HanWei Semiconductor Laser Welding Machine Compact Long Life AND QCW PWM CW Modes

The HW-D is a semiconductor laser welding machine built for continuous industrial production. Instead of the bulky resonator stacks of conventional laser welders, it uses a compact diode module architecture that delivers a stable output from a footprint. Its direct diode pumping path converts electrical power into laser light with an electro-optical conversion efficiency, roughly three times that of lamp-pumped systems, so less energy is wasted as heat and no wearing parts are consumed during operation.

The laser head, power supply and chiller are integrated into a single skid-mounted frame, so the whole system can be moved by forklift and put into production on a standard shop floor line. The diode module is sealed, and the water-cooled optical path keeps junction temperature stable, which removes the drift and re-alignment work that shortens the life of older YAG welders.

The result is a lower wall-plug power draw, a smaller chiller load and a welding cost per metre that stays flat over years of use. Because the light is generated by diode stacks and delivered through a passive fiber, there are no flash lamps, no dye cells, no electrodes and no consumable optics to replace on a schedule — maintenance is limited to water and filter changes.

The beam is homogenised before it enters the delivery fiber, producing a flat-top energy profile instead of a hot centre spot. Every point of the weld pool therefore receives the same energy density, which suppresses spatter, avoids undercut at the seam edge and gives a consistent penetration depth and bead width from the first part to the ten-thousandth part. This is especially valuable for seam welding of thin stainless steel and for heat-sensitive battery and electronic parts.

One machine covers three welding strategies: CW for continuous deep penetration welding, QCW for high peak power spot and seam welding with low average heat input, and PWM for fine energy dosing on thin or dissimilar metals. Each mode ships with its own programmable ramp-up and ramp-down (soft start and soft fade) function, so the pulse rises and falls in a controlled curve. That eliminates the start-point crater and end-point pinhole that cause leak paths and weld cracking, and lets operators match the heat curve to the material without extra hardware.

• Seam and spot welding of plastics, tin, sheet metal, etc.
• Battery tab, busbar and connector welding for power packs
• Sensor, relay and micro-motor housings in electronics assembly
• Mould repair, tool and die build-up, and precision instrument welding
• Hardware, kitchenware and architectural metal fabrication

A compact body means the machine fits beside an existing production cell instead of needing a dedicated room. High electro-optical conversion keeps running cost and cooling load low. Uniform beam energy means fewer rejects at the seam. And the dedicated QCW, PWM and CW modes with built-in ramp-up and ramp-down coverage mean one unit handles both delicate thin-gauge work and deeper structural welds.