Pulsed vs continuous-wave cleaning

Two different ways of delivering energy.

A pulsed laser delivers short bursts of energy. A continuous-wave laser delivers output continuously while commanded on. Each can be used in suitable cleaning processes, but they must be compared on the real workpiece and required finish.

The CARTER cleaning range on these pages uses pulsed fibre lasers. A multifunction welding machine with a cleaning mode is a different proposition; its headline wattage is not a direct performance comparison.

Read more than the wattage.

The highest advertised pulse energy, frequency and average power are not necessarily available at the same setting. Use the operating envelope for the supplied machine.

When pulsed cleaning deserves a trial.

Selective coating removal, tooling maintenance, local preparation and work with tight surface limits are useful reasons to investigate pulsed cleaning. Short pulses can offer useful process control, but do not guarantee a cold or damage-free surface.

For thick coatings or large areas, compare the full cycle and total cost against continuous-wave cleaning and conventional methods. A higher-power alternative may suit some robust workpieces; only testing establishes the useful result.

Avoid a misleading power comparison.

Ask for the same sample, the same target finish and the same measured area. Record total job time, heat effects, extraction requirements, operator handling and any rework. A fast demonstration on easy surface rust is not proof of performance on your coating.

How scan patterns change the working area.

A scanning head moves the beam through a selected pattern. Line, area and ring patterns illustrate different ways to distribute energy. The exact modes available are confirmed for the supplied machine.

Scan-path diagrams explain the principle; they are not cleaning results or operating instructions.

Focus, optics and positioning.

The field lens affects the working distance and usable scan area. Moving the head away from the intended focus can change the energy density and cleaning result. Confirm the lens and its working distance with the supplied equipment.

A positioning frame can help an operator maintain a repeatable stand-off distance where the part geometry permits. Ask whether a suitable frame is included or available for the selected head; it does not replace laser guarding.

Scan speed, scan width, pulse frequency and the movement of the head work together. There is no universal setting for rust, paint, oil or different base materials. Use a validated recipe and the supplied operating instructions.

Beam profile matters too.

A flat-top beam profile aims to distribute intensity more evenly across its spot, while a Gaussian profile has a stronger centre and lower intensity towards the edges. The actual optical system and workpiece still determine the useful result.

Ask for the beam profile, lens, scan field and cleaning-head configuration to be identified in the quotation. A profile label alone does not guarantee uniform removal or freedom from surface damage.

Keep exploring.

Tell us what you need to clean.

Send the material, coating or contamination, approximate area, photographs and required finish. Carter will help narrow down the machine and the complete installation package.