Welding cost calculator

Four quantities and four prices, and the quantities come first. The deposited weld metal per metre divided by the deposition efficiency is the filler that has to be bought per metre; multiplied by the consumable price that is the consumable bucket. The same deposited mass divided by the deposition rate is the arc time per metre; divided again by the operating factor it is the paid welder time, and multiplied by the labour rate it is the labour bucket. Shielding gas is the flowmeter setting multiplied by the arc time, priced per cubic metre. Electricity is the arc power divided by the power source efficiency, multiplied by the arc time and by the price per kilowatt hour. Add the four and multiply by the joint length for the cost of a joint. This is the ordinary arc-welding cost relation from welding-economics teaching, not a proprietary model.

Because it divides the largest bucket. Welder time is arc time divided by the operating factor, so halving the factor doubles the labour charged against the same weld, while the consumable, gas and electricity buckets are untouched by it. A shop that improves fit-up, staging or handling changes its cost per metre without changing a single price it pays. Run the calculator twice with two operating factors and the same prices to see the size of that lever on your own joint; the split badge under the results tells you how much of the total is exposed to it.

Only the time the arc is actually burning on production welds. Positioning, fit-up, tacking, slag removal, wire and electrode changes, waiting for a crane, reading the drawing, breaks and inspection are all paid time with no arc, and every one of them belongs in the denominator rather than the numerator. The measurement is the same either way you take it: a shift stopwatch, or an arc-on counter in the power source or in a parameter recorder. What breaks the number is scope, not precision, because a factor measured over one long seam and a factor measured over a shift of short welds are two different quantities that share a name.

Enter the numbers and read the split rather than trusting a rule of thumb, because the answer depends entirely on your labour rate and your tariff. What is structurally true is that the electricity bucket scales with arc time exactly as the labour bucket does, so it never overtakes labour by getting bigger; it only looks larger when the labour rate is low or when the tariff is high. The calculator prices the energy the arc consumes over the arc time. It does not price the power the machine, the fume extraction and the cooler draw between arcs, which on a low duty cycle can be a comparable amount of energy for no weld at all.

Whichever one you can defend, and the same one every time you use this page. A bare wage answers the question of what the welding itself costs and is the right input for comparing two procedures on the same shop floor. A fully loaded rate, carrying employment costs, supervision, floor space, machine depreciation and consumable handling, answers the question of what the joint costs the business and is the right input for a quotation. The tool adds no overhead of its own, so whatever you type is exactly what the labour bucket contains, and a cost per metre quoted without saying which rate produced it is not comparable to anyone else.

More than this calculation returns, and the gap is worth measuring. The tool charges the flowmeter setting for the arc time alone, which is the gas that does the shielding. Real consumption also includes pre-flow and post-flow on every start and stop, the surge that a torch releases when the trigger is pulled after an idle period, back-purging on a root pass, gas lost to a leaking hose or a loose fitting, and the heel left in a cylinder when it is changed. On short welds with many starts the arc-time figure can be a small fraction of what the cylinder register shows. Comparing the calculated volume against cylinders actually consumed over a month is the cheapest audit in this list.

Edge preparation and cutting, tacking, fixtures, pre-heat and post-weld heat treatment, back-purge gas, inspection and non-destructive testing, rework and scrap, cylinder or bundle rental, machine depreciation, and every overhead that you do not fold into the labour rate yourself. It also leaves out the cost of getting the weld wrong, which for most fabricators is larger than everything on this page put together. The output is the cost of laying sound metal in a joint once, under the assumptions you typed, and it is deliberately a floor rather than a full works cost.

Yes, and that is the comparison it is best at, provided you change one thing at a time. Cost the same joint twice with the same prices and vary only the quantities that the procedure change actually moves: a different preparation changes the deposited metal per metre, a different process or wire changes the deposition rate and the deposition efficiency, mechanisation changes the operating factor. The difference between the two totals is the real subject, and it is far more robust than either absolute figure, because a labour rate that is wrong by the same amount in both runs cancels out of the difference and does not cancel out of the totals.