The boundary of key-hole generation in micro-welding of aluminum alloy by pulsed Nd: YAG laser with superposition of continuous diode laser

Shin Ichi Nakashiba, Yasuhiro Okamoto, Tomokazu Sakagawa, Masanori Harada, Akira Okada

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In micro-welding of aluminum alloy, its low melting point and high thermal conductivity make it difficult to obtain the large penetration depth with the good surface integrity. In order to perform the stable key-hole welding with little defects, it is important to understand the processing phenomenon near the boundary between heat conduction and key-hole type welding. Therefore, the boundary condition of key-hole generation in micro-welding of aluminum alloy was experimentally and numerically investigated with hybrid Nd:YAG laser system, in which a continuous diode laser (LD) of 808nm in wavelength was superposed in a pulsed Nd:YAG laser of l064nm in wavelength. It became clear that the keyhole generation became stable when the continuous LD was superposed with pulsed Nd:YAG laser, and the shorter pulse interval time and higher continuous LD power led to the generation of the key-hole. The results of numerical analysis made it clear that the superposition of continuous diode laser is effective to stabilize the key-hole generation in micro-welding of aluminum alloy by pulsed Nd:YAG laser, since the continuous diode laser could keep the temperature near the boundary condition of key-hole generation appeared at the time when the temperature of welded bead was around the boiling point.

Original languageEnglish
Pages (from-to)419-424
Number of pages6
JournalSeimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering
Volume80
Issue number4
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Semiconductor lasers
Aluminum alloys
Welding
Lasers
Boundary conditions
Wavelength
Boiling point
Heat conduction
Melting point
Numerical analysis
Laser pulses
Thermal conductivity
Temperature
Defects
Processing

Keywords

  • Aluminum alloy
  • Diode laser
  • Heat conduction
  • Hybrid system
  • Key-hole
  • Pulsed Nd:YAG laser

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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title = "The boundary of key-hole generation in micro-welding of aluminum alloy by pulsed Nd: YAG laser with superposition of continuous diode laser",
abstract = "In micro-welding of aluminum alloy, its low melting point and high thermal conductivity make it difficult to obtain the large penetration depth with the good surface integrity. In order to perform the stable key-hole welding with little defects, it is important to understand the processing phenomenon near the boundary between heat conduction and key-hole type welding. Therefore, the boundary condition of key-hole generation in micro-welding of aluminum alloy was experimentally and numerically investigated with hybrid Nd:YAG laser system, in which a continuous diode laser (LD) of 808nm in wavelength was superposed in a pulsed Nd:YAG laser of l064nm in wavelength. It became clear that the keyhole generation became stable when the continuous LD was superposed with pulsed Nd:YAG laser, and the shorter pulse interval time and higher continuous LD power led to the generation of the key-hole. The results of numerical analysis made it clear that the superposition of continuous diode laser is effective to stabilize the key-hole generation in micro-welding of aluminum alloy by pulsed Nd:YAG laser, since the continuous diode laser could keep the temperature near the boundary condition of key-hole generation appeared at the time when the temperature of welded bead was around the boiling point.",
keywords = "Aluminum alloy, Diode laser, Heat conduction, Hybrid system, Key-hole, Pulsed Nd:YAG laser",
author = "Nakashiba, {Shin Ichi} and Yasuhiro Okamoto and Tomokazu Sakagawa and Masanori Harada and Akira Okada",
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T1 - The boundary of key-hole generation in micro-welding of aluminum alloy by pulsed Nd

T2 - YAG laser with superposition of continuous diode laser

AU - Nakashiba, Shin Ichi

AU - Okamoto, Yasuhiro

AU - Sakagawa, Tomokazu

AU - Harada, Masanori

AU - Okada, Akira

PY - 2014

Y1 - 2014

N2 - In micro-welding of aluminum alloy, its low melting point and high thermal conductivity make it difficult to obtain the large penetration depth with the good surface integrity. In order to perform the stable key-hole welding with little defects, it is important to understand the processing phenomenon near the boundary between heat conduction and key-hole type welding. Therefore, the boundary condition of key-hole generation in micro-welding of aluminum alloy was experimentally and numerically investigated with hybrid Nd:YAG laser system, in which a continuous diode laser (LD) of 808nm in wavelength was superposed in a pulsed Nd:YAG laser of l064nm in wavelength. It became clear that the keyhole generation became stable when the continuous LD was superposed with pulsed Nd:YAG laser, and the shorter pulse interval time and higher continuous LD power led to the generation of the key-hole. The results of numerical analysis made it clear that the superposition of continuous diode laser is effective to stabilize the key-hole generation in micro-welding of aluminum alloy by pulsed Nd:YAG laser, since the continuous diode laser could keep the temperature near the boundary condition of key-hole generation appeared at the time when the temperature of welded bead was around the boiling point.

AB - In micro-welding of aluminum alloy, its low melting point and high thermal conductivity make it difficult to obtain the large penetration depth with the good surface integrity. In order to perform the stable key-hole welding with little defects, it is important to understand the processing phenomenon near the boundary between heat conduction and key-hole type welding. Therefore, the boundary condition of key-hole generation in micro-welding of aluminum alloy was experimentally and numerically investigated with hybrid Nd:YAG laser system, in which a continuous diode laser (LD) of 808nm in wavelength was superposed in a pulsed Nd:YAG laser of l064nm in wavelength. It became clear that the keyhole generation became stable when the continuous LD was superposed with pulsed Nd:YAG laser, and the shorter pulse interval time and higher continuous LD power led to the generation of the key-hole. The results of numerical analysis made it clear that the superposition of continuous diode laser is effective to stabilize the key-hole generation in micro-welding of aluminum alloy by pulsed Nd:YAG laser, since the continuous diode laser could keep the temperature near the boundary condition of key-hole generation appeared at the time when the temperature of welded bead was around the boiling point.

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