Argon laser welding

It is always advisable to have marking tests performed in LASIT laboratories when you want to mark a plastic component. This is because the reactions to the laser vary depending on the different compounds, color pigments and other additives, which modifies the effect of the laser marking.

Expansion is a laser marking process that melts the surface of the plastic. The material, brought to the boiling point, melts. Subsequent cooling is very rapid. The gassed and vaporized bubbles are in the surface layer of the base material and create a whitish bulge. This causes a tangible (raised) marking effect. The effect of these bubbles is more visible if the base material is dark. In this case, the laser works at reduced power but with very long pulses. This process can be applied to all polymers, the composition of which will vary the final color: light or dark.

Carbonization makes it possible to create strong contrasts on glossy surfaces. During this process, the laser heats the surface of the material (to a minimum of 100 °C) causing the emission of oxygen, hydrogen or both. The result is a dark area with a high concentration of carbon. During carbonization, the laser operates at lower than average power. This results in a longer marking time than other processes. Carbonization can be applied to polymers or biopolymers such as organic materials (e.g. wood, skin and leather). Carbonization is mainly used for darkening and its contrast is not maximized on already dark components.

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Laser welding with material contribution

Other widely used 3D registration techniques are laser and structured light scanning. The former consists of projecting a laser line onto an object and moving it in one direction, while a camera records the deformation of that line reflected on the object as it moves [15]. A software interprets these deformations in the form of 3D coordinates and the three-dimensional image is generated.

three-dimensional image is generated. On the other hand, structured light scanning [16] uses a projector instead of a laser source and a light pattern with a binary sequence (e.g., black and white stripes) is projected onto the object and scrolled linearly. A camera captures the images of the stripe pattern, for each position on the object, and a suitable software processes the data and provides a 3D image of the object.

The RTI (Reflectance Transformation Imaging) technique [17], while not providing a 3D record in a strict sense, provides 2-D images with information on relief, cracking, fissures and textures. It is mainly used for the documentation of writings, paintings, friezes and reliefs. The technique consists of taking images of the object with a camera in a fixed position, and placing a light source in different positions for each shot. A reflective sphere, placed close to the object, and a software allow to calculate the direction in which the light is coming from in each recorded image. This information is processed by software and the result is an interactive image of the object, in which it can be viewed under different light directions and different effects can be created.

Laser beam welding (lbw)

Lasers are one of the most iconic scientific advances of the 20th century. These devices generate coherent photons concentrated into beams of a specific amount of energy. They can transmit data, detect molecules and burn metal. In addition, the photons also have significant power.  And that raises an interesting question: is it possible to transfer this force to generate beams of matter such as, for example, a flow of liquid? So far, no.

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But Bao and his collaborators realized that they could generate a stream of water within a larger volume of the liquid if it contained gold nanoparticles. They directed a green laser through the glass wall of the container and, after a few minutes, observed that a stream of liquid flowed rapidly along the direction of the light beam.

But ultrasound alone does not guarantee movement of the liquid, so something else must be going on. The researchers believe that the change from heating to cooling of the nanoparticles near the vessel wall causes them to bind to the glass. Over time, the nanoparticles become embedded around the point where the laser points at the liquid, and this creates a kind of nanocavity in the glass.

Laser welding history

Introducing the magic of laser engraving for jewelry to your business. The Welase personalization machine achieves the highest quality personalization in a matter of seconds and piques the curiosity of your customers.

Built-in sensors prevent the laser from operating unless the door is securely closed, with an instant cut-off in the event it is opened while the machine is running.

Specialized glass is used in the large display panels to ensure a safe, quality viewing experience that can be used as standard in any store in complete safety and without the need to build an enclosure or wear safety glasses.

Upgrade Welase with the Jewel package to support the jeweler’s daily creations. Thanks to the rotating device, put the finishing touch on your creations by customizing the inside and outside of rings and bracelets and quickly switch to curved bangles. Welase can also cut metal to create thin pendants.

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By Rachel Robison

Rachel Robison is a blogger who collects information on court filings and notices.