weld seam
A batch of 20 parts is to be welded in a heavy workshop. The parts consist of 3 metal tubes that are to be welded to a rectangular base (See attached figure). The diameter of each bead is 1300 mm and the operation will be done with a stroke speed of 400 mm/min. To weld this batch you know two technicians. The first one is a SMAW specialist, he works with a downtime of 1.2 minutes per piece worked, his labor is paid at $230/hour and replacing an electrode takes him 0.65 minutes per piece.
The second technician is an FCAW specialist and has told you that he already has an electrode (he will not charge for it), his labor is paid at $550/hour and he works with a dead time of 0.6 minutes per piece worked. Take into account that each electrode yields to weld 600 mm and that the cost of these is $0.70 each, also consider that, for both operations you will be working at 30 V and 225 A with a unit energy cost $0.1577/kWh and factors f1 and f2 of 0.8 and 0.9 respectively. Determine:
- The total cycle time for both types of welding.
- The arc time (productivity) for both welds.
- Cost of welding the batch for both processes
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