Dukane SVB031 User Manual page 42

Spin Welder User's Manual
120 inch/sec (3 m/sec) have been used for parts with
thin wall sections. Figure 5–2 is a plot of surface
velocity (v) as a function of weld joint diameter (D)
for five different RPM settings (N). You can use this
graph to estimate the surface velocity (vertical axis),
that various RPM settings will yield for a given part
diameter (horizontal axis).
Note that we have converted all units to inches/sec-
ond for consistency. Some graphs mix part diameter
in inches with a surface velocity in feet/second. Be
careful to compare graphs in the same units. Solving
the previous expression for RPM gives us:
60 v
RPM =
π D
A plot of this expression is shown in Figure 5–3.
Now we have RPM plotted as a function of weld
joint diameter (D) for eight different values of v
ranging from 120 to 960 inch/sec.
4000
3000
2000
1000
RPM
0
D
Figure 5–3 Dependence of Motor RPM on the Weld Diameter for Selected Surface Speeds
Page 32
1 2 3
Average Weld Diameter (inch)
4 6
120 in/sec = 10 ft/sec — 3 m/sec
240 in/sec = 20 ft/sec — 6 m/sec
360 in/sec = 30 ft/sec — 9 m/sec
480 in/sec = 40 ft/sec — 12 m/sec
600 in/sec = 50 ft/sec — 15 m/sec
720 in/sec = 60 ft/sec — 18 m/sec
840 in/sec = 70 ft/sec — 21 m/sec
960 in/sec = 80 ft/sec — 24 m/sec
8 10
Dukane Manual Part Number 403-547-03
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