over the years I’ve helped many brazing shops resolve common brazing problems (such as leakers, non-wetting surfaces, etc.). In evaluating these situations, it is not uncommon to discover that sub-components (such as brackets or fittings, etc.) from outside suppliers can actually be the troublemakers!
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by Dan Kay | July 24, 2008 | Comments (0)
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Why Does Brazing Require Temperatures Above 450°C (840°F)?
| Brazing, when performed correctly, is a joining process that produces a permanent bond between two or more materials by heating them to a temperature above 450°C (840°F), but lower than the melting-temperature of any of the materials being joined.
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by Dan Kay | July 1, 2008 | Comments (2)
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