Welding & fabrication
Welding Time & Labor Cost Calculator
Estimate arc minutes, elapsed shop time, direct labor, shielding gas, and consumables. Every cost assumption stays editable so the output can reflect your crew and process.
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Digital welding stopwatch
Track true arc time and non-arc time on a few representative jobs before setting an operator factor.
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Welding fillet gauge set
A verified weld size is more useful for estimating filler and rework than a visual guess.
Why arc time is not the same as job time
Travel speed tells you how quickly the arc moves along the joint. It does not include bringing material to the bench, preparing the joint, fitting and tacking, changing position, replacing electrodes or wire, cleaning between passes, inspecting, or moving the finished part. A quote based only on bead length can therefore miss most of the labor on a small or awkward job.
TWI calls the percentage of working time spent depositing weld metal the duty cycle or operator factor. This is different from the electrical duty-cycle rating printed on a power source. Here, an arc-on value of 30% means every 18 arc minutes represents about one elapsed production hour before separate setup and final cleanup are added.
The calculation chain
Total pass length = physical joint length × number of passes
Arc minutes = total pass length ÷ travel speed
Production minutes = arc minutes ÷ arc-on percentage
Total elapsed minutes = setup + production + cleanup
Labor cost = total elapsed hours × crew size × loaded hourly rate
Shielding gas is based on arc time, not all elapsed time: gas used = flow rate in CFH × arc hours. Other consumables use the same arc-hours base. The result is divided by physical joint feet—not pass-feet—so extra passes correctly increase cost per finished foot of joint.
Worked example: 10 feet, two passes
The default example uses a 120-inch joint, two passes, 10-ipm travel, 30% arc-on time, 20 minutes of setup, 10 minutes of cleanup, one person at a $45 loaded hourly rate, 25 CFH gas at $0.60/ft³, and $8 per arc-hour of other consumables.
- 120 in × 2 passes = 240 inches of pass length.
- 240 ÷ 10 ipm = 24 arc minutes.
- 24 ÷ 30% = 80 production minutes.
- 20 setup + 80 production + 10 cleanup = 110 elapsed minutes.
- 1.833 person-hours × $45 = $82.50 labor.
- 25 CFH × 0.4 arc hours = 10 ft³ × $0.60 = $6.00 gas.
- 0.4 arc hours × $8 = $3.20 other consumables.
- Total direct cost = $91.70, or $9.17 per physical joint foot.
Choose an operator factor from evidence
| Manual process | TWI example range | Typical lost time |
|---|---|---|
| SMAW / stick | 15–30% | Electrode changes, slag removal, restarts |
| GTAW / TIG | 25–40% | Fit-up, filler handling, cleaning, repositioning |
| GMAW / MIG | 30–45% | Fit-up, handling, nozzle service, cleaning |
| FCAW | 25–45% | Slag, wire handling, interpass cleaning |
These are reference ranges, not defaults that fit every shop. Time three to five representative jobs and calculate actual arc minutes divided by elapsed production minutes. Separate setup that changes by batch size. A fixture may take 40 minutes to set once and then serve 20 parts; charging all 40 minutes to each part would overstate a production quote, while omitting it from a one-off job would understate the cost.
Build a loaded labor rate carefully
A wage is not necessarily the employer's direct hourly cost. A loaded rate can include payroll taxes, workers compensation, benefits, paid leave, and other direct employment costs. Shop rent, depreciation, administration, sales effort, insurance, electricity, profit, and tax are generally better handled as separate overhead or markup decisions. Keeping them separate makes the estimate auditable.
What the result deliberately excludes
- Base metal and preparation: plate, tube, cutting, beveling, machining, and cleaning.
- Exact filler quantity: use the rod and wire calculator for joint-volume math.
- Equipment cost: power source, feeder, torch, fume extraction, fixtures, maintenance, and depreciation.
- Quality risk: procedure development, preheat, interpass controls, inspection, testing, repair, and rework.
- Commercial additions: overhead, travel, contingency, tax, and profit.
A direct-cost baseline is still useful. It shows whether labor, gas, or arc time is driving the job and lets you test a change without hiding assumptions inside one price-per-foot guess. It should be one input to a quote, not the quote itself.
Sources and methodology
- TWI: Welding Costs — operator-factor concept, reference process ranges, and the importance of non-arc activity.
- TWI: typical duty cycles in arc welding — definition and typical workshop values.
- TWI: Welding Costs, continued — relationship among deposited weld metal, time, and process productivity.
Sources and calculator behavior were reviewed on . All rates and times are user-entered. The pure calculation module is unit-tested against hand calculations, including multi-person labor and gas-free stick-welding scenarios.
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