CWS (Other exams) key terms

The maximum airborne concentration of a hazardous substance, such as welding fume or manganese, that a worker may be exposed to over a set time period under workplace safety regulation.

A capture system placed close to the arc that pulls fume and smoke away before it reaches the welder's breathing zone, typically through a hood or extraction arm.

A welding gun with built-in vacuum ports near the nozzle that captures fume at the source and carries it through a hose to a filter unit.

A written authorization required before welding, cutting, or grinding in an area not designated for hot work, confirming fire hazards are controlled and fire watch is assigned.

A trained person stationed to monitor sparks and slag during and after hot work, with authority to stop the job and extinguish fires, remaining for the required post-work period.

A noncombustible barrier used to protect nearby workers from arc flash, ultraviolet radiation, and sparks, and to contain hot work hazards within a defined area.

The intense visible and ultraviolet light emitted by an open arc that can cause eye inflammation and skin burns, requiring shaded lenses and protective clothing.

A scale rating the darkness of a filter lens; higher numbers block more light and are selected based on welding process and amperage to protect the eyes.

A welding helmet with a filter that switches from light to dark almost instantly when the arc starts, protecting the eyes while allowing clear view when not welding.

Entering an enclosed area with limited access and poor ventilation, such as a tank or vessel, under a permit that controls atmospheric testing, rescue, and attendant requirements.

Connecting the workpiece and equipment to earth to prevent electric shock and stray current, and to provide a safe return path for welding current.

A written document that specifies the variables, such as process, current, voltage, and travel speed, required to produce a weld that meets the applicable code.

A record documenting the actual variables used and the test results from welding a coupon, proving that a proposed welding procedure produces sound welds.

A performance test in which a welder welds a test coupon that is inspected or mechanically tested to confirm the ability to produce acceptable welds to a code.

Examination of a completed or in-progress weld by eye, aided by good lighting and measuring tools, to detect surface defects such as undercut, porosity, and misalignment.

A groove melted into the base metal along the weld toe or root that is left unfilled, reducing thickness and creating a stress concentration that can lead to failure.

Cavities or holes in a weld caused by trapped gas that formed while the metal solidified, often from moisture, dirt, or insufficient shielding gas.

A gas or gas mixture supplied around the arc to protect the molten weld pool from atmospheric oxygen and nitrogen, preventing porosity and embrittlement.

Shaping the edges of parts, such as beveling, cleaning, and setting the root gap, before welding so the arc can penetrate and produce a sound joint.

Techniques such as balanced welding sequence, backstep, presetting, and restraint used to limit shrinkage and warping caused by uneven heating and cooling.

The planned order in which passes or segments of a weld are made, chosen to manage heat input and minimize distortion and residual stress.

The amount of energy delivered per unit length of weld, calculated from current, voltage, and travel speed, which influences cooling rate and mechanical properties.

The percentage of a ten-minute period a welding machine can operate at a given output without overheating; exceeding it can damage equipment and reduce productivity.

The weight of filler metal deposited per unit time, a key measure of welding productivity used to compare processes, parameters, and operator performance.

The rate at which the arc moves along the joint, affecting bead shape, penetration, heat input, and the total time required to finish the weld.

The portion of a shift during which the arc is actually burning, used to measure welding efficiency and identify lost time from fit-up, setup, and rework.

The percentage of welds or parts requiring repair or rework, a quality-cost indicator that drives scrap, labor, and schedule impact.

The total cost of internal and external failures, including rework, scrap, inspection, and warranty claims, used to justify quality improvement investment.

The proportion of material or parts discarded because they cannot be reworked to meet specification, directly increasing material and labor cost.

The total cost of filler metal, shielding gas, and related consumables divided by the length of weld produced, used to compare process economics.

The difference between the standard labor hours allowed for a job and the hours actually used, multiplied by the labor rate, highlighting productivity gaps.

A documented, repeatable method for a task that defines the sequence, timing, and quality checks so results are consistent across shifts and operators.

An ongoing effort to reduce waste and improve quality and throughput through small, measured changes involving the people who do the work.

A structured method for identifying the underlying reason a defect or failure occurred, rather than only treating the symptom, so recurrence is prevented.

A change made to eliminate the cause of a detected nonconformity, verified for effectiveness, so the same problem does not return.

Scheduled servicing and inspection of welding equipment and fixtures to prevent unplanned breakdowns that disrupt production and cause quality variation.

A short, focused safety briefing held at the start of a shift to review hazards, recent incidents, and the safe method for the day's tasks.

A method of breaking a job into steps, identifying hazards at each step, and defining controls before work begins.

A ranked approach to reducing risk, from most to least effective: elimination, substitution, engineering controls, administrative controls, and personal protective equipment.

An unplanned event that did not cause injury or damage but had the potential to do so, reported and investigated to prevent a future incident.

An approach that observes work practices, gives feedback on safe and at-risk behavior, and uses data to reinforce safe habits rather than punish individuals.

The shared values, attitudes, and behaviors of an organization toward safety, reflected in reporting, leadership commitment, and willingness to stop unsafe work.

The right and responsibility of any worker to halt a task when conditions are unsafe or unclear, without fear of reprisal.

Setting clear expectations, monitoring results, giving regular feedback, and addressing gaps through coaching or formal action to improve individual and team output.

A one-to-one conversation in which a supervisor helps a welder improve skill or judgment through observation, questions, and specific, timely feedback.

A chart showing which employees are qualified for which tasks or processes, used to plan training, assign work, and cover absences.

A structured approach to addressing disagreements between team members by clarifying interests, finding common ground, and agreeing on next steps.

A structured transfer of information between outgoing and incoming supervisors covering work status, open issues, safety concerns, and equipment condition.

Assigning a task and the authority to complete it to a team member while retaining accountability for the outcome, used to build capability and free supervisor time.

A measurable value, such as arc-on time, rework rate, or recordable injuries, used to track whether a team is meeting its operational and safety goals.