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SMTnet Express, April 14, 2022, Subscribers: 25,694, Companies: 11,564, Users: 27,181

Technical Library

iNEMI Webinar 07.07.2021 - PCB Cleaning

Agenda: Why Cleaning of electronic assemblies?, Cleaning processes, Cleaning process monitoring, Process cost

Credits: ZESTRON

How Clean Is Clean?

Over the past several years, post-reflow defluxing of circuit assemblies has gained in popularity. Microminiaturization of components and boards, combined with higher expected reliability and increased product liability, have contributed to the prominence of defluxing. Lead-free solder paste - with its higher reflow temperatures and negative effects on flux - increase ...

Credits: Aqueous Technologies Corporation

Identifying Flux Residues

Why identify flux residues? The primary purpose of flux is to reduce species of metal oxides from solderable surfaces, and to act as a mechanism for lifting and removing debris. If the assembly is not properly cleaned after manufacturing, flux may continue to reduce metals and may eventually corrode the assembly. When the assembly is powered, the metal ions may...

Credits: ACI Technologies, Inc.

Non-Destructive Test Methods

Failure analysis (FA), by its very nature, is needed only when things goawry. Before any testing is performed on the sample, a decision mustbe made as to whether or not the sample is allowed to be destroyedin the process of testing. Non-destructive testing can allow for re-use of the assembly since the functionality is not altered, but there still remains the possibility ...

Credits: ACI Technologies, Inc.

A Review of Test Methods and Classifications for Halogen-Free Soldering Materials

Over the last few years, there has been an increase in the evaluation and use of halogen-free soldering materials. In addition, there has been increased scrutiny into the level of halogens and refinement of the definition and testing of halogen-free solde

Credits: Indium Corporation

Process Control of Ionic Contamination Achieving 6-Sigma Criteria in The Assembly of Electronic Circuits

Ionic contamination testing as a process control tool a newly developed testing protocol based on IPC-TM 650 2.3.25, was established to enable monitoring of ionic contamination within series production. The testing procedure was successfully implemented within the production of high reliability, safety critical electronic circuits, involving multiple ...

Credits: Robert Bosch LLC Automotive Electronics Division

Electrochemical Methods to Measure the Corrosion Potential of Flux Residues

Reliability Expectations of Highly Dense Electronic Assemblies is commonly validated using Ion Chromatography and Surface Insulation Resistance. Surface Insulation Resistance tests resistance drops on both cleaned and non-cleaned circuit assemblies. It is well documented in the literature that SIR detects ionic residue and the potential of this residue to cause ...

Credits: KYZEN Corporation

See Forum results for related keywords - chromatography : 78

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Electronics Forum

High Mass Board Reflow Oven Recommendation -- We produce some heavy copper multi-layer boards. 4-6 layer typ with 3oz throughout. WE currently are using a Heller 1912EXL with belt speed around 32-36 in/min. I am looking to replace this oven with a more efficient unit. To the best of my knowledge only BTU and Vitronic will fit the bill. What would you all recommend?

Views: 431

Throiugh Hole pad missing after selective soldering -- Hello! We have a strange effect. Some pads of big trough-hole DDR slot just dessapear. Initialy it was soldered with selective soldering process (leaded, 290 degrees, ImSn finish, very short storage). Then some connectors with poor barrel fill we have try to rework with the same selective solderig with addional flux and a bit higher temperature. Afte that at looks like pads was washed away complitly, or dramaticaly decreas in size down to size of through hole. Is it possible that due to overheat, poor pcb quality or by some other reason soldering pad was complitely detached from throuh hole and blow away with a solder? This is quite big multilayer motherboard, that's why we try to make a rework with selective soldering machine, not with soldering station. Boards was prechecked, no issues with lifted lends etc...

Views: 35

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SMT, PCB Electronics Assembly Manufacturing News

SMTA Capital Chapter's Expo and Tech Forum to be Held on May 24th

The SMTA Capital Chapter is pleased to invite you to its upcoming Capital Expo and Tech Forum at Johns Hopkins University / Applied Physics Lab, Kossiakoff Center, 11100 Johns Hopkins Road, Laurel, MD 20723, on Tuesday, May 24th.... | SMTA

MIRTEC to Offer Live Remote Demo of the GENESYS-PIN 3D Pin Inspection System at SMTconnect

MIRTEC will premier its line of 3D AOI and SPI Inspection Systems Hall 4A, Stand 128 at SMTconnect, scheduled to take place May 10-12, 2022 in Nuremberg.... | MIRTEC Corporation

ZESTRON Academy to Host FREE "Defluxing of Copper Pillar Bumped Flip-Chips" Webinar -- ZESTRON is pleased to announce that it will host "Defluxing of Copper Pillar Bumped Flip-Chips" on Tuesday, April 26th, from 11:00 AM to 12:00 PM EST.... | ZESTRON

Read all the NEWS...

