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ใช้เชื่อมต่อฮีตเตอร์ที่หักหรือขาดจากการใช้งาน

 

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
Chemical composition, wt%
<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
Electrode data
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
Working data
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, mm2.53.254.0
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


 


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