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29
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9. WELDING PREPARATION
(Continued)
(3) Example Welding Conditions of I Shape Butt without Backing Plate
Plate
thickness
t (mm)
Root
gap
g (mm)
Wire
diameter
Ø(mm)
Number
of
layers
Welding
current
(A)
Welding
voltage
(V)
Travel
speed
(cm/min)
CO
2
gas
flow rate
(L/min)
1.2 0
0.9,
1.0
1 70
~
80 17
~
18 45
~
55
10
1.6 0
0.9,
1.0
1 80
~
100 18
~
19 45
~
55 10
~
15
2.0
0
~
0.5
0.9, 1.0
1
100
~
110 19
~
20 50
~
55 10
~
15
2.3
0.5
~
1.0
0.9
~
1.2
1
110
~
130 19
~
20 50
~
55 10
~
15
3.2
1.0
~
1.2 0.9
~
1.2
1
130
~
150 19
~
21 40
~
50 10
~
15
4.5
1.2
~
1.5
1.2 1
150
~
170 21
~
23 40
~
50 10
~
15
6.0
1.2
~
1.5
1.2 2
Front 1
Back 1
220
~
260 24
~
26 40
~
50 15
~
20
9.0
1.2
~
1.5
1.2 2
Front 1
Back 1
320
~
340 32
~
34 45
~
55 15
~
20
(4) Example Welding Conditions of Single and Double Grooves
Bevel
shape
Plate
thickness
t(mm)
Root
gap
g (mm)
Root
face
h(mm)
Wire
dia.
Ø (mm)
Number
of
layers
Welding
current
(A)
Welding
voltage
(V)
Travel
speed
(cm/min)
CO
2
gas
flow rate
(L/min)
12
0
~
0.5 4
~
6
1.2 2
Front
300
~
350
32
~
35
30
~
40 20
~
25
Back
300
~
350
32
~
35
45
~
50 20
~
25
1.6 2
Front
380
~
420
32
~
35
35
~
50 20
~
25
Back
380
~
420
32
~
35
45
~
50 20
~
25
16
0
~
0.5 4
~
6
1.2
2
Front
300
~
350
32
~
35
30
~
40 20
~
25
Back
300
~
350
32
~
35
45
~
50 20
~
25
1.6 2
Front
380
~
420
32
~
35
35
~
50 20
~
25
Back
380
~
420
32
~
35
45
~
50 20
~
25
16 0
4
~
6
1.2 2
Front
300
~
350
32
~
35
30
~
35 20
~
25
Back
300
~
350
32
~
35
30
~
35 20
~
25
1.6 2
Front
380
~
420
36
~
39
35
~
40 20
~
25
Back
380
~
420
36
~
39
35
~
40 20
~
25
19 0
5
~
7
1.6 2
Front 1
400
~
450
36
~
42
25
~
30 20
~
25
Back 2
400
~
450
36
~
42
25
~
30 20
~
25
1.6 4
Front 1
400
~
420
36
~
39
40
~
45 20
~
25
Back 2
400
~
420
39
~
42
30
~
35 20
~
25
25 0
5-7
1.6
4
Front 1
400
~
420
36
~
39
40
~
45 20
~
25
Back 2
400
~
450
39
~
42
30
~
35 20
~
25
Wminfo