SMT / PCB Products






Cleaning Equipment

Purbest Tech


GPD Global

PCBA Cleaning Machine ICT-5600

PCB Cleaning


SIR Testing for Process Qualification and Verification

Test Services








Unisoft ProntoPLACE SMT & Thru-hole Software

Voidless / Vacuum Reflow Soldering Oven



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 I.C.T. Intercontinental ��� Supplier SMT manufacturing Machines

SMT / PCB Equipment Auctions

FEATURED AUCTIONS - Equipment For Sale

AUCTION | Bay Area EMS Prototype Facility

AUCTIONEER | The Branford Group

TYPE | On-Line Auction

FEATURING | Complete Juki Line ��� Very Low Hours & Usage! (100+) Juki Feeders (8mm to 54mm) X-Ray, Microscopes, ESD Work Benches & Soldering

SCHEDULE | April 19-28, 2022

AUCTION | SMT & SUPPORT EQUIPMENT - World Equipment Source / R1 Source, Inc.

AUCTIONEER | XTECH Auctions - Where Technology Sells

TYPE | On-Line Auction

FEATURING | A leading Electronics Manufacturing company, World Equipment Source. Explore over 60 lots all running and maintained by our in-house staff of engineers and technicians.

SCHEDULE | April 26-28, 2022

AUCTION | Surplus to the Ongoing Operation of Global EMS Provider (Intervala)

AUCTIONEER | The Branford Group

TYPE | On-Line Auction

FEATURING | (2) Lines: Siemens & Assembleon Placement Machines Including (500+) Feeders and Accessories! SMT Support and Complete Thru-Hole Department

SCHEDULE | Apr 28 to May 4, 2022

Visit the Equipment Auctions Calendar...

Electronic Equipment Mart

MART - Used Equipment For Sale

 Lewis & Clark Viscom S3088  AOI

AOI / Automated Optical Inspection

Lewis & Clark

World Equipment Source - Assembleon /Yamaha MG1Rl  P&P

Pick and Place Equipment/Feeders

World Equipment Source, LLC

AllSurplus Panasonic NPM-W P&P

Pick and Place/Feeders


KD Electronics - ASM Siemens Parts

Pick and Place/Feeders

KD Electronics

Qinyi Electronics - Panasonic DT401=M


Qinyi Electronics

 Baja Bid - Vitronics Delta 5

Wave Solder Equipment

Baja Bid

View More Used Equipment For Sale... Send a RFQ to Equipment Suppliers ....

MART - Used Equipment Wanted

KD Electronics Agilent 3070

In-Circuit Testers

KD Electronics

 Baja Bid - Autosplice SAS/2

Wire Stripping Machines

Baja Bid

World Equipment Source Assembleon MG-1R

Pick & Place/Feeders

World Equipment Source, LLC

Lewis & Clark Agilent 3070

In-Circuit Testers

Lewis & Clark

See Buyers' Used Equipment Wants

Events Calendar


Atlanta Expo & Tech Forum | April 20 | SMTA

Oregon Expo & Tech Forum | May 3 | SMTA

Virtual Course: Selection Criteria of Surface Finish for Next Generation PCB Technologies | April 20 | SMTA

Defluxing of Copper Pillar Bumped Flip-Chips | April 26 | ZESTRON


ZESTRON Analytical & Support Services

Visit the Events Calendar...

Training Courses



IPC Certification

Soldering & Rework

PCB Design

Electronics Assembly

Electronics Inspection

Online Training

 EPTAC - Your 2021 IPC Training Schedule

Online IPC Training & Certification - Now open for limited in-person training

Electronics Manufacturing and PCB Assembly Training Courses

Counterfeit Components Workshop Online Live Training

Apr 15, 2022 | New Hampshire, Manchester | EPTAC Corporation

SMT Processes Certification Course

Apr 19, 2022 | Wisconsin, Germantown | Surface Mount Technology Association (SMTA)

Component Identification Online Live Certification

Jun 17, 2022 | New Hampshire, Manchester | EPTAC Corporation

Visit All Training Courses...

Career Center

JOBS - Post your job openings now

RESUMES - Post your resume now

Lead Application Laboratory Technician

Manassas, VA | ZESTRON

Field Service Engineer
Florham Park, NJ | Heller Industries Inc.

SMT Process Engineer
Milwaukee, WI | Cree Lighting

Soldering Technician, Touch-up for PCBAs
Santa Cruz, CA | Dynamic Engineering

Business Development Sales Manager, Microelectronics
Suwanee, GA | MacDermid Alpha Electronics Solutions

Nashville, NC | ACDi

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Industry Associations Events


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 | Bookstore | Upcoming Events


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 | Training & Certification | Online Store | Upcoming Events

Editor - Dave "davef" Fish (submit your technical articles), 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

Purbest ��� About Us

Nordson Electronics Solutions ��� Asymtek, March, Select

Selective Conformal Coating System - GPD impleCoat

HELLER - Choose an Oven for Your Reflow Needs

 ZESTRON ��� SIR Test Services

Unused Equipment? - let BajaBid turn your EXCESS ASSETS into cash!

X-Tech Auctions ��� Contact Us

 I.C.T. Intercontinental ��� PCB Handling Machine with CE

Software for PCB Manufacturing - Unisoft

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