Characteristics of Alloying Elements

Posted by Gary DeVries on Jul 18, 2017

Join us as our technical team outlines the main elements used in brazing filler metals, along with the most important features of each element. The more you understand about these elements, the better equipped you are to choose and use the correct products for your brazing operation.

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How to Repair a Brazed Joint on Aluminum Heat Exchangers

Posted by Lucas-Milhaupt Brazing Experts on Jun 15, 2017

Braze Joint Repair: Aluminum Heat Exchangers

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Brazing Surface Preparation: How to Clean Base Materials

Posted by BJ Szyjakowski on Jun 1, 2017

Having clean base materials is one of the Six Fundamentals of Brazing that ensure quality braze joints:
1. Good fit and proper clearance
2. Clean base materials
3. Proper flux/atmosphere
4. Proper fixturing
5. Proper heating
6. Final cleaning

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Your Industry-Specific Brazing Solutions

Posted by Lucas-Milhaupt Brazing Experts on Apr 12, 2017

You want brazing solutions designed for your needs – whether you are manufacturing air conditioning systems for automobiles or highly sensitive jet turbine blades or even components for satellites. Find out which brazing alloys and consumables meet your specific needs.

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Topics: HVAC/R, Aerospace, Automotive, Electrical, Electronics

Stay Current on Resistance Brazing

Posted by BJ Szyjakowski on Jan 19, 2017

The most common brazing processes include torch, induction, furnace and resistance brazing. Of these methods, resistance brazing is the least common heating method. Why? Compared to the others, it is a fast and relatively inexpensive process, but limitations in assembly geometry have restricted its practicality. However, today’s technology has expanded resistance-brazing applications to more complex assembly styles. 

The Process

Resistance brazing is very similar to spot welding. Both processes heat the base materials by sending direct current through the joint interface. While welding melts the base materials together, resistance brazing only melts the brazing filler metal.

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Considerations for Carbide Brazing

Posted by Lucas-Milhaupt Brazing Experts on Oct 19, 2016


Carbide inserts can provide superior wear resistance and prolonged life in cutting and wear processes. These mechanical properties make carbides useful for mining tools, cutting tools, wear parts and other applications. Let's look at the joining process used to attach carbides to their holders. For this discussion, we will focus on tungsten carbides containing a cobalt binder.

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Topics: Carbide, Oil & Gas

Vacuum Brazing Success

Posted by Lucas-Milhaupt Brazing Experts on Jul 28, 2016


The most common brazing processes include torch, induction, resistance and furnace brazing. In furnace brazing, filler metal in the form of pre-forms or paste is placed onto an assembly to be joined. This type of brazing includes either a protective atmosphere or the evacuation of the surrounding atmosphere-called vacuum brazing.

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Topics: High Purity Vacuum Tube Grade, Furnace

Stop-Off Helps Restrict Braze Alloy Flow

Posted by Lucas-Milhaupt Brazing Experts on Jul 5, 2016


Because of tolerances, aesthetics or joint design, you sometimes need the flow of braze alloy to be restricted-to stop its flow or keep it off a surface. Capillary dams are often designed into these parts to limit braze alloy flow. A capillary dam is when the clearance is increased to a point where capillary action no longer exists. Ideal clearances for the best capillary strengths are .000"-.002" in furnace, and .002"-.005" in open air. Anything over .012" is preferred as a capillary dam. When the assembly cannot be designed to naturally prevent braze alloy flow, a brazing aid called Stop-Off can help you prevent or guide the flow of braze allow on your assembly.

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Topics: Flux

Flux Removal: Post-Braze Cleaning

Posted by Lucas-Milhaupt Brazing Experts on May 16, 2016


Depending on your brazing process, you may need to perform post-braze joint cleaning to remove residual flux. This step can be crucial since most fluxes are corrosive. Post-braze cleaning is one of the Six Fundamentals of Brazing*.

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Topics: Flux, Brazing Fundamentals

Copper Tubing Braze Alloy Usage Calculator

Posted by Lucas-Milhaupt Brazing Experts on Apr 6, 2016


The new Lucas-Milhaupt® calculator makes it easy and convenient to estimate the amount of braze alloy or solder alloy required for plumbing or HVACR applications. How can you use this online tool?

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Topics: Copper, HVAC/R