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Sandvik 29.9.R (Covered electrodes)
Sandvik 29.9.R is a covered electrode with rutile-basic coating and about 110% metal recovery giving a duplex (ferritic-austenitic) all weld metal. It is used for welding of dissimilar materials, high carbon and manganese steels like tool steels as well as surfacing. Sandvik 29.9 R is also used for overlays on hot forming steels and as a universal electrode for repair and maintenance work.
Scaling resistant up to 1150oC (2100oF). Spray transfer gives a bead with a finely rippled surface. Little spatter and very good slag removal.
Standards
- AWS E312-16
- EN number E 29 9 R
Product standards
- EN ISO 1600
- ASME/AWS SFA5.4
Chemical composition - weld metal
The following data are valid for non heat-treated all-weld metal.
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Ni
|
|---|---|---|---|---|---|---|
|
<0.10
|
0.8
|
1.5
|
<0.04
|
<0.025
|
28.5
|
10
|
Microstructure - weld metal
Austenitic matrix with a ferrite content of about 30%.
Mechanical properties - weld metal
|
Temperature
|
°C
|
20
|
|---|---|---|
|
Proof strength, RP0.2a
|
MPa
|
600
|
|
Tensile strength, Rm
|
MPa
|
720
|
|
Elongation, A
|
%
|
25
|
|
Reduction of area
|
%
|
25
|
|
Impact strength, Charpy V
|
J
|
50
|
|
Hardness, Vickers
|
220
|
a Rp0.2 corresponds to 0.2% offset yield strength
Corrosion properties - weld metal
Sandvik 29.9.R is resistant to intercrystalline corrosion according to DIN 50914 in the as-welded and quench-annealed condition.
Deposition data
|
Electrode diameter, mm
|
2.5
|
3.25
|
4.0
|
|---|---|---|---|
|
Length, mm
|
300
|
350
|
350
|
|
Weights: kg/100 pcs
|
2.0
|
4.0
|
5.9
|
|
kg/box
|
1.6
|
2.0
|
1.9
|
|
Electrodes/box
|
79
|
50
|
32
|
|
Max deposition rate, kg weld metal/h, approx
|
0.9
|
1.3
|
2.0
|
|
Effective value kg weld metal/kg electrodes
|
0.64
|
0.62
|
0.65
|
|
Change value Electrodes/kg weld metal
|
78
|
48.5
|
26
|
|
Burn-off time per electrode at max current, s
|
48
|
56
|
66
|
|
Welding positions
|
diameter <=3.25 mm
|
all except vertical down
|
|---|---|---|
|
diameter >=4.0 mm
|
preferably flat position
|
|
|
Current/polarity
|
direct current/electrode positive or alternating current at an open circuit voltage of at least 50V
|
|
Further information
| Diameter, mm | 2.5 | 3.25 | 4.0 |
|---|---|---|---|
| Current, A | 50-85 | 80-125 | 110-175 |
| Fume classification *) | R4 | R5 | R6 |
*)According to Swedish standard (SS) 06 28 01 Redrying of the electrodes when necessary: 2h/300 oC
