3 It
must be remembered that when deposition tests are performed in the laboratory,
the deposition efficiency is
calculated by the formula: Weight
of metal deposited Deposition
Efficiency =
Weight of electrode consumed
This does not take stub loss into consideration.
The chart below shows how the laboratory established efficiency
is effected by the length of the stub. Stub
Loss Correction Table for
Coated Electrodes 2"
3"
4"
5"
Electrode
Length
Efficiency
STUB
STUB
STUB
STUB
60.0%
50.0%
45.0%
40.0%
35.0%
12"
65.0%
54.2%
46.7%
43.3%
37.9%
(300 mm)
70.0%
58.3%
52.5%
46.6%
40.8%
Electrode
75.0%
62.5%
56.2%
50.0%
43.7%
80.0%
66.6%
60.0%
53.3%
46.6%
60.0%
51.4%
47.1%
42.9%
38.3%
14"
65.0%
55.7%
51.1%
46.4%
41.0%
(350 mm)
70.0%
60.0%
55.0%
50.0%
45.0%
Electrode
75.0%
64.3%
56.9%
53.6%
46.2%
80.0%
68.5%
62.8%
57.1%
51.4%
60.0%
53.3%
50.0%
46.6%
43.3%
18"
65.0%
57.7%
54.2%
50.5%
46.9%
(450 mm)
0.0%
62.2%
56.3%
54.4%
50.5%
Electrode
75.0%
66.6%
62.5%
56.3%
54.2%
80.0%
71.1%
66.6%
62.2%
57.7%
(125
mm)
(100
mm)
(75
mm)
(50
mm)
Deposition
