79
5.Reference of Welding Standard
(
DVS2207-1-1995
)
5
.1 Because of difference in welding standard and PE material, the time and pressure vary in
different phases of welding. It suggests that the actual welding parameters should be offered
by pipes and fittings’ manufacturers.
5.2 Reference standard DVS2207-1-1995
熔 接 压
t5
t2
t3
t4
吸 热 压
(
Bead build-up pressure
)
Welding pressure =
(
P1
)
P3+Drag pressure
Section of welding pipe ends
welding pressure =
× 0.15 + Drag pressure
(
MPa
)
Total section of cylinders
Note:The drag pressure is not more than 50% of the welding pressure.
Wall
Thickness
(
mm
)
Bead
height
(
mm
)
Bead
build-up
pressure
(
MPa
)
Soaking
time
t
2
(
sec
)
Soaking
pressure
(
MPa
)
Change-
over time
t
3
(
sec
)
Pressure
build -up
time
t
4
(
sec
)
Welding
pressure
(
MPa
)
Cooling
time
t
5
(
min
)
0
~
4.5
0.5
0.15
45
≤
0.02
5
5
0.15±0.01
6
4.5
~
7
1.0
0.15
45
~
70
≤
0.02
5
~
6
5
~
6
0.15±0.01
6
~
10
7
~
12
1.5
0.15
70
~
120
≤
0.02
6
~
8
6
~
8
0.15±0.01
10
~
16
12
~
19
2.0
0.15
120
~
190
≤
0.02
8
~
10
8
~
11
0.15±0.01
16
~
24
19
~
26
2.5
0.15
190
~
260
≤
0.02
10
~
12
11
~
14
0.15±0.01
24
~
32
26
~
37
3.0
0.15
260
~
370
≤
0.02
12
~
16
14
~
19
0.15±0.01
32
~
45
37
~
50
3.5
0.15
370
~
500
≤
0.02
16
~
20
19
~
25
0.15±0.01
45
~
60
50
~
70
4.0
0.15
500
~
700
≤
0.02
20
~
25
25
~
35
0.15±0.01
60
~
80
Section of welding pipe ends = 3.14 ×(Pipe diameter - Wall thickness
)
× Wall thickness
Bead pressure
Welding pressure
Soaking pressure
Time
Summary of Contents for ROWELD E Series
Page 1: ...1 ...
Page 22: ...22 7 Electrical draw diagram and Hydraulic schematic diagram 7 1 Electrical draw diagram ...
Page 23: ...23 7 2 Hydraulic schematic diagram ...
Page 53: ...53 7 Electrical draw diagram and Hydraulic schematic diagram 7 1 Electrical draw diagram ...