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 ...
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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*. Reasons to Remove Flux Let's examine five reasons why post-braze ...
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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? Increase accuracy of estimating the amount of alloy you need-in readily available sizes-for common ...
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Topics: HVAC/R, Copper

What Can Lucas-Milhaupt Technical Services Do for You?

Posted by Lucas-Milhaupt Brazing Experts on Feb 29, 2016
Companies are facing tremendous economic pressure today, which requires renewed focus on core business practices. Your goals may include increasing workforce skills, improving manufacturing processes and building more robust products while reducing costs associated with labor, field failure and ...
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Topics: Brazing Tips

Brazing Components for Refrigeration

Posted by Lucas-Milhaupt Brazing Experts on Sep 24, 2015
Brazing Components for Refrigeration Today, we address correct brazing alloys as well as proper brazing methods for refrigeration components. Our main topics are: Alloy selection Gas and torch selection Brazing method Nitrogen purge System evacuation and charge Remember, brazing in the HVAC/R ...
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Topics: HVAC/R, Copper, Steel, Aluminum, Torch

Brazing for the Refrigeration Cycle

Posted by Kendra Pilon on Aug 3, 2015
Refrigeration is the transfer of heat from a lower temperature region to a higher temperature region. The most common refrigeration cycle-used in home refrigerators-is the vapor-compression refrigeration cycle. This cycle has four components, as seen in Figure 1:  Compressor Condenser Coil ...
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Torch Brazing with Pre-formed Rings vs. Hand-fed Rods

Posted by Lucas-Milhaupt Brazing Experts on Jul 1, 2015
Lucas-Milhaupt performed a study on the performance of braze filler metal rings against the performance of hand-fed filler metal rods. We used three heating, ventilating, air conditioning and refrigeration (HVAC/R) industry-standard tube sizes. Five trained and certified technicians helped ...
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Topics: HVAC/R, Torch

De-alloying or Selective Attack in Brazing

Posted by Lucas-Milhaupt Brazing Experts on Apr 24, 2015
What is dezincification? First, we must understand dealloying-a type of corrosion involving selective leaching or removal of one element or phase with in the material. This selectively removed phase or element from an alloy, leaves behind a porous, spongy mass. Dezincification is a form of ...
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Aluminum Brazing: Corrosive or Non-Corrosive Flux

Posted by Lucas-Milhaupt Brazing Experts on Mar 24, 2015
Aluminum brazing has become prevalent in the automotive and HVAC/R industries. Most manufacturers are using all-aluminum or mostly aluminum components, including evaporator and condenser coils, distributors, liquid and suction lines. When brazing aluminum, two families of fluxes are commercially ...
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Topics: Copper, Nickel, Aluminum, Torch

The Effect of Joint Clearance on Braze Joint Strength

Posted by Mariana Ruiz on Feb 25, 2015
Brazing uses the principle of capillary action to distribute molten filler metal between the surfaces of base metals being joined. Therefore, during the brazing operation, take care to maintain a proper clearance between the base metals to allow capillary action to work effectively. In most cases, ...
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