Stick Electrode Consumption and Stub Loss Calculator
Stick electrode purchasing is usually done by feel, which means either running short mid-job or carrying dead stock. This calculator estimates how many electrodes and how many kilograms a job needs, accounting for stub loss, coating, spatter and waste.
Your numbers
Weigh a new electrode including coating. Many 4.0 x 350 mm basic types are in the 60 to 70 g range.
Weld metal deposited divided by weight of electrode consumed, including coating and spatter loss.
Your results
Yield varies with electrode type, current and technique. Weigh and count electrodes on a real trial pass to calibrate the yield figure.
Electrodes needed vs stub length
Sweeps Stub length discarded from 20 to 100, holding your other inputs fixed.
Consumables issue and return tracking
Share how electrodes and wire are issued and we will outline a work-order based tracking approach.
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How to use it
Enter the weld metal required, typically from a weld volume estimate. Pick electrode length, weigh one electrode and enter the weight, then set the stub length your welders discard. Set the yield, which is the share of the consumed electrode weight that ends up as weld metal, and a waste allowance for damaged or moisture-affected rods. You get the count, the kilograms to purchase and the cost. The chart shows how strongly stub discipline moves the quantity.
The calculation
Usable length is the full length minus the stub. Weld metal per electrode equals the electrode weight, times the usable fraction, times the yield. The count is the weld metal weight divided by that figure, increased by the waste allowance and rounded up. Kilograms to buy is the count times the full electrode weight, since the stubs are paid for even though they are not burned.
Controlling consumption
Stub loss is the cheapest saving. Cutting stubs from 75 mm to 40 mm on a 350 mm rod recovers roughly one tenth of the usable length. Low-hydrogen electrodes must be stored and re-dried per the manufacturer's instructions, since moisture causes rejects and the waste you see in the allowance. Hand out electrodes in small quantities from a controlled oven, and require stubs to be returned for counting.
- Weigh a sample of rods to confirm weight
- Time a trial pass to calibrate yield
- Return stubs to measure real loss
Common mistakes
Mixing weld metal weight with electrode weight is the biggest error: you must buy more electrode than the metal you intend to deposit. Another is using the deposition efficiency of wire processes for coated electrodes, where coating and slag take a large share of the weight. Remember that yield definitions differ between suppliers, so confirm what a quoted figure refers to.
Frequently Asked Questions
How many electrodes per kg of weld metal?
It depends on rod size and yield. With about 65 g rods, 50 mm stubs and 62 percent yield, each electrode deposits about 35 g, so around 28 electrodes per kg of weld metal. Weigh your own rods to confirm.
What is a reasonable stub length?
Many shops aim for 40 to 50 mm on 350 mm rods. Shorter stubs save material but overheat the coating and raise defect risk, so follow the manufacturer's guidance and your procedure.
Why is yield much lower than wire deposition efficiency?
Because the coating is part of the electrode weight but not part of the weld metal. Coating becomes slag and gas, so a large fraction of the consumed electrode weight does not end up in the joint.
Do wet electrodes affect quantity?
Yes. Moisture pickup in low-hydrogen types leads to porosity and cracking risk and forces rework or rod rejection. Store and bake them per the supplier instructions and keep the waste allowance honest.
If consumables are issued on paper tickets, Netray can help build issue and return tracking against work orders in your ERP.
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