Two grades of 3 mm thick Stainless Steels (316 LN and Ferritic-Martensitic) have been butt welded using CO2 Laser Beam Welding under different conditions. The influence of various laser welding conditions on bead morphology, cracking susceptibility, hardness, tensile and impression creep properties were investigated.

It was observed that weld bead configuration is gradually changed from wine cup to well type with change to higher power and higher welding speed. Results of tensile tests have indicated that type 316 LN stainless steel can be laser welded such that the weldments maintain their UTS and ductility but not YS. On the other hand, laser welds of Ferritic-Martensitic stainless steel exhibited similar strength (both YS and UTS) but lower ductility than the base metal. The impression creep technique has been employed at 923° K to investigate the creep behaviour of laser welded stainless steels.

Topics
Laser beam welding, Mechanical properties, Creep behavior
1.
Schaeffler
,
A. L.
, ‘
Constitution diagram for stainless steelweld metal
’,
Metal Progress
,
1949
,
56
(
11
), p.
680
Google Scholar
 
2.
Hull
,
F. C.
, ‘
Effect of delta ferrite on hot cracking of stainless steel
’,
Welding Journal
,
1967
,
46
(
9
), p.
399-S
Google Scholar
 
3.
Kotecki
,
D.
, and
Siewart
,
T. A.
, ‘
WRC-1992 Constitution diagram for stainless steel weld metals: a modification to the WRC-1988 diagram
’,
Welding Journal
,
1992
,
71
(
5
), p.
171-S
Google Scholar
 
4.
T. P. S.
Gill
,
M.
Vijayalakshmi
,
P.
Rodriguez
, and
K. A.
Padmanabham
:
Metall, Trans.
,
1989
,
20A
, p.
1115
https://doi.org/10.1007/BF02650146
Google Scholar
Crossref
Search ADS
 
5.
G. J.
Lloyd
,
E.
Barker
, and
R.
Pilkington
:
Mater. Sci. Eng.
,
1985
,
74
, p.
159
https://doi.org/10.1016/0025-5416(85)90429-X
Google Scholar
Crossref
Search ADS
 
6.
S. A.
David
,
J. M.
Vitek
, and
T. L.
Hebble
., ‘
Welding Journal
’,
66
:
289s
,
1987
.
Google Scholar
 
7.
S.
Kou
 and
Y.
Le
., ‘
Metall. Trans.
’, 13A1141,
1982
.
Google Scholar
 
8.
M. J.
Cieslak
 and
P. W.
Fuerschbach
. ‘
Metall. Trans.
’,
19B
:
319
–
329
,
1988
.
https://doi.org/10.1007/BF02654217
Google Scholar
Crossref
Search ADS
 
9.
M. M.
Collur
,
A.
Paul
, and
T.
Deb Roy
. ‘
Metall. Trans.
’,
18B
:
733
–
740
,
1987
.
https://doi.org/10.1007/BF02672891
Google Scholar
Crossref
Search ADS
 
10.
Chu
,
S. N. G.
 and
Li
,
J. C. M.
;
J. Mat. Sci.
, Vol.
12
, p.
2200
to
2208
https://doi.org/10.1007/BF00552241
Crossref
Search ADS
 
11.
T.
Zacharia
,
A. H.
Eraslan
, and
D. K.
Aidun
., ‘
Welding Journal
’,
67
:
18s
,
1988
.
Google Scholar
 
12.
C.
Chen
.
J.
Majumdar
, and
M. M.
Chen
., ‘
A two dimensional transient model for convection in laser melted pool. Metall. Trans.
’,
15A
:
2175
,
1984
.
Google Scholar
 
13.
A.
Matsunowa
., ‘
JWRI
’,
11
(
2
),
1982
.
Google Scholar
 
14.
I.
Masumoto
,
K.
Tamaki
, and
M.
Kutsuma
., ‘
Hot cracking of austenitic stainless steel weld metal
.’,
Trans. JWS
,
41
(
11
):
1306
.
15.
S. A.
David
,
G. M.
Goodwin
, and
D.N.
Braski
., ‘
Solidification of behaviour of austenitic stainless steel filler metals
.’,
Welding Journal
,
58
(
11
):
330s
,
1979
.
Google Scholar
 
16.
V.
Kujanpaa
,
N.
Suutala
,
T.
Takalo
, and
T.
Moisio
., ‘
Correlation between solidification cracking and microstructure in austenitic and austenitic-ferritic stainless steels welds
.’
Welding Research Int.
,
9
(
2
):
55
,
1979
.
17.
J. C.
Lippold
, ‘
Solidification behaviour and cracking susceptibility of pulsed-laser welds in austenitic stainless steels
.’
Welding Journals
,
73
(
6
):
129s
–
139s
,
1994
Google Scholar
 
18.
S.
Katayama
 and
A.
Matsunawa
., ‘
In proceedings of the International Congress on Applications in Lasers and Electro-Optics
’,
San Fransisco
,
1985
19.
T.
Zacharia
,
S. A.
David
,
J. M.
Vitek
, and
T.
Deb Roy
, ‘
Heat transfer during Nd: YAG pulsed laser welding and its effect on solidification structure of austenitic stainless steels
’,
Metall. Trans.
,
20A
:
957
–
967
,
1989
.
https://doi.org/10.1007/BF02651661
Google Scholar
Crossref
Search ADS
 
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