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ISO 15614 range of qualification calculator
ISO 15614-1 qualifies a welding procedure over a range of variables around a procedure test. This calculator handles the dimensional arithmetic for parent-material thickness, deposited weld-metal thickness and pipe or branch outside diameter, then checks the production values you enter against those calculated bounds.
It does not contain the standard's range tables. You supply the factors and absolute bounds from Clause 8 of the edition and qualification level named by the job. That keeps the source decision with the document you hold and leaves the browser to do only multiplication, floors, ceilings and range checks.
First confirm that Part 1 is in scope. Its published scope covers procedure tests for arc and gas welding of steels and arc welding of nickel and nickel alloys. Other processes and materials can route to another part of the series; the ISO 15614-1 scope page provides the decision flow before any number is entered.
The arithmetic, with the standard values left in the standard
lower bound = max( lower factor × test value , absolute lower bound )
upper bound = min( upper factor × test value , absolute upper ceiling )
Omit an absolute term when the applicable entry has none. Select “no upper bound” only when the clause you are using states that result. The same arithmetic is run separately for parent thickness, deposited thickness and outside diameter; all dimensional entries can toggle between millimetres and inches.
Worked arithmetic example — invented factors, not ISO values
Suppose a demonstration test value is 10 mm. Enter a lower factor of 0.80, an absolute lower bound of 5.50 mm, an upper factor of 1.40 and no absolute ceiling. The calculator returns max(0.80 × 10, 5.50) = 8.00 mm for the lower bound and 1.40 × 10 = 14.00 mm for the upper bound. A demonstration production value of 9 mm is inside that entered range, with 1.00 mm above the lower bound and 5.00 mm below the upper bound. Those four inputs are fictional so they cannot be copied into a WPQR; replace them with the applicable Clause 8 entry from your edition.
A result needs both sides of the range. The upper-mode selector distinguishes “not entered” from “the clause has no upper bound”, so a blank field cannot silently become an unlimited qualification. If only one bound is present, the production check is reported as incomplete.
How to calculate an ISO 15614-1 dimensional range
From one WPQR and the invoked edition to a documented production-joint check.
- Confirm the governing document. Check that the contract invokes ISO 15614-1, identify the edition and amendment, and record whether the WPQR was qualified at Level 1 or Level 2.
- Copy the test-piece values. Enter the parent-material thickness, deposited weld-metal thickness for the process being checked, and outside diameter where the test used pipe or a branch connection.
- Read the applicable Clause 8 entries. Select the row that fits the qualification level, material, weld and process. Type its factors, absolute floors and absolute ceilings into the matching fields; mark an upper bound unlimited only when the clause says so.
- Enter the production dimensions. Add the parent thickness, deposited thickness and outside diameter from the production joint. Leave an unknown value blank so it stays visibly unchecked.
- Finish the variable-by-variable review. Use the badges for the dimensional arithmetic, then work through Clauses 8.2 to 8.5 for every non-dimensional variable before releasing the WPS.
- Level is part of the basis. ISO 15614-1:2017 states that a Level 2 procedure test qualifies Level 1 requirements, but a Level 1 test does not qualify Level 2 requirements. The two selectors expose that direction before the dimensional result is read.
- Dimensions do not collapse into one range. Parent-material thickness, deposited weld-metal thickness and outside diameter each use the rule applicable to that variable and qualification case. A pass on one cannot fill an empty field on another.
- Material grouping remains a clause check. The applicable grouping and coverage sit in the parent-material part of Clause 8 and are not encoded here. Use the ISO/TR 15608 material-grouping scope page to confirm which grouping document the job invokes, then read the qualification coverage in ISO 15614-1.
- The WPS and WPQR answer different questions. The WPQR records the test and its qualified scope; the WPS gives production instructions inside that scope. The ISO 15609-1 scope page covers the content of that production document.
- Heat input still needs its own calculation and clause check. Use the heat input calculator for the recorded value, then apply the convention and qualified range required by the edition and job specification. This page does not infer it from thickness.
For the test, records and essential-variable workflow behind this calculation, read the ISO 15614-1 welding procedure qualification guide.
Questions engineers ask about this calculation
What does the ISO 15614-1 qualified range describe?
It describes where a welding procedure qualification record can support production without another procedure test, subject to every variable governed by Clause 8. Dimensions are only one part of that decision. The manufacturer conditions, parent material, common procedure variables and process-specific variables must all remain inside their applicable scope. This calculator handles three dimensional calculations and lists the remaining clause groups; it does not turn them into one automatic approval.
Why must I type the ISO 15614-1 factors into this calculator?
The factors and absolute bounds are edition-specific table content. Embedding them in a web page would copy that content and would leave a hidden stale rule when the contract invokes another edition or qualification level. You read the applicable row from the document you hold, type only the factors needed for your test piece, and the calculator performs the multiplication, floor, ceiling and production check.
Can one WPQR support several production thicknesses?
Yes, when each production thickness falls inside the qualified range derived from the test and every other Clause 8 variable remains covered. That is why a qualification record states a range rather than only the test-piece dimension. A production thickness inside the arithmetic here still needs its material grouping, process conditions, joint details and other essential variables checked against the same edition.
What must I check after all dimensional badges are green?
Read the rest of Clause 8 for the exact WPQR and production job: manufacturer control, parent-material grouping, joint and process details, welding consumables, thermal variables and every process-specific condition that applies. Also confirm the contract calls for ISO 15614-1 and the qualification level recorded. Green badges prove only that the numbers entered are inside the entered dimensional bounds.
A qualified range still needs production evidence.
WeldTrace records voltage, current and wire feed speed at 25 kHz, plus shielding-gas flow at 10 Hz, on each pass so production parameters can be reviewed alongside the WPS and WPQR.
