How to Clean a Braze Joint in Two Steps

Posted by Lucas-Milhaupt Brazing Experts on Jun 14, 2018
Once you have properly brazed the assembly, you will need to clean the brazed joint. Cleaning a braze joint is a two step process. The first step is to remove all flux residues. Second, pickle the joint to remove any oxide scale formed during the brazing process. Step 1: Flux Removal Flux removal ...
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Topics: Flux, Brazing Fundamentals

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

Inspecting Brazed Joints

Posted by Lucas-Milhaupt Brazing Experts on Jul 11, 2014
Radiographic Examination - Discontinuity Images on Film Examining finished joints may be the final step in the brazing process, but inspection procedures should be incorporated into the design stage. Your methodology will depend on the application, service and end-user requirements plus regulatory ...
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Topics: Flux

Liquid Metal Embrittlement

Posted by Lucas-Milhaupt Brazing Experts on Mar 6, 2014
Liquid Metal Embrittlement Liquid Metal Embrittlement (LME) may occur in a brazing operation involving high-strength materials such as stainless steels, nickel alloys or age-hardened alloys, when the materials are stressed and come into contact with molten brazing filler metal. Many cases have been ...
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Topics: Flux, Copper, Stainless Steel

Warranty Statement

Posted by Lucas-Milhaupt Brazing Experts on Feb 3, 2014
Lucas-Milhaupt Warranty vs. Shelf Life Many times each year, customers ask our Technical Services Group, "What is the shelf life of your formulated products?" In most cases, Lucas-Milhaupt does not provide a shelf life, but rather a warranty. Please note that warranties do not mean that the product ...
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Topics: Flux, Solder

Hi-temp Flux Blog

Posted by Lucas-Milhaupt Brazing Experts on May 7, 2013
The Right Flux for the Job High-temperature fluxes are used with brazing filler materials having melting temperatures of 1600°F (870°C) - 2000°F (1100°C), or 2200°F (1205°C) for boron-modified filler. These fluxes are useful for applications where higher-temperature alloys are needed for strength, ...
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Topics: Flux, Oil & Gas

Stages of Flux Video

Posted by Lucas-Milhaupt Brazing Experts on Apr 12, 2013
Functions & Stages of Flux Flux is a chemical compound applied to the joint surfaces before brazing.  Watch our new technical video for an in-depth look at the four functions of flux: 1.    Protect from oxygen 2.    Dissolve & absorb oxides 3.    Help filler flow 4.    Indicate temperature Then, ...
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Topics: Flux

Stop-Off Blog

Posted by Lucas-Milhaupt Brazing Experts on Mar 19, 2013
How Stop-Off Works To understanding how Stop-Off works, let's review the brazing process.  At Lucas Milhaupt, we preach six fundamentals of brazing: 1.    Good fit & clearance 2.    Clean metals 3.    Uniform fluxing 4.    Proper assembly 5.    Brazing technique 6.    Post-braze cleaning Let's ...
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Topics: Flux, Brazing Fundamentals

Handy One® Improves Joint Quality and Reduces Flux Usage

Posted by Lucas-Milhaupt Brazing Experts on Sep 19, 2012
Brazing Methods Brazing methods range from torch brazing in open air to vacuum furnace brazing.  Torch and induction brazing are the most common, using an Ag-Cu-Zn alloy to form joints. Oxides form on surfaces of base metals in open air, prohibiting the filler metal from wetting the assembly ...
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Topics: Flux