Spin Welder User’s Manual
Section 5 – Theory of Operation
Page 33
Page 32
Dukane Manual Part Number 403-547-03
Dukane Manual Part Number 403-547-03
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:
RPM =
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.
60 v
π D
2000
3000
4000
0
1000
1
2
4
6
8
10
12
3
RPM
Average Weld Diameter (inch)
D
Rotational Velocity (rev/min)
v = 240
v = 360
v = 480
v = 12
0
v =
600
v = 720
v = 960 in/sec
v = 840
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
Figure 5–3
Dependence of Motor RPM on the Weld Diameter for Selected Surface Speeds
