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Reflow Profiling: Time Above Liquidus

Featured Article

Reflow Profiling: Time Above Liquidus

Despite much research and discussion on the subject of reflow profiling, many questions and a good deal of confusion still exist. What is clear is that the pains often associated with profiling can be reduced if there is a strong understanding of the variables that can be encountered during the reflow process, as well as the metallurgical dynamics of the soldering process.

This paper shall provide a brief outline of the reflow profile in general, with specific emphasis placed upon the suggested time spent above the melting temperature of the solder. The guidelines for soldering to various surfaces and with alternative solder alloys also are discussed.

Credit/Source: AIM, David Suraski


Featured Auction
MV-2HT Series

Desktop AOI Machine

Designed to automati-
cally inspect component placement and solder bridge after reflow in SMT line... »»

Manufacturer: Mirtec


SMT, Thru-hole Programming

Programs most popu-
lar AOI Equipment. ny CAD/CAE to any SMT & THT Machine »»

Manufacturer: Unisoft

Featured Auction

Electronic Manufacturing Exchange #71


Sale Type: Online Auction

Sale Open: Wed, Jan. 9, 4:00 AM EST

Sale Ends: Thu, Jan. 10, 9:00 PM EST

Location of Assets: Worldwide

Digital oscilloscopes, spectrum, logic and network analyzers, generators, meters, counters, plug-ins, test sets, cards and much more.


Featured Video Best Inc

TSOP32 Installation Drag Method
(2 min. 56 sec.)


BEST Instructors have put to video demonstrations of common hand soldering skills. These are not designed to be in place of live one on one training where repetitive skills and subsequent one on one feedback is given. Rather they are quick refreshers designed to be viewed if a specific skill has not been practiced in a while.

Watch Video...


Baking components at 70 degree

Posted by Slavik

We decided to bake components in tray package at 70 Degree prior soldering. I am looking for suggestion regarding baking time for MSL3 components...»»

ap25 hi E solvent menu setting

Posted by David Linhoff

I have an AP25 HiE which I am going to use solvent on a perticular job. What are the best settings for the solvent menu?... »»

Germanium doping of SN100...

Posted by James

Has anyone heard of this? I was told that this would help SN100 in the wave solder by making it flow better at a lower temperature?... »»

Visit the Forum...


PCB Repair & Rework

Seminar/Course | Precision PCB Services, Inc

Mon, January 07, 2008 | Oroville, CA, USA

In this two day course students will learn how to repair surface mount pads, BGA pads, finger contacts, traces, laminate... »»

Free Reflow Profiling Webinar

Conference | Heller Industries Inc.

Thu, January 17, 2008 | Online

Success Starts with the Right Profile. Join the leader in oven technology for the latest in thermal profiling information... »»


Trade Show/Exhibition | Reed Exhibitions Japan Ltd.

Wed, January 16, 2008 | Tokyo Big Sight, Tokyo, Japan

Exhibition Featuring all Lines of Test, Inspection and Measurement Systems for SMT, IC Packaging and Board Manufacturing... »»

Visit the Event Calendar...

Career Center

Lead Supplier Quality Engineer- Fluid Systems

General Electric

Schenectady, NY, USA

Responsible for supplier quality for assigned Fluid Systems. Complete Supplier qualifications as required assuring that assigned suppliers have capability... »»

Engineering Technician


Sugarland, TX, USA

Creates programs using CircuitCAM, or manually, for Automated Placement, Inspection, and Test machines used in the manufacturing of printed circuit boards... »»

Process Engineer

Schweitzer Engineering Laboratories

Pullman, WA, USA

The ideal candidate will be able to assist management to specify, evaluate, recommend and conduct acceptance tests on electronic assembly process equipment...»»

Visit Career Center...

Industry Associations


SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies. Membership Info

SMTA Certification for SMT Processes and Six Sigma Green Belt


Next Event: Medical Electronics Symposium


IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly. Membership Info

Standards & Publications

Online Store

Next Event: IPC Test and Inspection Conference: The Changing World of Test Protocols - Reducing Time to Market

SMTnet Express
December 20, 2007

Subscribers: 29967

SMTnet Members:

Companies: 7044

Users: 22874

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Join the companies below who get their products & services found in front of over 1,000,000 users a year at SMTnet

Best Inc


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CE Exchange



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Heller Industries

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Precision Placement Machines


ROC Exhibitions

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