LIBRARY ı6ıul 0) - Cranfield University

Appendix J
This appendix shows the welding data collected from the stand-off slope trials
carried out with the welding parameters shown in Table 6.6 to measure the
proportionality constant, 4), which is used in the stand-off estimation model shown in
equations 2.22 and 2.23.
The constant value is obtained by dividing the slope of the linear function' that
fits the points ESOk by the slope of the linear function that best fits the cumulative
differences in welding current, E(Im ,, k- Imean,
(k. 1)) (see equation 6.6). Note that the
intercept of the latter will not be taken into account due to the fact that it corresponds
to an offset which is probably caused by random noise present in the measurement of
the initial value of welding current, I.,,, o.
The following tables and graphs show the welding data collected from the
trials and the fitted lines from which the value of 0 was calculated. The 0 values
obtained in this Appendix are shown in the Table 6.6 and are compared with the
corresponding 0 values estimated using equation 6.5. The results are plotted in Figure
6.9.
Table J. 1 - Welding data collected from stand-off slope trial "s15 2001"
Time
[ms]
SO
[mm]
I..
[A]
ASO
[mm]
E[Imcan, k-1Ica,,. (W)]
A
0 15 148.6 0 0
512 15.63506 144.9 0.635059
1024 16.27012 143.2 1.270118
1536 16.90518 142.3 1.905178
2048 17.54024 139.9 2.540237
2560 18.1753 138.2 3.175296
3072 18.81036 136.4 3.810355
3584 19.44541 134.5 4.445414
4096 20.08047 132.3 5.080474
WFS =5 m/min
Vset = 21.3 V
---
---------
' y(x) = ax+b, a= slope, b= intercept
Sw = 0.6 m/min
Vreq = 19.4 V
251
-3.7
-5.4
-6.3
-8.7
-10.4
-12.2
-14.1
-16.3