What is welding cost per part?

It is the total cost to weld one finished part, combining variable cost per part (wire, shielding gas, arc-time labor, and power) with fixed setup and fixture cost divided across the run. In the worked example, $3.20 variable plus $800/250 fixed equals $6.40 per part. It is the number you quote from, not just the wire and gas.

How do I calculate the fixed setup portion per part?

Add fixture amortization, welder setup time, and run-specific tooling into one Fixed Setup Cost, then divide by Parts in the run. With $800 of fixture and setup over 250 parts, the fixed portion is $800/250 = $3.20 per part. Run 1,000 parts instead and the same $800 falls to $0.80 per part, which is why batch size drives fabrication quotes.

What is a good welding cost per part benchmark?

There is no universal target; it depends on weld length and material. A useful check is the fixed-to-variable ratio. When fixed per part approaches variable cost, like the 50/50 split producing $6.40 here, your run is too short. Aim to keep fixed cost under 15-20% of the total by lengthening runs or reusing fixtures across similar parts.

Why is my welding cost per part higher than quoted?

Usually the variable rate was underestimated. Omitting shielding gas and filler wire can understate cost by 20-40% on wire-intensive parts. Check for overwelding: a 6mm fillet where 4mm was specified deposits roughly double the wire. Also confirm arc-time labor uses a burdened rate, and that fixed setup was spread over actual good parts, not the theoretical run size.

How do I convert weld length into wire cost per part?

Compute weld metal volume from fillet size and length, multiply by material density to get mass, then divide by deposition efficiency (about 0.90-0.98 for solid GMAW wire) and multiply by wire price per pound. Add gas: flow rate in cubic feet per hour times arc-time hours times gas cost. Both feed the Variable Cost per Part figure, $3.20 in the example.

Welding cost per part vs cost per pound of deposited metal, which should I use?

Cost per pound of deposit is good for comparing wire processes and estimating consumables, but it ignores fixture, setup, and short-run penalties. Cost per part rolls those in, so it is what you quote from. Use cost per pound to build the variable rate ($3.20 here), then add the fixed $3.20 per part to reach the $6.40 quoting number.

Cost and Quoting

Welding Cost per Part Formula

Welding cost per part combines per-piece variable welding cost with amortized fixture and setup cost. Use it when quoting weld assemblies, comparing wire processes, or building a cost model for a fabrication line.

Formula

Welding Cost per Part = Variable Cost per Part + (Fixed Setup Cost / Parts)

Variables

Variable Cost per Part: Filler wire, shielding gas, labor arc time, and power per completed part
Fixed Setup Cost: Fixture amortization, welder setup time, and tooling cost for the run
Parts: Number of parts in the production run or quote

Understanding the Welding Cost per Part Formula

This formula separates the two cost behaviors on a weld cell: costs that scale with every part and costs you pay once per run. The variable side captures filler wire, shielding gas, arc-time labor, and power consumed per completed part. The fixed side is fixture build, welder setup, and tooling spread across the batch. Splitting them tells you why a $6.40 part is expensive and which lever, wire usage or run length, actually moves the quote.

Pull variable cost from deposition data: weld length times deposition rate gives wire mass, priced per pound, plus gas flow times arc time and a burdened labor rate. In the example, that lands at $3.20 per part. Fixed cost is the $800 fixture and setup total divided by Parts. At 250 parts the fixed share is $3.20; at 1,000 parts it would drop to $0.80. Keep labor, wire, and gas in the same currency and per-part basis.

Interpret the split by ratio. When fixed per part rivals variable cost, as it does here at a 50/50 mix, the run is too short to absorb tooling; doubling quantity to 500 parts cuts total cost to $4.80. If variable dominates, attack wire and gas: switch to a metal-cored wire, trim overwelding, or optimize gas flow. A rising variable rate across identical jobs usually signals excess weld metal or spatter cleanup, not price.

Worked Example

Variable welding cost is $3.20 per part. Fixture and setup totals $800 for a run of 250 parts.

Fixed per part = $800 / 250 = $3.20
Total welding cost = $3.20 + $3.20 = $6.40 per part

Result: $6.40 per part

Common Mistake

Forgetting shielding gas and wire cost in the variable rate. These vary by wire type and weld length. Omitting them can understate welding cost by 20-40% on wire-intensive parts.

Frequently Asked Questions

What is welding cost per part?: It is the total cost to weld one finished part, combining variable cost per part (wire, shielding gas, arc-time labor, and power) with fixed setup and fixture cost divided across the run. In the worked example, $3.20 variable plus $800/250 fixed equals $6.40 per part. It is the number you quote from, not just the wire and gas.
How do I calculate the fixed setup portion per part?: Add fixture amortization, welder setup time, and run-specific tooling into one Fixed Setup Cost, then divide by Parts in the run. With $800 of fixture and setup over 250 parts, the fixed portion is $800/250 = $3.20 per part. Run 1,000 parts instead and the same $800 falls to $0.80 per part, which is why batch size drives fabrication quotes.
What is a good welding cost per part benchmark?: There is no universal target; it depends on weld length and material. A useful check is the fixed-to-variable ratio. When fixed per part approaches variable cost, like the 50/50 split producing $6.40 here, your run is too short. Aim to keep fixed cost under 15-20% of the total by lengthening runs or reusing fixtures across similar parts.
Why is my welding cost per part higher than quoted?: Usually the variable rate was underestimated. Omitting shielding gas and filler wire can understate cost by 20-40% on wire-intensive parts. Check for overwelding: a 6mm fillet where 4mm was specified deposits roughly double the wire. Also confirm arc-time labor uses a burdened rate, and that fixed setup was spread over actual good parts, not the theoretical run size.
How do I convert weld length into wire cost per part?: Compute weld metal volume from fillet size and length, multiply by material density to get mass, then divide by deposition efficiency (about 0.90-0.98 for solid GMAW wire) and multiply by wire price per pound. Add gas: flow rate in cubic feet per hour times arc-time hours times gas cost. Both feed the Variable Cost per Part figure, $3.20 in the example.
Welding cost per part vs cost per pound of deposited metal, which should I use?: Cost per pound of deposit is good for comparing wire processes and estimating consumables, but it ignores fixture, setup, and short-run penalties. Cost per part rolls those in, so it is what you quote from. Use cost per pound to build the variable rate ($3.20 here), then add the fixed $3.20 per part to reach the $6.40 quoting number.