Welding, Fitup & Tack
Fitup is the assembly of all the components of a complete weldment to get it ready for welding. It does not include the welding time.
From a study in a Company that does a lot welding, a review of 14 independent variables was made:
# of components being welded
# of component edges being welded
Weight of total assembly (approximate)
# of Linear inches of Weld being layed down
# of tack welds
# of clamps
# of sub-weldments
# of cylinder shapes
# of bent pieces
# of restricted fits
# of semi restricted fits
# of flat shapes
# of 90 degree corners
# of round shapes
A regression analysis was performed to establish which of these variables had the highest mathematical correlation to fitup conditions. The results showed that the number of components, number of welded edges, weight of the weldment and linear inches of weld had the greatest impact on fitup time.
This study was performed by Neal P. Necastro, at Galion Manufacturing. His procedures conform to the American Welding Society Specifications for Earthmoving and Construction Equipment tailored to the needs of Galion Manufacturing.
This time added to welding time is the complete weldment manufacturing time excluding additional machining requirements, painting or assembly of purchased parts.
User Input
1. Enter "# of Components" to be welded together.
2. Enter "Total Weld Distance" for all of the components.
3. Enter "# Welded Edges" for all of the components.
These are the edges of parts that will be welded together.
4. Enter the "Weight of Assembly" which is the total weight for the entire assembly weldment.
The Final Time is the summation of these four inputs above for calculating the fitup time prior to welding.
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