Miller Electric IH Example Multi−Step Stress Relief Profile, Ramp to 800 F Ramp to 600 F, Deg/hr

Step to 600° F as fast as possible

Ramp to 800° F

@ 400° /hr

Ramp to 1250° F	Dwell @ 1250° F	Ramp to 800° F	Ramp to 600° F
@ 200° /hr	for 1 hour	@ 200° /hr	@ 400° /hr

Free fall to ambient

SEG.n

1

tYPE StEP

(step)

tGt 600

(deg)

SEG.n

2

tYPE rmP.r

(ramp rate)

tGt 800

(deg)

rAtE 400

(deg/ hr)

SEG.n

3

tYPE rmP.r

(ramp rate)

tGt 1250

(deg)

rAtE 200

(deg/ hr)

SEG.n

4

tYPE dwEl

(soak)

dur 1.0

(in hrs)

SEG.n

5

tYPE rmP.r

(ramp rate)

tGt 800

(deg)

rAtE 200

(deg/hr)

SEG.n		SEG.n
6		7
tYPE		tYPE
rmP.r		End
(ramp rate)		(end)
tGt		End.t
600		S OP
(deg)	(sets output to 0)
rAtE
400
(deg/hr)

Example Multi−Step Stress Relief Profile

	1400
	1200
	1000
F	800
Degrees
	600
	400
	200
	0
	0.0	1.0	2.0	3.0	4.0	5.0	6.0	7.0

Time (hours)

.*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.

Figure 6-3. Setting A Complex Stress Relief Profile With Multiple Temperature Rise/Cool Rates

Using Example Parameters

OM-203 185 Page 24