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INDEX

New variant in Solvay's NOCOLOK® product portfolio
New in the NOCOLOK®-Team: Stephan Gensac
NOCOLOK®-Distributors in TOP 20 in Asia
Upcoming Brazing Events 2015
NOCOLOK® Survey Win an iPad Air
Flux Paints and Pastes - Part 2


New variant in Solvay's NOCOLOK® product portfolio

NOCOLOK Flux Paste product information

Pastes with NOCOLOK® offer a wide variety of options in flux and brazing alloy powders. Many formulations are adapted for specific technical requirements of the brazing processes. Customized products are available with defined composition ratios and viscosity ranges.
Now there are new variants available in Solvay's product portfolio: Pastes containing NOCOLOK® Li Flux - with and without brazing alloy powder.
We have developed these new formulations to improve further flux residue performance. When using Li flux pastes, potential surface interactions of brazed aluminium with water are significantly reduced. One advantage is the lower solubility of post-braze flux residue. This minimizes specific effects that are connected to dissolution.


The new NOCOLOK® Li Flux pastes show the same outstanding properties and brazing performance of standard pastes - with further enhancement of the post braze flux residue characteristics.

For detailed information, please download the PDF.


New in the NOCOLOK®-Team: Stephan Gensac

Stephan Gensac

Stephan Gensac is part of the NOCOLOK® Team since autumn 2014, coming from FLUX Schweiß-und Lötstoffe.  Since 2000, Stephan has been working in the automotive industry, VALEO Group, especially in thermal system branch, in several management positions (engineering, quality and project) with global leadership. He was certified twice as VALEO Group Brazing Expert. Stephan joined FLUX in autumn 2011 as Automotive Division Director with worldwide responsibilities.

In Solvay, Stephan is now Head of Product Development & Technical Service for the Business Unit NOCOLOK®. "Expertise, creativity, motivation for change, and proximity are the strengths of our team," emphasizes Stephan Gensac.


A graduated engineer after studies in France and Sweden, Stephan worked in Sweden, Poland, France and now Germany; he is fond of the multi-cultural environment and diversity. Stephan speaks five languages (French, English, Spanish, Polish, Swedish), now dedicating his free time to learn German and to practice all possible sports with his nine year old son Maxime.


NOCOLOK®-Distributors in TOP 20 in Asia

The NOCOLOK® Team is pleased to congratulate its partners Jebsen & Jessen Group and KPL International for being in the TOP 20 highest turnover Asian chemical distributors. The cooperation over many years between Solvay and its distributors is based on mutual trust und the high levels of professionalism on both sides.
KPL International
Jebsen & Jessen Group


Upcoming Brazing Events 2015

September 29th - October 1st
SAE 2015 Thermal Management Systems Symposium
Troy Marriott - Troy, Michigan, USA
www.sae.org


2015 October 13th – 15th
EABS Technical Training Seminar
NOCOLOK Technical Center, Hanover, Germany
Seminar-Program
annette.daubner@solvay.com


November 25th – 26th
2015 Gränges India Technical Seminar
Chennai, India on two half days of 25th November and 26th November 2015.


2016 April 19th – 21th
9th International Congress Aluminium Brazing and Exhibition
Dusseldorf, Germany www.dvs-ev.de


Win an iPad Air

winipadair

Participate in our Customer Satisfaction Survey 2015 and you will have the good chance to win an Apple iPad Air, 16 GB, Wi-Fi. In early 2016, we will raffle an iPad Air among all participants who have entered their feedback. Please take five minutes of your time and share your appraisal. All participants in the 2014 survey can of course also participate this year. We appreciate your opinion and you can possibly look forward an iPad Air.
Please click here for the survey!


