4.4 ISO 4063 Process Numbers & Consumable Standards

4.4 ISO 4063 Process Numbers & Consumable Standards

Quick Answer: ISO 4063 gives each welding process a number (111, 121, 135, 141…). Consumable standards such as ISO 2560 classify electrodes and wires. IWI-S verifies that the process number and consumable designation on the WPS match what is used on the joint, with correct storage, batch identity, and certificates.

Documents only work if everyone uses the same language. Process numbers and consumable classifications are that language. Confusing 135 with 136, or using the wrong hydrogen class electrode, is a documentation failure and a quality failure.

ISO 4063 — Why Numbers Matter

ISO 4063 defines a reference system of process numbers for welding and allied processes. On a WPS, WPQR, welder certificate, or drawing note you may see “Process 111” rather than a long English name. Inspectors must decode and verify, not memorise every obscure process, but the common production numbers are mandatory knowledge.

High-frequency process numbers for IWI-S

Exact sub-numbers can be more detailed in the full standard (e.g. laser variants in the 52x series). For exams and shop practice, read the number on the document and confirm the process in use matches. If the WPS says 141 and the booth is set up for 135, stop.

Related document links

• Welder/welding operator qualifications (e.g. ISO 9606 / ISO 14732 families) list processes by these numbers.
• Procedure qualification standards (e.g. ISO 15614 series) treat process as an essential variable.
• Transferring a welder from 111 to 135 is not automatic—range of qualification rules apply.

Consumable Standards Overview

Consumables are standardised so that a designation implies deposit properties and usability, independent of a single brand name.

Covered electrodes — ISO 2560 family

ISO 2560 covers classification of covered electrodes for non-alloy and fine-grain steels (other ISO standards cover stainless, Ni alloys, etc.). Designations encode information such as:

• Tensile/yield strength levels of undiluted weld metal
• Toughness temperature requirements where specified
• Coating type and recovery
• Welding positions
• Current type / polarity suitability
• Hydrogen designators for low-hydrogen performance

You will also meet AWS A5.x style marks (E7018, E6010) on mixed international sites. Map them through the WPS: the classification string on the carton and stub must match the WPS requirement, including any hydrogen or impact suffix the procedure needs.

Wires, rods, and fluxes

Solid wires, flux-cored wires, metal-cored wires, TIG rods, and SAW wire/flux combinations have their own specification families (ISO and/or AWS). Inspector-level expectations:

• Classification matches WPS (strength, chemistry, shielding gas compatibility).
• Diameter matches qualified size or allowed range.
• Flux–wire combination for SAW is often qualified as a pair—do not swap flux brands freely without engineering approval.
• Shielding gas composition (e.g. Ar + 18% CO₂ vs 100% CO₂) is part of the consumable system for gas-shielded processes.

Matching consumable to base metal and design intent

Selection is not “any steel wire for any steel.” Engineering chooses fillers for:

1. Strength overmatching or matching per design.
2. Chemistry (C, Mn, Si, Cr, Ni, Mo…) for corrosion, PWHT response, or cracking control.
3. Toughness at design minimum temperature.
4. Dissimilar joints — buttering layers, nickel-base fillers, etc., as specified.
5. Hydrogen control for hardenable steels and thick restrained joints.

The inspector does not redesign the filler; the inspector prevents substitution that is not approved by the WPS or a formal engineering change.

Storage, Handling, and Condition

Consumable condition is a process parameter in disguise.

Low-hydrogen electrodes

Basic low-hydrogen sticks absorb moisture from air. Wet coatings raise diffusible hydrogen → porosity and cold-cracking risk. Typical controls (follow manufacturer + WPS + code):

• Sealed packaging until issue.
• Baking (redrying) at specified temperature/time if allowed and required after exposure.
• Holding ovens at controlled temperature after baking.
• Issue periods (electrodes out of oven only for limited time).
• Quarantine of electrodes that exceeded exposure limits.

Inspectors check oven thermometers, issue logs, and that welders are not using open, rusty, or unmarked sticks from pockets or damp benches.

Wires and fluxes

• Spools protected from oil, dust, and condensation.
• SAW flux kept dry; recycled flux controlled.
• Copper coating damage or rust on wire can feed instability and inclusions.

Gas cylinders and hoses

• Correct gas identity (labels, mix certificates where required).
• No damaged hoses; adequate flow; drafts controlled for gas-shielded processes.

Batch Control and Traceability

Quality systems (aligned with ideas in ISO 3834 and client specs) typically require:

• Unique identification of consumable batches/lots/heats.
• Certificates (type 2.2, 3.1, etc. as ordered) filed and retrievable.
• Linkage from batch ID → joint/weld number → welder → WPS in production records.
• FIFO or controlled stock rotation to avoid expired or long-exposed product.

Inspector duties commonly include:

1. Verify carton/label designation equals WPS consumable.
2. Verify batch/lot number is recorded on weld data sheets or traveler.
3. Spot-check that certificate chemistry/strength meets purchase order and WPS.
4. Reject unidentified or mixed stubs in electrode quivers.
5. Raise NCR when wrong consumable was used—even if the bead “looks fine.”

Traceability is what allows recall if a bad lot is discovered later. Without batch records, the entire structure may need expanded NDT or cut-out.

Practical Workstation Verification Sequence

Before production welding:

1. WPS number and revision at the station.
2. ISO 4063 process on WPS = process set up.
3. Consumable classification + diameter + gas/flux = WPS.
4. Batch ID recorded.
5. Condition (dry electrodes, clean wire, correct oven practice).
6. Parameters (Chapter 4.3) within range.
7. Welder qualification covers process, material group, thickness, and position.

This sequence is a Standard-level habit that prevents most consumable-related NCRs.

Exam Traps

• Mixing 131 (MIG inert) with 135 (MAG active) on steel procedures.
• Treating 136 (gas-shielded FCAW) as identical to 114 (self-shielded) for wind and gas checks.
• Accepting E7018 stored open overnight as still low-hydrogen without procedure-backed recovery.
• Recording process name in prose but wrong ISO number on forms.
• Assuming brand names are enough without classification strings.

Closing Link to Inspection Competence

IWI-S is not a welding engineer, but IWI-S owns verification. ISO 4063 numbers tell you what process is authorised. Consumable standards tell you what filler system is authorised. Storage and batch rules tell you whether that system is still in a condition that can deliver the qualified properties. When any link fails, document it and stop work within your authority—beautiful beads made with wrong, wet, or untraceable consumables are still nonconforming.