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COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
IX Line
5 - Cost of Power - $ .045/kWh (given).
Volts & Amperes - 25V and 250A
(given). Constant
- The 1,000 already entered, is a constant necessary to convert to
watt-hours. Deposition
Rate - 5.36 lbs/hr as used in Line 1. The
cost of electrical power to deposit one pound of weld metal
can now be calculated
as $.052. Line
6 - Total Lines 1, 2, and 5 to find the total cost of depositing
one pound weld metal.
The total of $19.60. 9.4.2
Calculating The Cost Per Foot of
Deposited Weld Metal Calculating
the weight of weld metal requires that we consider the following items.
a. Area
of the cross-section of the weld. b.
Length of the weld.
c. Volume
of the weld in cubic inches. d.
Weight of the weld metal per cubic
inch. 9.4.2.1
In the fillet weld show in Figure 13,
we know that the area of the cross-section (the triangle)
is equal to one-half the base times the height, the volume of the weld is equal
to the area times
the length, and the weight of the weld then, is the volume times the weight of
the material (steel)
per cubic inch. 9.4.2.2
We can then write the formula:
Weight of Weld Metal = ½ x
Base x Height x Length x Weight of Material
Substituting the values from Figure
13, we have: Wt/Ft
= .5 x .5 x .5 x 12 x .283
= .4245 lbs 9.4.2.3
Weights may vary depending on the density
of the particular material you are at- tempting
to calculate. The chart in Figure 14 will eliminate the need for these calculations
for steel fillet
and butt joints, since it lists the weight per foot directly.
9.4.2.4 Estimating
the weight per foot of a weld using the chart, requires that you make a
drawing of the weld joint to exact
scale, and dimension the leg lengths, root gap, thickness,
angles and other pertinent measurements
as shown in Figure 15. Divide the cross-section of
the weld into right triangles and rectangles
as shown. Sketch in the reinforcement, i.e., the
