Laser Welding Characterization of Kovar and Stainless Steel Alloys as Suitable Materials for Components of Photonic Devices Packaging

Journal Article · Wed Mar 10 23:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3377802· OSTI ID:21371669

Fadhali, M M. A.; Zainal, Saktioto J; Munajat, Y; Jalil, A; Rahman, R ^[1]

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1. Institute of Advanced Photonic Sciences, Faculty of Science, Universiti Technologi Malaysia, 81310 Skudai, Johor (Malaysia)

The weldability of Kovar and stainless steel alloys by Nd:YAG laser beam is studied through changing of some laser beam parameters. It has been found that there is a suitable interaction of the pulsed laser beam of low power laser pulse with both the two alloys. The change of thermophysical properties with absorbed energy from the laser pulse is discussed in this paper which reports the suitability of both Kovar and stainless steel 304 as the base materials for photonic devices packaging. We used laser weld system (LW4000S from Newport) which employs Nd:YAG laser system with two simultaneous beams output for packaging 980 nm high power laser module. Results of changing both laser spot weld width and penetration depth with changing both the pulse peak power density, pulse energy and pulse duration show that there are good linear relationships between laser pulse energy or peak power density and pulse duration with laser spot weld dimensions( both laser spot weld width and penetration depth). Therefore we concluded that there should be an optimization for both the pulse peak power and pulse duration to give a suitable aspect ratio (laser spot width to penetration depth) for achieving the desired welds with suitable penetration depth and small spot width. This is to reduce the heat affected zone (HAZ) which affects the sensitive optical components. An optimum value of the power density in the order of 10{sup 5} w/cm{sup 2} found to be suitable to induce melting in the welded joints without vaporization. The desired ratio can also be optimized by changing the focus position on the target material as illustrated from our measurements. A theoretical model is developed to simulate the temperature distribution during the laser pulse heating and predict the penetration depth inside the material. Samples have been investigated using SEM with EDS. The metallographic measurements on the weld spot show a suitable weld yield with reasonable weld width to depth ratio.

• OSTI ID: 21371669
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1217; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY-FE53NI29CO18
ALLOYS
AUSTENITIC STEELS
CARBON ADDITIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
COBALT ALLOYS
CORROSION RESISTANT ALLOYS
ELECTRON MICROSCOPY
EVAPORATION
FABRICATION
HEAT AFFECTED ZONE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
KOVAR
LASER WELDING
LASERS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS
MELTING
METALLOGRAPHY
MICROSCOPY
NEODYMIUM LASERS
NICKEL ALLOYS
OPTIMIZATION
PEAK LOAD
PENETRATION DEPTH
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POWER DENSITY
SCANNING ELECTRON MICROSCOPY
SOLID STATE LASERS
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
TEMPERATURE DISTRIBUTION
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT ALLOYS
WELDABILITY
WELDED JOINTS
WELDING
ZONES