CWS (CWNP) key terms

A sudden release of heat and light energy caused by an electrical fault, capable of burning skin, igniting clothing, and damaging eyesight. Welders must wear flame-resistant PPE and keep electrode holders insulated.

The risk of current passing through a welder's body from an energized electrode, holder, or workpiece. Causes include wet conditions, damaged cable insulation, and missing grounding. Prevention relies on dry gloves, proper grounding, and open-circuit voltage limits.

Equipment or ventilation that removes welding smoke and metal fumes from the breathing zone. Local exhaust at the arc is most effective; general ventilation dilutes but does not capture fumes at the source.

A toxic form of chromium in fumes produced when welding stainless steel or chromium-bearing alloys. Exposure is linked to lung cancer and nasal damage, so local exhaust and air monitoring are required.

The use of respirators, such as half-mask or powered air-purifying units, to filter welding fumes. Selection follows exposure assessment, and fit testing plus medical clearance are required before use.

Wearable gear that protects welders from burns, radiation, and impact, including welding helmet, safety glasses, flame-resistant jacket, leather gloves, and safety boots. PPE is the last line of defense after engineering controls.

The darkness rating of a filter lens that protects eyes from arc radiation. The correct shade depends on process and current; too light a shade causes arc eye, too dark reduces visibility.

A written authorization required before welding, cutting, or grinding in areas where flammable materials may be present. It confirms fire watch, area clearance, and extinguisher availability before work begins.

A designated person who monitors the work area during and after hot work to detect and extinguish fires. The watch typically continues for at least 30 minutes after welding stops.

Entering an enclosed area with limited access and poor ventilation, such as a tank or pit. Welding inside requires atmospheric testing, a permit, an attendant, and rescue arrangements before entry.

Connecting the welding machine and workpiece to earth to provide a safe path for stray current. Proper grounding reduces shock risk and prevents current from traveling through unintended paths.

Any interruption in the normal structure of a weld, such as porosity, slag, or undercut. A discontinuity becomes a defect only when it exceeds acceptance criteria in the applicable code.

A discontinuity serious enough to cause rejection under a code or specification. Defects include cracks, incomplete fusion, and excessive porosity, and require repair or removal.

Inspection methods that reveal internal or surface flaws without damaging the weld, such as visual, liquid penetrant, magnetic particle, ultrasonic, and radiographic testing. Selection depends on material and defect type sought.

The first and most common examination of a weld, checking bead profile, undercut, spatter, and fit-up with the eye and simple gauges. It is inexpensive and must precede other testing.

A written document that lists the variables, such as current, voltage, travel speed, and filler metal, used to produce a weld meeting requirements. It guides welders and supports consistent, repeatable quality.

The documented test record proving that a weld procedure specification produces sound welds. It records variables and test results from welding a qualification coupon.

Testing a welder's skill on a coupon to certify competence for a specific process, position, and thickness. Passing demonstrates the ability to deposit sound welds to code.

The orientation of the weld relative to the welder, such as flat, horizontal, vertical, or overhead. Position affects difficulty, technique, and the qualification required.

A hand tool with templates used to measure weld features such as leg length, throat, undercut depth, and crown height. It supports quick field verification against acceptance criteria.

A measure of productive welding time compared with total paid time. Low efficiency often reflects excessive repositioning, waiting for parts, or rework, and supervisors target these losses first.

The percentage of a shift a welder spends with the arc actually lit. It is a key productivity indicator because setup, grinding, and handling reduce arc-on time without adding weld metal.

The percentage of a ten-minute period a welding machine can operate at rated output without overheating. Exceeding it causes thermal shutdown or reduced output.

The weight of filler metal deposited per unit of time, usually expressed in pounds per hour. Higher deposition rates shorten weld time but must stay within procedure limits.

The rate the arc moves along the joint, affecting bead size, penetration, and heat input. Too fast can cause undercut; too slow can cause excess buildup and distortion.

The energy delivered per unit length of weld, calculated from current, voltage, and travel speed. It influences cooling rate, hardness, and distortion, and is often limited by specification.

Unwanted change in shape or dimensions of a part caused by uneven heating and cooling during welding. Control methods include balanced sequences, fixturing, and minimizing heat input.

The proportion of welds or jobs requiring repair or rework. It is a direct cost driver, since rework consumes labor, consumables, and inspection time without adding value.

The spending on filler metal, shielding gas, and related supplies used in welding. Tracking consumption per unit of output exposes waste from spatter, stub loss, and over-welding.

The usable output obtained from purchased material, accounting for scrap, trim, and rejected parts. Improving yield lowers cost per finished unit without changing labor rates.

The agreed time required to complete a task under defined conditions by a qualified worker. It supports scheduling, quoting, and measuring performance against a fair benchmark.

A plan that assigns work, sequences jobs, and sets completion dates across available resources. Realistic schedules account for machine capacity, welder qualifications, and inspection lead time.

The operation with the least capacity that limits overall throughput of the line. Improving non-bottleneck stations adds little output; relieving the bottleneck raises total production.

The quantity of finished product a process delivers in a given period. It depends on the bottleneck, uptime, and rework, not simply on the fastest machine in the shop.

Assigning a task and the authority to complete it to a subordinate while retaining accountability. Effective delegation matches the task to skill and clarifies outcome, deadline, and resources.

A supervisory practice of guiding workers to improve skills through observation, questioning, and practice. It focuses on developing capability rather than merely correcting a single error.

Specific, timely information given to a worker about the quality or effect of their work. Good feedback describes observed behavior and its impact, and is paired with a clear next step.

A stepwise process for addressing repeated misconduct or poor performance, moving from verbal warning through written warning to stronger action. It documents efforts to correct behavior fairly.

A workplace approach that treats human error and system failures differently from reckless behavior. It encourages reporting of mistakes so causes can be fixed without automatic blame.

A structured check of work practices and conditions to identify unsafe acts and hazards before harm occurs. Observations should end with constructive conversation and follow-up action.

A short, focused safety briefing held at the start of a shift or job. It covers current hazards, required precautions, and lessons from recent incidents in a few minutes.

A method of breaking a job into steps, identifying hazards at each step, and defining controls before work starts. It forms the basis for training and procedure updates.