Plastic laser welding machine

Plastic Laser Welding Machine

Model :LK-GQF

Power options : 100W/ 200W/ 300W semiconductor Laser

Application Materials : such as ABS, PVC, PE, PP .......plastic, top welding material be transparent color plastic, bottom welding material be black color plastic

Product Advantages : No flash, burr or dust after welding; narrow heat-affected zone, smooth surface without secondary polishing

24 Month maintenance

Fast delivery

24 Hour treatment

Product Details

Description

Technician Specification

Packing List

Feature :
1. High weld strength nearly equal to base material, excellent airtight and watertight performance.
2. Simple hold-down fixture with low clamping pressure, thin-wall plastic parts free of deformation, fast model changeover.
3. Semiconductor laser plastic welding features high precision, smooth weld appearance, airtight sealing, no vibration damage, low operation cost and eco-friendly processing, widely used for shower heads, plastic valves and precision electronic plastic housings.

Working Principle of Semiconductor Laser Plastic Welding

This technology relies on two layers of plastic with different light transmittance. The upper transparent plastic transmits near-infrared laser light, while the lower light-absorbing plastic absorbs laser energy and converts it into heat. The contact surface of both plastics melts under heat, and molecular fusion occurs under the pressure of the hold-down fixture. After cooling, the two plastic parts are permanently bonded into one piece.

Basic Premise of Plastic Laser Welding: Two Layers of Plastics with Distinct Optical Properties Must Be Stacked and Clamped

Upper plastic layer (light-transmissive layer): It features high transmittance to wavelengths of semiconductor lasers (common options: 808nm / 915nm), allowing laser beams to pass through with nearly zero energy loss. This layer is usually natural transparent or light-colored plastic, such as PP, ABS and PC blended with transparent color masterbatch.

Lower plastic layer (light-absorptive layer): Laser absorbers (carbon black, special light-absorbing masterbatch) are added into this layer to fully absorb laser light energy, which is instantly converted into thermal energy.

The two workpieces must be tightly pressed together by a hold-down fixture with no gaps left between them — this is an essential prerequisite for successful welding.

II. Complete Physical Process (4 Steps)

Step 1: Laser penetrates the upper layer

A semiconductor laser emits near-infrared laser light that vertically irradiates the workpiece surface. The laser smoothly passes through the light-transmissive upper plastic and reaches the contact interface between the two plastic layers.

Step 2: Light energy converts into heat energy for localized melting

The light-absorptive plastic at the lower layer absorbs laser energy at the interface and instantly heats up to the plastic melting temperature. Heat transfers backward to the contact surface of the upper plastic via thermal conduction, melting the contact zones of both plastics simultaneously to form a molten pool.

Step 3: Interpenetration and fusion of polymer molecules

The fixture maintains continuous clamping pressure. Polymer chains of the two molten plastics diffuse and interweave with each other, achieving bonding at the molecular level.

Step 4: Cooling and solidification to form an integrated weld seam

After the laser stops emitting light, the molten pool cools down rapidly by natural heat dissipation. The melted area re-solidifies, firmly bonding the two plastic parts into a single piece and completing the welding process.

III. Explanation of Core Characteristic Principles

1.Only the interface melts while the outer surface remains intact

Laser energy is only converted into heat at the contact interface of the two layers. The outer surface of the plastic will not melt under high temperature, resulting in smooth finished parts free of burn marks and flash.

2.Vibration-free and adhesive-free bonding

Bonding is achieved through physical fusion by light and heat, eliminating the need for ultrasonic vibration or liquid adhesives. It avoids damage to internal precision components and produces no chemical volatile substances.

3.Only laminating pressure is required

Light compression force from the hold-down tooling is sufficient. Unlike hot plate welding that relies on high-temperature die pressing, thin-walled plastic parts are less prone to deformation.

plastic laser welding
Plastic welding material

Laser power	100W/ 200W/ 300W
Laser Type	Semiconductor laser
Focus mode	Manual /automatic
Axis	3 axis
Welding head	LK Laser
Cooling system	Air Cooling/ Water cooling
Welding speed	20m/min
Repeatability	+-0.03mm
Welding accuracy	+-0.05mm
Welding software	Caddsp
Welding control card	LK LASER
Machine packing size	130117182CM
Machine net weight	315kgs
Machine gross weight	338kgs

1 foot switch	1 USB disk
1 safety googles	1 Tookkits
Machine	Manual

Plastic Laser Welding Machine

Product Details

Description

Technician Specification

Packing List

Working Principle of Semiconductor Laser Plastic Welding

II. Complete Physical Process (4 Steps)

III. Explanation of Core Characteristic Principles

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