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Home » Blogs » Industrial Heating Experts Speak Blog » Dan Kay - Brazing

Industrial Heating Experts Speak Blog
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Industrial Heating Blog
Learn from leading experts in the thermal processing industry. Read Industrial Heating’s Expert Speak blogs. Helpful and timely technical information from those who know.

Blog Topics

Dan Herring - Heat Treatment

David Pye - Metallurgy

Dan Kay - Brazing

Debbie Aliya - Failure Analysis

George Vander Voort - Metallography

Thomas Joseph - Intellectual Property

Omar Nashashibi – Government

Reed Miller – Thermal Processing

Recent Comments

Man Care

Brazing of 2205 Duplex Stainless Steel to 7020 & 5083 Aluminum alloy

grain boundary oxidization

Thanks to the Mike or Mikes!

Indeed, warned means armed. Although it is never...

Dan Herring

Don't Throw Away Your Diffusion-Pump Oil (Fluid)!

Dan Kay
Dan Kay
May 9, 2023
No Comments

Brazing-shop personnel sometimes make a big mistake by discarding the diffusion-pump “oil” from their vacuum furnaces right along with all the other containers of used oil from their shop operations, including all the oils from mechanical pumps or lubricants from forming/machining operations. This is a BIG mistake!


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Dan Herring

Correctly Applying Brazing Filler Metal (part 3)

Dan Kay
Dan Kay
April 6, 2023
No Comments

Learn how to correctly apply brazing filler metal in part 3 of Dan Kay's latest blog series.


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Dan Herring

Correctly Applying Brazing Filler Metal (part 2)

Dan Kay
Dan Kay
March 21, 2023
No Comments

Figure 3 shows a cross-section photo of a round electrical contact that was brazed onto a flat surface, where the applied BFM completely surrounded the disc-shaped part that was to be brazed to the substrate below it. When the BFM melted and tried to flow into the joint, it could not do so since the air and other contaminants inside the joint could not escape to the outside because the “wall of liquid BFM” around the outside of the joint was blocking it. Thus, a braze fillet was formed around the outside of the joint, but the BFM could not flow into the joint.


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Dan Herring

Correctly Applying Brazing Filler Metal (part 1)

Dan Kay
Dan Kay
March 2, 2023
No Comments

Brazing filler metal (BFM) is available in a variety of different forms, shapes and sizes, such as wire, rod, paste, sheet, foil, preforms and cladding. BFMs are often applied externally, but some of these BFM forms can be applied internally (i.e., inside the component assembly to be brazed like when foil, cladding and solid preform rings are used).


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Dan Herring

Heat-Treating-of-Fixtures Business

Dan Kay
Dan Kay
February 9, 2023
No Comments

Are you in the brazing business or in the heat-treating-of-fixtures business? Many brazing companies claim they are a brazing job shop doing lots of brazing for their clients, when in actuality they are only doing the brazing work for their clients in order to generate some income to pay for their real business (i.e., heat treating of furnace fixtures). Does that seem strange? Let’s take a deeper look at this.


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Dan Herring

Filler Metal Makes Braze Paste (part 4)

Dan Kay
Dan Kay
January 17, 2023
No Comments

Here is the conclusion of Dan Kay's blog series "Filler Metal Makes Braze Paste."


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Dan Herring

Filler Metal Makes Braze Paste (part 3)

Dan Kay
Dan Kay
December 20, 2022
No Comments

Notice in Table 2 that there are strict requirements for the amount of oversized and undersized powder particles in each mesh size group. For example, to be classified as a -140C powder (“C” stands for “course”), the screened powder can only have a maximum of 20% -325 mesh powder. Thus, 80% of powder classified as -140C-mesh must be -140 mesh/+325 mesh, meaning it should all go through the 140-mesh screen, but 80% or more must sit on top of, and not go through, a 325-mesh screen. 


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Dan Herring

Filler Metal Makes Braze Paste (part 2)

Dan Kay
Dan Kay
December 6, 2022
No Comments

Figure 3 shows a laboratory wire-mesh sieve screen used for 140-mesh powder. If atomized powder is not able to go through this screen because the openings in the screen are smaller than the size of those powder particles, then those large particles will remain on top of the 140-mesh screen and would be called “plus (+)” sized powders because they sit on top of the screen and cannot go through. Powder particles that can go through the screen are given a “minus (-)” particle-size designation, indicating that they can go through that screen.


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Dan Herring

Filler Metal Makes Braze Paste (part 1)

Dan Kay
Dan Kay
November 15, 2022
No Comments

A common way to create brazing filler metal (BFM) powder is by melting the raw metallic ingredients for the BFM in a large melting pot using induction heating and then pouring that alloyed liquid metal through a specialized atomization nozzle.


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Dan Herring

Tight Joint Clearances for Nickel Brazing (part 3)

Dan Kay
Dan Kay
September 27, 2022
No Comments

Dan Kay's blog series about tight joint clearances for nickel brazing continues with part 3.


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