Computational study of capillary tube failure used for laser jet soldering process

Name: Suparoj Premjarunan

keyword: Cemented carbide

LCSH: Solder and soldering

; Capillary tube

LCSH: Failure analysis (Engineering)

; Solder ball bumper jet

LCSH: Finite element method

LCSH: Flux (Metallurgy)

Abstract: The new method of laser-based solder jetting technology, Solder Ball Bumper Jet (SB2-Jet) have been developed to fulfill all the needs of fluxless soldering process providing high throughput for most of requirements for today’s packaging of optoelectronics. The geometry of capillary can affect the accuracy of the process and capillary must be changed once unacceptable surface defect or wear is observed. Capillary usually made of cemented carbide (WC-Co) due to high wear resistance and high mechanical properties at elevated temperature. This study aims to study the failure of capillary in SB2-Jet based on computational technique. CFD was carried out to investigate the molten solder flow behavior including flow velocity and fluid pressure acting on the capillary surface. CFD results were employed in the FEM to simulate the loading conditions at the capillary inner surface due to such molten solder flow to investigate the stress distribution. Different failure types were investigated, i.e., fluid jet erosion, particle erosion and thermal fatigue, and the results showed that dominated case of failure was impingement of WC particle. The effect of particle impact parameters, i.e., impact angle and WC particle size, on failure of capillary tip was also studied. The impact angle of 10, 30, 60, 90 degrees and particle size of 0.5, 0.75, 1 micron were considered. The result showed that higher angle of impact and larger particle size led to higher wear volume. An attempt to improve material properties with cryogenic treatment has been recently observed. Hence, study on particle induced failure on treated WC-Co capillary was also studied. It was observed that improvement WC-Co with cryogenic treatment result in smaller wear volume expected compared to untreated WC-Co. The results of this study could be very useful as a guideline to improve capillary material and soldering process to increase service life or minimize the chance of unexpected short time failure.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Name: Karuna Tuchinda

Role: thesis advisor

Email : karuna.t@tggs.kmutnb.ac.th

Name: Kittichai Sojiphan

Role: thesis advisor

Email : kittichai.s@cit.kmutnb.ac.th

Created: 2022

Modified: 2567-08-27

Issued: 2024-08-27

วิทยานิพนธ์/Thesis

application/pdf

eng

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