- Applications
- Butt and that fillet welding of bridges and API Line-pipe. (longitudinal)
- Characteristics on Usage
-
- - WF-771 X WS-12K are well suited for high speed welding in thin plate.
It is comparatively insensitive to rust, scales, oil and dirt and primers on the surface to be welded,
Slag detachability and bead appearance are very good.
Suitable for welding of thin and medium plate in high speed welding.
As the consumption of flux is low, it is very economical.
- Notes on Usage
-
- - Dry the flux at 300~350℃ (572~662℉) for 60 minutes before use.
- - When the flux height is excessive, poor bead appearance may occur.
- - Use welding current and speed as low as possible at the first layer of groove to avoid cracking.
- Typical Welding Conditions
-
Typical Welding Conditions
Th
(mm) |
Dia
(mm) |
Groove Design |
Pass |
Amp
(A) |
Volt
(V) |
Speed
(CPM) |
Remarke |
| 25 |
4.0 |
|
1~15 |
550 |
29 |
40~45 |
AWS
A5.17 |
| 44 |
4.0 |
|
1st |
500 |
32 |
40 |
Both Side
Single-pass |
| 2st |
500 |
32 |
40 |
- Typical Chemical Composition of All-Weld-Metal (%)
-
Typical Chemical Composition of All-Weld-Metal (%)
| C |
Si |
Mn |
P |
S |
BM |
| 0.06 |
1.67 |
0.46 |
0.021 |
0.014 |
SS41(25) |
| 0.07 |
1.52 |
0.44 |
0.019 |
0.013 |
SM50A(20) |
- Typical Mechanical Properties of All-Weld-Metal
-
Typical Mechanical Properties of All-Weld-Metal
Y.S
N/㎟(kg/㎟) |
T.S
N/㎟(kg/㎟) |
EL
(%) |
CVN-lmpact Value J (ft·lbs) |
BM
(mm) |
PWHT |
| -0℃ |
-29℃ |
| 468(48) |
560(57) |
28 |
70(7.1) |
40(4.0) |
SM41(25) |
AW |
| - |
576(59) |
- |
50(5.1) |
- |
SM50A(20) |
AW |