How do you calculate frame weld yield?

Divide accepted frames by inspected frames and multiply by 100. With 468 accepted of 500 inspected, weld yield is 93.6 percent.

What does the weld yield gap to target mean?

It is your actual yield minus the target. At 93.6 percent against a 96 percent target the gap is -2.4 points, meaning you are running 2.4 points below where you want to be.

What is a good first-pass weld yield for bike frames?

Mature aluminum frame lines often target 95 to 98 percent first-pass yield. The 93.6 percent in this example falls short of a 96 percent target, which signals a process worth investigating rather than a one-off.

Does this count reworked frames as passes?

No, this is first-pass yield, so a frame that needed weld rework to pass should be a fail here. Counting rework as a pass hides the very drift the metric is meant to catch.

How many frames were lost in this example?

500 inspected minus 468 accepted is 32 rejected frames, or 6.4 percent. On a safety-critical joint, those 32 are worth a defect-type breakdown to find the dominant failure mode.

Why track yield gap instead of just yield?

The gap puts your number in context against the target you committed to. A bare 93.6 percent looks fine in isolation, but the -2.4-point gap makes clear you are below plan and quantifies how much improvement is needed.

Bicycles, E-Bikes & Micromobility calculator

Frame Weld Yield Calculator

Frame Weld Yield measures the share of welded bicycle or e-bike frames that pass inspection on the first pass, then compares it to your target. Welding engineers and quality leads on aluminum and steel frame lines watch it because frame welds are safety-critical joints at the head tube, bottom bracket, and dropouts, and rework on a finished frame is expensive and can leave residual stress. Tracking first-pass weld yield against a target turns scattered reject tickets into a clear signal of whether a fixture, weld program, or operator is drifting before it shows up as warranty cracks in the field.

What this calculator does

Calculate accepted bicycle, e-bike, or scooter frame welds against inspected frame weldments, with a target yield for fabrication quality review.
a bicycle, e-bike, or scooter frame line needs to compare passed welded frames with total inspected weldments for a model, shift, or lot
It divides accepted welded frames by inspected frame weldments and multiplies by 100 to give first-pass weld yield, then subtracts your target to show the gap.

Formula used

Frame weld yield = accepted welded frames ÷ inspected frame weldments × 100
Weld yield gap to target = frame weld yield - target weld first-pass yield

Inputs explained

Frames passing weld inspection:
Total frame weldments inspected:
Target weld first-pass yield:

How to use the result

Use it for daily or per-batch line monitoring, after a fixture or weld-program change, or when qualifying a new frame model or welder.
It counts pass or fail at inspection and says nothing about why frames failed, so pair it with defect-type tracking to find whether porosity, burn-through, or fit-up is driving the loss.

Current U.S. benchmarks

Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate frame weld yield? Divide accepted frames by inspected frames and multiply by 100. With 468 accepted of 500 inspected, weld yield is 93.6 percent.
What does the weld yield gap to target mean? It is your actual yield minus the target. At 93.6 percent against a 96 percent target the gap is -2.4 points, meaning you are running 2.4 points below where you want to be.
What is a good first-pass weld yield for bike frames? Mature aluminum frame lines often target 95 to 98 percent first-pass yield. The 93.6 percent in this example falls short of a 96 percent target, which signals a process worth investigating rather than a one-off.
Does this count reworked frames as passes? No, this is first-pass yield, so a frame that needed weld rework to pass should be a fail here. Counting rework as a pass hides the very drift the metric is meant to catch.
How many frames were lost in this example? 500 inspected minus 468 accepted is 32 rejected frames, or 6.4 percent. On a safety-critical joint, those 32 are worth a defect-type breakdown to find the dominant failure mode.

Last reviewed 2026-05-12.