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Welding engineering calculators
The arithmetic a welding engineer repeats on every procedure: heat input, preheat, cooling time, carbon equivalent, dilution and deposition rate. Each one states the formula it uses and where that formula comes from, runs entirely in your browser, and exports the inputs and the results as a CSV you can attach to a procedure file.
None of them contains an acceptance limit copied out of a standard. Where a calculation needs a maximum, you type the one your specification imposes — that is a project decision, not a default.
Thermal control
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Heat input calculator
Arc energy and heat input in kJ/mm, kJ/cm and kJ/in with the EN 1011-1 thermal efficiency factors, checked against a WPS maximum.
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Heat input from a welding data log (CSV)
Paste or upload a time, current and voltage log and get arc energy and heat input per pass in kJ/mm and kJ/in, with every row checked against the window your WPS imposes. Parsed in your browser.
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Heat input unit converter
kJ/mm, kJ/cm, kJ/in and J/mm in one pass, with the EN 1011-1 thermal efficiency factor applied or removed, and travel speed in mm/min, cm/min, in/min and mm/s.
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Interpass temperature timer
A stopwatch and pass log for interpass control: the maximum your WPS imposes, each measured reading with the time it was taken, the interval since the last pass, and a CSV of the whole log.
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Preheat temperature calculator
Minimum preheat and interpass temperature from EN 1011-2 equation C.8, with CET and CEV calculated from the mill certificate.
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t8/5 cooling time calculator
Cooling time from 800 to 500 °C for two-dimensional and three-dimensional heat flow, with the transition thickness that decides which one governs.
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Welding distortion estimator
Transverse shrinkage, longitudinal shrinkage and angular distortion for butt and fillet welds from thickness, weld area, heat input and pass count, with every empirical coefficient exposed as an input.
Material and metallurgy
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Carbon equivalent calculator
CE(IIW), Pcm and CET from one mill-certificate composition, with your own specified maximum checked against whichever of the three the specification names.
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Weld dilution calculator
Dilution from measured macro-section areas or from penetration and reinforcement, with the resulting weld-metal content of any element.
Productivity
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Arc-on time and operating factor calculator
Arc minutes per joint, cycle time, joints per hour and the operating factor from joint length, travel speed, passes and the time the arc is off — plus the operating factor a target output would demand.
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Deposition rate calculator
Melting rate, deposition rate and kilograms per shift from wire diameter, feed speed, density, deposition efficiency and arc-on time.
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Fillet weld size calculator
Leg length to design throat and back with your own deep-penetration allowance, then the weld metal cross-section, volume and mass per metre and the consumable for the whole run.
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Shielding gas consumption calculator
Gas per joint and per shift from flow rate, arc-on time, pre-flow and post-flow, plus cylinder cost and how many joints one cylinder actually covers.
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Weld joint volume and consumables calculator
Cross-section area, weld metal volume and mass per metre for a single V, single bevel, double V or fillet, plus the filler quantity your own deposition efficiency implies.
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Weld map builder
Build a weld map line by line — weld numbers, joint, WPS, welder, NDT method, status — with the running counts per WPS and per welder, NDT coverage and duplicate weld numbers computed as you type.
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Welding cost calculator
Cost per metre of weld and per joint from deposition rate, deposition efficiency and operating factor, split into labour, consumable, shielding gas and electricity with your own prices.
Qualification and compliance
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ISO 15614 range of qualification calculator
Calculates parent-material, deposited weld-metal and outside-diameter bounds from the factors in your ISO 15614-1 edition, then checks one production joint without reproducing the standard tables.
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ISO 5817 self-assessment checker (Free Online Tool)
Check one measured weld-imperfection condition against a boundary copied from your current ISO 5817 edition, with scope prompts and metric or imperial units.
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ISO 9606-1 range of qualification checker
Walks a welder qualification test piece against a planned production joint variable by variable, computes the thickness and diameter range from the multipliers in your edition, and names the clause topic behind each essential variable.
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WPS essential variables checklist builder
Builds the list of variable categories a welding procedure specification has to document for one framework family, process and joint, tracks which are written and which are traced to the qualification record, and exports the filled checklist as CSV.
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WPS/PQR builder
Build a paired procedure record, calculate arc energy and heat input from test-coupon values, check user-entered draft ranges and track the evidence still open.
A calculator is a starting point, not a record
Every number on these pages is a prediction from values somebody typed. A welding procedure is judged on what the arc actually did, which is why the theory articles behind each tool spend more time on measurement than on arithmetic: the heat input guide, cooling rate and t8/5, and preheat and interpass monitoring to ISO 13916.
If the gap between the calculated value and the recorded one is what you are trying to close, that is what the welding monitoring system and parameter monitoring pages are about.
The calculators predict. The cell should record.
Therness builds the monitoring that turns a predicted heat input, preheat temperature or cooling curve into a measured record for every pass — thermal, visual and parametric, on the same timeline.
