Welding economics
1.Arc welding economics
Welding processes in arc welding: SMAW,GTAW,GMAW,SAW,EGW,
EGW,Plasma are all employed for many industrial components.Welding costs estimation plays an important role in fabrication to calculate profit.Welding costs estimation for any specific process used in fabrication should understand components
of Total cost: cost of consumables(filler,fluxes,gases),labour costs,power cost,overheads.
SMAW
Weight of weld metal:
Volume of weldmetal*Density
Volume of weld metal:
Area as per edge preparation *length of weld
No of electrodes required:
Volume of weld metal per electrode:Electrode area*length of electrode consumed.
Number of electrodes required :
Volume of weld metal /electrode volume
Weld metal cost :
Cost per electrode*number of electrodes consumed.
Power cost:
Arc time per weld and units consumed (kwhr) and total unit cost
Labour cost.
Total hrs per weld*wages per hour
Other costs
Overheads
Miscellaneous costs
Sum of all costs gives welding cost estimation for length of weld
GTAW
Shielding gas cost :
flow rate (L/min)*arc time *cost/litre
Filler rod consumed :
area of cross section*length of rod consumed *density (kg)
cost/kg* amount of filler consumed during arc time : cost of filler
Total cost = cost of filler+ cost of shielding gas + power cost + labour cost + over head
Submerged arc welding
Total cost should include cost of filler,cost of flux,power cost,labour and overhead.