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 language | English |
|---|---|
| Pages (from-to) | 419-424 |
| Number of pages | 6 |
| Journal | Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering |
| Volume | 80 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2014 |
| Externally published | Yes |
Fingerprint
Keywords
- Aluminum alloy
- Diode laser
- Heat conduction
- Hybrid system
- Key-hole
- Pulsed Nd:YAG laser
ASJC Scopus subject areas
- Mechanical Engineering
Cite this
The boundary of key-hole generation in micro-welding of aluminum alloy by pulsed Nd : YAG laser with superposition of continuous diode laser. / Nakashiba, Shin Ichi; Okamoto, Yasuhiro; Sakagawa, Tomokazu; Harada, Masanori; Okada, Akira.
In: Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering, Vol. 80, No. 4, 2014, p. 419-424.Research output: Contribution to journal › Article
}
TY - JOUR
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.
KW - Aluminum alloy
KW - Diode laser
KW - Heat conduction
KW - Hybrid system
KW - Key-hole
KW - Pulsed Nd:YAG laser
UR - http://www.scopus.com/inward/record.url?scp=84988579127&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84988579127&partnerID=8YFLogxK
U2 - 10.2493/jjspe.80.419
DO - 10.2493/jjspe.80.419
M3 - Article
AN - SCOPUS:84988579127
VL - 80
SP - 419
EP - 424
JO - Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering
JF - Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering
SN - 0912-0289
IS - 4
ER -