The significant problems of laser welding, particularly by a pulsed laser, are formation of various welding defects such as porosity, cracking and undercutting. In order to reduce these defects, the authors have developed a special laser with pulse shaping function. The paper describes the effects of pulse shaping on reduction of porosity and weld cracking of spot welding of difficult materials such as Al-alloys and stainless steels. By the selection of optimum pulse shape the defects can be drastically reduced and the sound weld is possible to obtain.

Topics
Lasers, Alloys, Fracture mechanics, Welding
1.
H.
Simidzu
,
F.
Yoshino
,
S.
Katayama
 &
A.
Matsunawa
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Proc. of LAMP’92 (Intn’l Conf. on Laser Advanced Materials Processing)
,
7-12 June, 1992
,
Nagaoka, Japan
,
High Temperature Soc. of Japan
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1
, p.
511
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516
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2.
S.
Katayama
,
M.
Mizutani
,
H.
Simidzu
 &
A.
Matsunawa
:
Proc. of LAMP’92
,
7-12 June, 1992
,
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,
High Temperature Soc. of Japan
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1
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361
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366
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A.
Matsunawa
,
S.
Katayama
,
M.
Mizutani
,
H.
Ikeda
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K.
Nishizawa
:
Proc. of 5e CISFFEL (Colloque International sur le Soudage et la Fusion par Faisceaux et Laser)
,
14-18 Jun, 1993
,
Labaule, France Tome 1
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226
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4.
S.
Katayama
,
S.
Kosaka
,
M.
Mizutani
,
K.
Nishizawa
 &
A.
Matsunawa
:
Proc, of ICALEO’93
,
24-28, October, 1993
,
Orlando, USA
, p.
487
–
497
.
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© 1994 Laser Institute of America.
1994
Laser Institute of America
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