©
COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
IX and tables
that provide average values that you may use. Electrode manufacturers will
usually supply
the deposition data you need through their Technical Services Department, if it
is not already
published in their literature. 9.2 FACTORS
FOR COST FORMULAS 9.2.1
Labor
and Overhead - Labor and overhead may be considered jointly
in your calculations.
Labor is the welder’s hourly rate of pay including wages and benefits.
Overhead includes
allocated portions of plant operating and maintenance costs. Weld shops
in manu- facturing
plants normally have established labor and overhead rates for each department.
Labor and overhead rates can vary greatly
from plant to plant, and also with location. Figure 1
shows how labor and overhead may vary
and suggests an average value to use in your calcu- lations
when the actual value is unknown. 9.2.2
Deposition
Rate - The deposition rate is the rate that weld metal can
be deposited by
a given electrode or welding wire, expressed in pounds per hour. It is based
on continuous operation,
not allowing time for stops and starts caused by inserting a new electrode, cleaning
slag, termination of the weld or other
reasons. The deposition rate will increase as the welding
current is increased.
9.2.2.1 When
using solid or flux cored wires, deposition rate will increase as the electrical
stick-out is increased, and the same
amperage is maintained. True deposition rates for each
welding filler metal, whether it is
a coated electrode or a solid or flux cored wire, can only be
established by an actual test in which
the weldment is weighed before welding and then again after
welding, at the end of a measured period of time. The tables in Figures
8-11 contain average
values for the deposition rate of various types of welding filler metals.
These are based
on welding laboratory tests and published data. FIGURE
1 HOURLY WELDING LABOR
& OVERHEAD RATES Small
Shops $10.00 to
$25.00/hr. Large
Shops $25.00 to
$50.00/hr Average
$30.00/hr. APPROXIMATE
LABOR AND OVERHEAD RATES
