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SMTnet Express, August 17, 2017, Subscribers: 30,720, Companies: 10,649, Users: 23,665

Technical Library

The Effect of Vacuum Reflow Processing On Solder Joint Voiding And Thermal Fatigue Reliability

Richard Coyle, Richard Popowich, Charmaine Johnson - Nokia Bell Labs, Dave Hillman - Rockwell Collins, Michael Barnes, David Heller - Heller Industries Inc., Richard Parker - iNEMI, Keith Howell - Nihon Superior, Joerg Trodler - Heraeus, Adam Murling - Indium

A test program was developed to evaluate the effectiveness of vacuum reflow processing on solder joint voiding and subsequent thermal cycling performance. Area array package test vehicles were assembled using conventional reflow processing and a solder paste that generated substantial void content in the solder joints. Half of the population of test vehicles then were re-processed (reflowed) using vacuum reflow. Transmission x-ray inspection showed a significant reduction in solder voiding after vacuum processing. The solder attachment reliability of the conventional and vacuum reflowed test vehicles was characterized and compared using two different accelerated thermal cycling profiles. The thermal cycling results are discussed in terms of the general impact of voiding on solder thermal fatigue reliability, results from the open literature, and the evolving industry standards for solder voiding. Recommendations are made for further work based on other void reduction methods and additional reliability studies.

Forum search results for related keywords: voiding, vacuum reflow, thermal fatigue, thermal cycling, lead-free alloys.

SMT / PCB Products



GPD Global

Pick & Place




Solder Paste Stencils

BEST, Inc.

Selective Soldering




Hand Assembly

Virtual Industries















PDR America

SMT / PCB Equipment Auctions

Complete Closure 115,000 SF Facility

Universal, YesTech, MPM, Terradyne and more...

September 19 - 20 | X-Line

Items From EM Solutions

MYDATA MY9, ACE Kiss, & more...

August 21 - 24 | Baja Bid

Electronic Equipment Mart

PCB Conveyors


JMW Enterprises

Agilent 8722D 40 Ghz Network Analyzer

Test & Measurement Products

X-Line Asset Management

HMI MSP-485 Semi Auto

Screen Printing Equipment

Recon Inc

Koh Young KY-3030 VAL 3D

Inspection Equipment

Capital Equipment Exchange

Assembleon MC1

Chipshooters / Chip Mounters

IBE SMT Equipment

Electrovert Econopak II/16F

Wave Solder Equipment

Baja Bid

Events Calendar

Capital Expo & Tech Forum | August 24 | SMTA

IPC & WHMA Wire Harness Manufacturing Conference | October 3 | IPC

NEPCON South China - SMT and Electronics Manufacturing Expo | August 29 - 31 | Reed Exhibitions

Training Courses

IPC Training & Certification Courses

Soldering & PCB Rework Courses

PCB Cleaning Webinar Series | ZESTRON Corporation

Career Center

Manufacturing Engineering Manager

Eden Prairie, MN

Logic PD, Inc.


Dorval (Montreal), Canada

Cancino Technologies Corporation

Senior Design Engineer

Murphy, NC

Aegis Power Systems

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

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.


Used PCB Assembly Equipment - CE Exchange

Experience the Blackfox Difference - Premier IPC Training & Certification Center

Software for PCB Manufacturing - Unisoft

Why Use Plasma Treatment Prior To Conformal Coating. Download the 'The Effects of Plasma Treatment Prior to Conformal Coating' White Paper.

Speedprint SP700avi inline SMT screen printer

Metcal CV-5200 Connection Validation Soldering System

Custom SMT Nozzles and Tools - Count on Tools

Fully automatic selective soldering stations - 1 Click SMT - Inline with multiple modules, or standalone for cost effective soldering solutions.

Fluid DISPENSING pumps for integration into your system - GPD Global

Vacuum Tweezers - pick up small components with ease

SMT, PTH, AOI & Test Equipment

HELLER - Choose an Oven for Your Reflow Needs

KIC - Making Reflow Ovens Smarter

MIRTEC MV 6 OMNI High-Speed / High-Performance 3D AOI

Used SMT Equipment - IBE

PCB Cleaning products - Zestron

Quality Pre-Owned SMT Eequipment - Robo-Tek

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