348
Y. Shi et al.
Table. 10.5 Coding design
[34]
Classifier 1 Classifier 2 Classifier 3
Partial penetration
1
1
0
Full penetration
−1
0
1
Excessive penetration
0
−1
−1
Table. 10.6 Chemical composition of duplex stainless steel (wt.%)
Element
Cr
Ni
Mn
Si
C
N
Fe
wt.%
21.52
1.56
4.98
0.49
0.017
0.21
Bal.
of welded joints is introduced. Before welding, the surfaces of the workpieces to be
welded were mechanically cleaned to remove oil and impurities to ensure the quality
of the welded joints. To ensure the quality of the weld, the pure argon gas is passed
on the surface of the workpiece during welding.
10.4.1 Effect of the Welding Parameters on the Weld
Geometry Profile
Bead depth (D) and bead width (W ) are the main parameters that characterize the
geometry profile (GP) of the weld. Weld GP can reflect the quality of the weld. In
the K-TIG welding process, D and W can be change with the change of welding
parameters. Therefore, it can optimize the welding process through the weld GP
under different welding parameters. Find the best welding parameters for welding
duplex stainless steel. In this chapter, the K-TIG welding parameters are presented
in Table 10.7.
Table. 10.7 Process
parameters of K-TIG welding
of S32101 duplex stainless
steel [38]
Test no. Welding current
(A)
Welding speed
(mm/min)
Arc voltage (V)
1
470
210
16.5
2
490
210
17.0
3
510
210
17.5
4
530
210
18.0
5
550
210
18.5
6
530
240
18.0
7
530
270
18.0
8
530
300
18.0