Two pieces, 12 in. long, are welded together with 7014 electrodes. One piece, 3 in. wide and i in. thick, is fillet welded to the second piece. 6 in. wide and in. thick. The 3-in. piece is positioned on the center of the 6-in. piece and fillet welded on both sides to the top side of the 6-in.-wide piece. The welds are full length, or 12 in. The power supply has a 60 percent duty cycle and is rated at 200 A. The travel speed is 15 in./min, the operator fxtor is 0.80, the welding current is 150 A, and the welding voltage is 20 V. The density of the steel is 0.28 lb/in.' The operator rate is $18.00/hr and the machine rate is $24.OO/hr. The weld size is
a. What is the arc time to weld the two pieces together? (1.6 min)
b. What is the allowed time to weld the two pieces together? (2.0 min)
c. What is the energy per unit length? (12,000 J/in.)
d. What is the weight of metal deposited for the two convex fillet welds if the extra percentage of metal above the theoretical amount is 20 percent'? (0.252 lb) in.
e. What is the deposition rate during welding? (0.1575 lb/min)
f. What is the total weld shear area for design calculations? (4.24 in.')
g. What is the operator and machine cost for the weld ($1.40)