Flux Paints and Pastes - Part 2

Flux and Braze Paste Characteristics

The purpose of flux and/or braze pastes is to provide an initial or supplemental volume of flux and/or filler metal in the form of a viscous liquid at or near the interface of two components:


  • Folded tube seams
  • Tube to header joints
  • Connector tube to manifolds
  • End caps
  • Blocks and fittings
  • Flame braze joints

Viscosity

Flux and braze pastes exhibit pseudoplastic viscosity, meaning to have shear thinning behavior. As the shear stress is increased, the viscosity decreases, but the relationship is not linear. When the shear stress decreases, the viscosity increases, again non-linearly. Other factors affecting viscosity are solids content and temperature. Generally speaking, as the temperature increases, the viscosity decreases. Conversely, as the solids content increases, the viscosity also increases. These dependences illustrate the importance of quoting the parameters under which the viscosity is measured.

The graph below shows the effect of temperature on viscosity:


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Note that at each temperature, a double curve is shown representing two sets of measurements: one curve shows the decrease in viscosity as the shear rate is increased and the other curve shows the increase in viscosity as the shear rate is decreased. This mirrored behavior as the shear rate is increased or decreased perfectly illustrates the pseudoplastic behavior.

The following curves show both: – the effect of temperature, and – solids content on viscosity:


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These properties allow a bead of flux paste to be dispensed on the surface of a folded tube consistently and continuously at line speeds ranging from 30 m/min to 120 m/min.


Braze-paste

Influence of Carrier on Volatilization Behavior

Since the carrier is a main ingredient, the carrier burn off temperature must be considered.


Below are 3 TGA curves showing burn-off temperature of 3 different paste formulations:


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Delivery Systems and Recommendations

When designing a flux delivery system, choosing the right delivery pump is just as important. Below is a list of pros and cons for the associated pumps.


Diaphragm Pump

  • Low cost, low maintenance
  • High flow
  • Generally used for low viscosity fluids
  • Pulsation, viscosity sensitive
  • Poor flow metering

Air Over Liquid (Pressure Vessel)

  • Low cost, low maintenance
  • Temperature sensitive
  • Viscosity sensitive
  • Poor flow metering

Rotary/Gear Pump

  • High viscous liquids
  • Metered dosing
  • Pulsation
  • Does not handle solids

Rotor-Stator Pumps

  • High viscous liquids
  • No pulsation
  • Precision metering
  • Not viscosity sensitive
  • Highest cost

Rotor-stator pumps are the pumps of choice because of their ability to deliver a constant volume of material without pulsation over a range of flow rates. The best example of this is in the localized dispensing of a continuous bead/stripe in folded tube mills where speeds can range from 20 m/min to 120 m/min.


In lower demanding applications where precision dispensing and flow control is not so critical, for example in tube to header fluxing, the lower cost options (air over liquid, diaphragm pumps) are more than adequate.


Everything you are looking for is right here:

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The NOCOLOK® website gives access to all information relating to aluminium brazing, applications, products and technical service:
go to NOCOLOK® Website


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The Aluminium Brazing Blog is the platform for exchanging experiences about aluminium brazing:
go to Aluminium Brazing Blog


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Product information, brochures and videos all about NOCOLOK® are available here for download:
go to Download Section


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All videos about aluminium brazing on YouTube:
go to YouTube


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Tell us your opinion:
go to the NOCOLOK® Survey


NOCOLOK® NEWS
Presents information for NOCOLOK® users.
Publisher:
Solvay Fluor GmbH
Hans-Böckler-Allee 20 • 30173 Hannover, Germany
Place: Hannover
Register: Hannover HRB 58647
Managing Directors: Horst Kröger, Dr. Johannes Eicher
Editorial:
Solvay Fluor GmbH
Department SFLU-RBUSI
E-Mail: hans.swidersky@solvay.com
Production:
Ahlers Heinel Werbeagentur GmbH, Hannover
www.ahlersheinel.de
nocolok@ahlersheinel.de

NOCOLOK® is a registered Trademark of Solvay Fluor GmbH
All statements, information, and data given herein are believed to be accurate and reliable but are presented without guarantee, warranty or responsibility of any kind, express or implied. Statements or suggestions concerning possible use of our products are made without representation or warranty that any such use is free of patent infringement, and are not recommandations to infringe any patent. The user should not assume that all safety measures are indicated, or that other measures may not be required. In any case, the user is not exempt from observing all legal, administrative and regulatory procedures relating to the product, personal hygiene, and protection of human welfare and the environment.

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