4
The deposition efficiency is the percentage
of wire that is actually deposited in the weld. For the mig
process, this is approx. 95%. In the
case of shielded metal arc, the deposition efficiency is approx. 65%, as
much is wasted in the coating and stub
loss. Figures 9-1
through 9-3 give the required pounds (Kg) of weld metal per foot (m) of weld using
various joint designs.
The formula for shielding gas costs
is: Gas flow rate
cubic feet per hr (1/hr) x gas cost per cubic feet (1) Arc
travel speed in/min (cm/min) x
60 min-/hr 12
in./ft. (100 cm/m) Adding
the results of these 3 formulas will yield the welding cost per foot (meter) of
completed weldment.
