pre heating cs condenser wall
pre heating cs condenser wall
(OP)
we are cutting out and repairing our condenser wall. the thickness is 5/8. is there a need to preheat before welding
thanks
thanks
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pre heating cs condenser wall
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RE: pre heating cs condenser wall
By the way, I would use a flush patch plate to repair the condenser wall. This requires a full penetration weld. Don't forget to perform NDT (wet fluorescent MT) after the weld repair.
RE: pre heating cs condenser wall
Calculate the carbon equivalents (CET).
CET = C + (Mn + Mo)/10 + (Cr + Cu)/10 + Ni/40 (%).
It applies to the following range of concentrations (percentage by weight):
- Carbon 0,05 to 0,32
- Silicon max. 0,8
- Manganese 0,5 to 1,9
- Chromium max. 1,5
- Copper max. 0,7
- Molybdenum max. 0,75
- Niobium max. 0,06
- Nickel max. 2,5
- Titanium max. 0,12
- Vanadium max. 0,18
- Boron max. 0,005
You have to know the hydrogen content of your filler material (HD).
This is normally given by the manufacturer on the casing (here applicable in the range1 mg/100 g weld material to 20 mg/100 g weld material).
Working temperature, Tp is calculated as:
Tp = 697xCET + 160 tanh (d/35) + 62xHD^0,35 + (53xCET-32)xQ –328 (°C)
Plate thickness = d (mm)
Q = heat input I kJ/mm
Q may be calculated as follows:
Q = k (( U x I)/v)x 1E-3 (kJ/mm)
U = Volt
I = Current in Ampere
v = welding speed
k-factor below:
121 Submerged arc welding with wire electrode 1,0
111 Metal-arc welding with covered electrode 0,8
131 MIG welding 0,8
135 MAG welding 0,8
114 Flux-cored wire metal-arc welding without gas shield 0,8
136 Flux-cored wire metal-arc welding with active gas shield 0,8
137 Flux-cored wire metal-arc welding with inert gas shield 0,8
138 Metal-cored wire metal-arc welding with active gas shield 0,8
139 Metal -cored wire metal-arc welding with inert gas shield 0,8
141 TIG welding 0,6