--- title: Blog | Brazing & Soldering Manufacturer | Lucas-Milhaupt | Flux description: Flux | Lucas-Milhaupt has offered brazing and soldering excellence for over 65 years. We are a global provider and producer of metal joining products and services for thousands of companies worldwide. Our blog provides you with valuable brazing solutions, tips, and information that can be applied to your own applications and projects. --- [![Lucas_Milhaupt_logo_digital](https://blog.lucasmilhaupt.com/hubfs/Lucas_Milhaupt_logo_digital.jpg)](https://www.lucasmilhaupt.com/) - [Products](https://www.lucasmilhaupt.com/Products) - [Filler Metals](https://www.lucasmilhaupt.com/Products/Filler-Metals) - [Fluxes](https://www.lucasmilhaupt.com/Products/Fluxes) - [Pastes](https://www.lucasmilhaupt.com/Products/Pastes) - [Distribution](https://www.lucasmilhaupt.com/Products/Distribution) - [Industries](https://www.lucasmilhaupt.com/Industries) - [Aerospace](https://www.lucasmilhaupt.com/Industries/Aerospace) - [Automotive](https://www.lucasmilhaupt.com/Industries/Automotive) - [Electrical](https://www.lucasmilhaupt.com/Industries/Electrical) - [HVAC/R](https://www.lucasmilhaupt.com/Industries/HVACR) - [Medical](https://www.lucasmilhaupt.com/Industries/Medical) - [Microelectronics](https://www.lucasmilhaupt.com/Industries/Microelectronics) - [Oil and Gas](https://www.lucasmilhaupt.com/Industries/Oil-and-Gas) - [Services](https://www.lucasmilhaupt.com/Services) - [Capabilities](https://www.lucasmilhaupt.com/Services/Capabilities) - [Consulting Services](https://www.lucasmilhaupt.com/Services/Consulting-Services) - [Brazing Audits](https://www.lucasmilhaupt.com/Services/Brazing-Audit) - [Tech Support Request Form](https://www.lucasmilhaupt.com/Services/Tech-Support-Request-Form) - [Resources](https://www.lucasmilhaupt.com/Resources) - [FAQ](https://www.lucasmilhaupt.com/Resources-Library/FAQ) - [Literature](https://www.lucasmilhaupt.com/Resources-Library/Literature) - [Demo Videos](https://www.lucasmilhaupt.com/Resources-Library/Demo-Videos) - [Technical and Safety Data Sheets](https://www.lucasmilhaupt.com/Resources-Library/Technical-and-Safety-Data-Sheets) - [Brazing Academy](https://www.lucasmilhaupt.com/Brazing-Academy) - [Brazing Fundamentals](https://www.lucasmilhaupt.com/Brazing-Academy/Brazing-Fundamentals) - [Braze School and Training](https://www.lucasmilhaupt.com/Brazing-Academy/Braze-School-and-Training) - [How to Braze Aluminum](https://www.lucasmilhaupt.com/Brazing-Academy/How-to-Braze-Aluminum) - [Principles of Joint Design](https://www.lucasmilhaupt.com/Brazing-Academy/Principles-of-Joint-Design) - [Why Brazing?](https://www.lucasmilhaupt.com/Brazing-Academy/Why-Brazing) - [Metal Joining: Brazing vs. Soldering](https://www.lucasmilhaupt.com/Brazing-Academy/Metal-Joining-Brazing-vs.-Soldering) - [Metal Joining: Brazing vs. Welding](https://www.lucasmilhaupt.com/Brazing-Academy/Metal-Joining-Brazing-vs.-Welding) - [About](https://www.lucasmilhaupt.com/About) - [Center of Excellence](https://www.lucasmilhaupt.com/About/Center-of-Exellence) - [Certification](https://www.lucasmilhaupt.com/About/Certification) - [Find Locations](https://www.lucasmilhaupt.com/About/Find-Locations) - [Find a Distributor](https://www.lucasmilhaupt.com/About/Find-a-Distributor) - [News & Events](https://www.lucasmilhaupt.com/About/NewsEvents) - [History](https://www.lucasmilhaupt.com/About/History) - [SIL-FOS](https://www.lucasmilhaupt.com/About/SIL-FOS) - [Social Responsibility](https://www.lucasmilhaupt.com/About/Social-Responsibility) - [Careers](https://www.lucasmilhaupt.com/About/Careers) - [Culture](https://www.lucasmilhaupt.com/About/Culture) - [Contact](https://www.lucasmilhaupt.com/About/Contact) # Blog ## [How to Clean a Braze Joint in Two Steps](https://blog.lucasmilhaupt.com/en-us/about/blog/cleaning-the-brazed-joint) ***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 ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/cleaning-the-brazed-joint) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux), [Brazing Fundamentals](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/brazing-fundamentals) ## [Stop-Off Helps Restrict Braze Alloy Flow](https://blog.lucasmilhaupt.com/en-us/about/blog/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 ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/restrict-braze-alloy-flow) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux) ## [Flux Removal: Post-Braze Cleaning](https://blog.lucasmilhaupt.com/en-us/about/blog/flux-removal-post-braze) ***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 ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/flux-removal-post-braze) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux), [Brazing Fundamentals](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/brazing-fundamentals) ## [Inspecting Brazed Joints](https://blog.lucasmilhaupt.com/en-us/about/blog/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 ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/inspecting-brazed-joints) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux) ## [Liquid Metal Embrittlement](https://blog.lucasmilhaupt.com/en-us/about/blog/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 ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/liquid-metal-embrittlement) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux), [Copper](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/copper), [Stainless Steel](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/stainless-steel) ## [Warranty Statement](https://blog.lucasmilhaupt.com/en-us/about/blog/lucas-milhaupt-warranty-statements) ***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 ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/lucas-milhaupt-warranty-statements) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux), [Solder](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/solder) ## [White Flux vs. Black Flux Video](https://blog.lucasmilhaupt.com/en-us/about/blog/white-and-black-flux) ***Posted by Lucas-Milhaupt Brazing Experts on Jun 6, 2013*** Flux is a chemical compound applied to joint surfaces before brazing. The addition of metallic boron changes white flux to black. This new video clip will show you the difference between these materials. We will also demonstrate several uses for black flux. For example, in a high-temperature ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/white-and-black-flux) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux), [Oil & Gas](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/oil-gas) ## [Hi-temp Flux Blog](https://blog.lucasmilhaupt.com/en-us/about/blog/high-temperature-flux) ***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, ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/high-temperature-flux) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux), [Oil & Gas](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/oil-gas) ## [Stages of Flux Video](https://blog.lucasmilhaupt.com/en-us/about/blog/four-functions-of-flux) ***Posted by Lucas-Milhaupt Brazing Experts on Apr 12, 2013*** 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, we'll show you how Handy® Flux appears ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/four-functions-of-flux) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux) ## [Stop-Off Blog](https://blog.lucasmilhaupt.com/en-us/about/blog/control-braze-alloy-with-stop-off) ***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 focus on Step 2 - ... [Read More](https://blog.lucasmilhaupt.com/en-us/about/blog/control-braze-alloy-with-stop-off) Topics: [Flux](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux), [Brazing Fundamentals](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/brazing-fundamentals) [All posts](https://blog.lucasmilhaupt.com/en-us/about/blog/all) [Next](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux/page/2) ### Subscribe to Our Blog to Stay Current on All Things Brazing! ### Recent Posts ### Posts by Tag - [Brazing Fundamentals (23)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/brazing-fundamentals) - [HVAC/R (17)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/hvac-r) - [Copper (12)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/copper) - [Flux (12)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/flux) - [Brazing Tips (11)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/brazing-tips) - [Torch (10)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/torch) - [Aluminum (8)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/aluminum) - [Automotive (5)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/automotive) - [Electrical (5)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/electrical) - [Furnace (5)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/furnace) - [High Purity Vacuum Tube Grade (4)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/high-purity-vacuum-tube-grade) - [Oil & Gas (4)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/oil-gas) - [Aerospace (3)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/aerospace) - [Electronics (3)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/electronics) - [Solder (3)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/solder) - [High Silver (2)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/high-silver) - [Low Silver (2)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/low-silver) - [Stainless Steel (2)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/stainless-steel) - [Steel (2)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/steel) - [Carbide (1)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/carbide) - [Medical (1)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/medical) - [Nickel (1)](https://blog.lucasmilhaupt.com/en-us/about/blog/tag/nickel) See all [![Lucas Milhaupt Join with the Best Logo RGB](https://blog.lucasmilhaupt.com/hs-fs/hubfs/Lucas%20Milhaupt%20Join%20with%20the%20Best%20Logo%20RGB.png?width=276&height=93&name=Lucas%20Milhaupt%20Join%20with%20the%20Best%20Logo%20RGB.png)](https://www.lucasmilhaupt.com/) 4850 S. Pennsylvania Ave. Cudahy, WI 53110 (414) 769-6000 - [Contact Us](https://www.lucasmilhaupt.com/About/Contact) - [Privacy](https://www.lucasmilhaupt.com/Privacy) - [Careers](https://www.lucasmilhaupt.com/About/Careers) © Copyright 2025 Lucas Milhaupt LLC | All rights reserved.