Miller Electric IH Owner's Manual page 27

Step to 600 F
Ramp to 1350 F
as fast as
@ 600 /hr
possible*
SEG.n SEG.n
1
tYPE tYPE
StEP rmP.r
(step) (ramp rate)
tGt tGt
600 1350
(deg) (deg)
rAtE
600
(deg/ hr)
1400
1200
1000
800
600
400
200
0
Figure 6-2. Setting Stress Relief Profile Using Example Parameters
Dwell @ 1350
F for 1/2 hour
SEG.n
2 3
tYPE
dwEl
(soak)
dur
0.5
(in hrs)
Example Stress Relief Profile
0 30 60 90
Time (minutes)
.
*On small diameter pipe, it may be necessary to reduce the
output of the power source to achieve a "reasonable rate" in
Segment 1; thereafter, the program controls the rate of
temperature rise and the output power may be increased to
full if desired. To reduce output power, turn power source
output knob to desired setting.
Ramp to 600 F
@ 600 /hr
SEG.n
4
tYPE
rmP.r
(ramp rate)
tGt
600
(deg)
rAtE
600
(deg/hr)
120 150 180 210
Free fall to
ambient
SEG.n
5
tYPE
End
(end)
End.t
S OP
(sets output to 0)
240 270
OM-203 185 Page 23