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Code: 29

Publish date: 2018/2/19

De-alloying or Selective Attack in Brazing

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...

Code: 28

Publish date: 2018/1/17

Brazing with Pre-formed Rings vs. Hand-fed Rods

Background Pre-formed rings are designed to provide the correct amount of filler metal to fill a joint completely while avoiding too little-or excess-filler metal. Lucas-Milhaupt's Sil-Fos® rings designed for the HVAC/R industry provide the proper amount of filler metal for each joint. ...

Code: 25

Publish date: 2017/12/18

Brazing & Solder Pastes

Pastes products consist of an atomized filler metal powder, a flux (when necessary) and a binder to hold the components together in suspension. Pastes, like preforms, are advantageous because with the correct dispensing equipment, tight control can be made on material usage. And because paste...

Code: 24

Publish date: 2017/12/12

The Effect of Joint Clearance on Braze Joint Strength

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 ...

Code: 23

Publish date: 2017/9/27

Characteristics of Alloying Elements

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. These are ...

Code: 22

Publish date: 2017/9/10

Brazing Surface Preparation: How to Clean Base Materials

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 Why Clean Base Materials? ...

Code: 20

Publish date: 2017/8/23

How to Repair a Brazed Joint on Aluminum Heat Exchangers

Braze Joint Repair: Aluminum Heat Exchangers Brazing aluminum heat exchangers is a challenging task. Why? Aluminum melts at a low temperature (~1100-1200°F/593-649°C) and does not change color as it heats, so you have almost no notice before the base material melts away. This means the...

Code: 19

Publish date: 2017/3/11

Stay Current on Resistance Brazing

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 ...

Code: 18

Publish date: 2016/12/3

NEW Copper Tubing Braze Alloy Usage Calculator

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 siz...

Code: 17

Publish date: 2016/11/3

Considerations for Carbide Brazing

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. F...

Code: 16

Publish date: 2016/10/16

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 industry is much different from braz...

Code: 15

Publish date: 2016/10/8

Flux Removal: Post-Braze Cleaning

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-bra...

Code: 14

Publish date: 2016/10/8

Vacuum Brazing Success

Part 1: Basics of Vacuum Brazing One of the most common methods of brazing used in commercial applications is open-air torch brazing with a mineral-type flux. The mineral flux prevents, dissolves, and facilitates the removal of oxides from the surface of the base metals to be joined. An advan...

Code: 12

Publish date: 2016/10/8

LOKRING CONNECTIONS (no welding, soldering or screw cutting)

VULKAN Lokring is a company that belongs to the VULKAN Group, which is a medium-sized family-owned enterprise for technical industrial applications with its head office in Germany. As a developer of the LOKRING technology, VULKAN Lokring is a market leader in the field of solder-free and non-detacha...

Code: 11

Publish date: 2016/10/8

Copper-Phosphorous Alloys for Copper Brazing

The alloys copper-phosphorous and silver-copper-phosphorous were patented in the U.S. in 1914 and gained popularity when new refrigerants were developed to replace ammonia. These refrigerants enabled the use of copper to facilitate the increased demand for air-conditioned homes, offices and work are...

Code: 6

Publish date: 2016/10/8

HVAC Joining Aluminum to Copper

Copper-to-Aluminum Joint Integrity HVAC manufacturers evaluating the use of aluminum components need to consider the best method for joining parts-such as evaporator and condenser coils-to secondary copper lines or assemblies. Several joining methods can be used, including: adhesives, mechanical j...

Code: 7

Publish date: 2016/10/8

Protecting Aluminum-Copper HVAC/R Joints

Aluminum-Copper HVAC Protection The HVAC/Refrigeration industry is converting many components from copper to aluminum. The reasons? Aluminum is less expensive by weight, is more corrosion resistant, weighs less, and maintains similar heat-transfer rates to copper. These aluminum parts are joined t...

Code: 001

Publish date: 2016/10/8

The six basic steps in brazing

The importance of correct procedures. We’ve said that a brazed joint “makes itself”—or that capillary action, more than operator skill, insures the distribution of the filler metal into the joint. The real skill lies in the design and engineering of the joint. But even a pr...

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