AWS Welder Performance Qualifier key terms

Documented evidence that a specific welder has produced acceptable test welds under controlled conditions, confirming the ability to deposit sound metal using a given process and position.

A written, qualified document listing the variables and ranges a welder must follow to produce a weld that meets the required mechanical and quality properties.

The record of actual welding variables and destructive test results obtained when a candidate welding procedure was tested to prove it can produce sound, code-compliant joints.

A welding parameter, such as process, filler classification, position, or base metal group, that if changed beyond permitted limits requires requalification of the procedure or the welder.

A welding parameter that may be changed within stated limits without invalidating a qualified procedure, provided the change does not adversely affect weld properties.

The assembly of base metal and deposited weld metal prepared by a welder or procedure under controlled conditions, from which specimens are cut for visual and mechanical testing.

The orientation of the test joint during welding, such as flat, horizontal, vertical, or overhead, which determines the positions a qualified welder may later work in.

The set of production welding positions a welder is permitted to use based on the most difficult position successfully tested during qualification.

The direction of welding travel, either upward or downward, on a vertical test joint; the direction tested limits the progression permitted in production work.

A qualification test performed on a joint with prepared edges rather than a simple overlapping lap, generally qualifying the welder for a broader range of production joint types.

A qualification test using a T-joint or lap joint to demonstrate the welder's ability to produce sound welds of specified leg size and profile without requiring full joint penetration.

Material, either permanent or removable, placed behind a joint root to support molten weld metal and help control penetration; its use affects qualification ranges.

The first weld bead deposited in a joint, which establishes penetration and fusion at the joint root and strongly influences the soundness of the completed weld.

A single continuous deposit of filler metal laid along a joint in one pass, forming the building block of a multi-pass weld.

A bead produced with a side-to-side oscillating motion of the electrode or torch, wider than a stringer bead and sometimes restricted by procedure limits.

A narrow bead deposited with minimal lateral oscillation, typically used for root passes and where heat input or bead width must be tightly controlled.

The energy delivered per unit length of weld, calculated from arc voltage, current, and travel speed; it influences cooling rate, toughness, and procedure qualification limits.

The application of heat to base metal before welding to slow cooling, reduce cracking risk, and drive off moisture from the joint area.

The temperature of the weldment measured immediately before depositing the next pass; it must stay within the maximum or minimum range set by the qualified procedure.

The standardized designation of a consumable by strength, composition, and usability, such as a shielded metal arc electrode classification, which is an essential variable in qualification.

A category of consumables treated as interchangeable for qualification purposes, allowing a welder qualified with one product to use others within the same grouping.

A classification that groups similar base metals, such as carbon steels or austenitic stainless steels, so qualification with one metal extends to others in the group.

The formal document listing the welder's identity, process, positions, thickness ranges, and test results, signed by the responsible party and retained as objective evidence.

The requirement that a welder requalify or have qualification renewed after a defined period without welding with the qualified process, or after a lapse in production work.

The verification that a written procedure matches its supporting qualification record and addresses every required variable for the intended production work.

The examination of test data and recorded variables to confirm that procedure qualification was performed correctly and supports the ranges claimed in the specification.

A destructive test in which a specimen is pulled to failure to measure strength and, for groove welds, to confirm that joint strength meets or exceeds base metal requirements.

A destructive test that bends a specimen over a specified radius to reveal surface and near-surface discontinuities and to assess ductility of the welded joint.

A destructive test in which a notched weld specimen is broken open to expose the fracture surface, revealing porosity, slag, and lack of fusion at the root.

The controlled cutting, machining, and finishing of test samples from a coupon so that test results reflect weld quality rather than preparation damage.

Inspection by eye, with or without magnification and aids, to detect surface discontinuities, profile defects, spatter, undercut, and incomplete fusion before other testing.

Checking the shape, size, and contour of a completed weld, including leg length, throat, crown height, and toe transition, against the specified acceptance criteria.

An imperfection open to or on the weld surface, such as a crack, undercut, overlap, or crater, which visual inspection is expected to find and evaluate.

A groove melted into the base metal at the weld toe or root that is left unfilled by weld metal, reducing thickness and acting as a stress concentrator.

A discontinuity where deposited weld metal fails to bond to the base metal or to a previous pass, often caused by insufficient heat, travel speed, or cleaning.

A condition where weld metal does not extend through the full joint thickness or to the root, leaving an unbonded gap that reduces joint strength.

The organized assignment of responsibilities for planning, executing, and verifying welding work so that qualified procedures, personnel, and equipment are used consistently.

A document defining the inspection and test activities, acceptance criteria, records, and responsibilities needed to demonstrate that welded work meets specified requirements.

A schedule showing the sequence of inspections and tests, who performs them, and which hold points require sign-off before work may proceed.

A designated stage in production where work must stop until a specified inspection or approval is completed and documented by the responsible authority.

A stage in production at which an inspector may observe the activity if notified, but which does not stop work if the inspector chooses not to attend.

A formal record describing a departure from specified requirements, its disposition, and the corrective action taken to prevent recurrence.

Steps taken to eliminate the cause of a detected nonconformity so that the problem does not recur, as distinct from simply repairing the affected item.

A technique such as radiography, ultrasonic testing, magnetic particle testing, or penetrant testing used to evaluate weld soundness without damaging the component.

Demonstration that an examination procedure and its personnel can reliably detect the specified discontinuities under the conditions of the actual inspection.

The stated limits defining which discontinuities are tolerable and which require repair or rejection, applied consistently during examination and review.

The proportion of a weld or joint actually inspected by a given method, which must meet the specified percentage and be documented in the examination report.