Through-Transmission Laser Welding of Polymers - TWI- transmission laser welding technology ,Process description. Through-transmission laser welding relies on the fact that many polymers, in their natural state, are not strong absorbers of NIR radiation. The window of NIR wavelengths that can be used, beyond the visible spectrum, from 800nm to approximately 2000nm, is illustrated in Fig.1. Fig.1. Transmission laser welding of similar and dissimilar ...in silicon and other technology-essential semiconductors. Concentrating on circumventing the optical limits on the deliverable energy density at interfaces between narrow-gap materials with intense infrared light, we make the first feasibility demonstration of transmission laser welding between silicon workpieces using nanosecond laser pulses.
The advantages mentioned above explain why laser welding has become an integral process in transmission manufacturing. However, it is not possible to easily integrate this method into a complete production line because the actual laser welding process is preceded and succeeded by many other processes.
As a rule, laser welding results in precise, visually perfect weld seams that can even be used as a design element. In addition, high weld strengths are attained, approximating the base material strengths. In quasi-simultaneous laser welding, the laser beam is led along the welding contour with the help of scanner mirrors with high traversing ...
LPKF Laser & Electronics AG, Osteriede 7, D-30827 Garbsen, Tel.: +49(0)5131 7095-1327; Fax.+49(0)5131 7095-90Search for more papers by this author Malte Borges , Corresponding Author
As a rule, laser welding results in precise, visually perfect weld seams that can even be used as a design element. In addition, high weld strengths are attained, approximating the base material strengths. In quasi-simultaneous laser welding, the laser beam is led along the welding contour with the help of scanner mirrors with high traversing ...
This technology is also known as laser transmission welding. In principle, it is possible to safely weld almost all thermoplastics as long as the two joining partners melt in the same temperature range. This is rarely a problem when the plastics are made of the same material.
Simultaneous Through-Transmission Infrared® (STTIr) laser welding is a process developed and patented by Branson. Waveguides direct and distribute laser energy simultaneously and homogeneously along the weld line. When two component plastic parts need to be joined, laser welding employs four basic steps to accomplish the task.
Laser Welding Advantages. Precise control of the laser beam offers users several benefits over TIG, MIG and spot-welding: Weld strength: The laser weld is narrow with an excellent depth-to-width ratio and higher strength. Heat affected zone: The heat affected zone is limited, and due to rapid cooling, the surrounding material is not annealed.
State-of-art review of laser irradiation strategies applied to laser transmission welding of polymers. Article. Full-text available. Dec 2020. OPT LASER TECHNOL. Bappa Acherjee. View. Show ...
NL-FW400 optical fiber transmission laser welding machine has the advantages of good beam quality and fine spot. The optical fiber transmission laser welder is a laser welding equipment that is collimated as parallel light through a collimating lens and then focused on the workpiece after the laser is transmitted through the optical fiber.
Welding of Automotive Components. The applications of laser in the manufacture of components cover engine parts, transmission parts, alternators, solenoids, fuel injectors, fuel filters, air conditioning equipment and air bags. An example of a laser welded solenoid is shown in Fig. 1. and gear component is shown in Fig. 2.
Laser transmission welding is a better alternative to the conventional welding processes applied for such applications. The gradual replacement of conventional welding processes, like ultrasonic, friction, vibration, resistance, and hot tool welding, by laser in the plastics industry, can be justified by process reproducibility, simplicity of ...
semi-crystalline polymers. laser welding of polymers. 1. Introduction. Laser Transmission Welding (LTW) is one of the smart manufacturing techniques of Industry 4.0. It is a versatile technique used to join polymeric components with varying thickness and configuration using a laser source.
Abstract: Laser transmission welding (LTW) is a new and efficient technology. During LTW of polymers, the size and morphology of the weld have great influence on the welding quality. In order to better evaluate the welding quality and optimize process parameters, many researches on the morphology and mathematical analytical model of the molten ...
Welding of Automotive Components. The applications of laser in the manufacture of components cover engine parts, transmission parts, alternators, solenoids, fuel injectors, fuel filters, air conditioning equipment and air bags. An example of a laser welded solenoid is shown in Fig. 1. and gear component is shown in Fig. 2.
Laser welding has a considerable depth of melt and high power density, which can weld refractory materials, such as titanium alloys, etc. 4) High energy density and suitable for high speed welding. 5) No wear and tear consumption of electrodes, tools, etc. 6) No pollution to the environment.
It is at this point in modern transmission manufacture that laser welding comes into its own, explains Dr. Andreas Mootz, managing director of EMAG Automation. "The process allows you to concentrate a carefully dosed amount of the energy emitted by the laser beam on the welding point, minimizing possible warping, while still achieving high ...
Abstract: Laser transmission welding (LTW) is a new and efficient technology. During LTW of polymers, the size and morphology of the weld have great influence on the welding quality. In order to better evaluate the welding quality and optimize process parameters, many researches on the morphology and mathematical analytical model of the molten ...
When plastics are joined by laser welding, the laser beam passes through the laser-transmissive upper part to transfer its energy to the lower, laser-absorbent part. Moderate clamping pressure ensures reliable heat conduction between the two joining partners. The weld seam plasticizes, and sets after cooling to form a secure, strong weld.
The resulting high energy density melts the workpiece and welds the components. The process is suitable for materials and components that are to be welded at high speed with a narrow weld seam and low thermal distortion. As a result, laser welding is used for high-precision applications in a wide range of industries, including the automotive ...
The mechanical performance (tensile strength at room temperature conditions) of nylon welded joints was evaluated in terms of the influence of transmission laser welding technology parameters (laser power, welding speed, laser beam spot sizes, clamp pressure, etc.) and thermoplastic composition (reinforcements, fillers, additives, pigments, etc.).
Through-transmission laser welding relies on the fact that many polymers, in their natural state, are not strong absorbers of NIR radiation. The window of NIR wavelengths that can be used, beyond the visible spectrum, from 800nm to approximately 2000nm, is illustrated in Fig.1. Fig.1. Absorption spectrum of a typical polymer
To manufacture it efficiently and at the highest precision calls for the two different parts to be produced separately and subsequently joined in a joining+welding process. It is at this point in modern transmission manufacture that laser welding comes into its own, explains Dr. Andreas Mootz, managing director of EMAG Automation.
In 1987, Nakamata [2] patented the. laser transmission welding technique, as a process in which, the laser beam penetrates the. upper transparent plastic part and is converted into heat by the ...
The popular methods for welding thermoplastic including induction welding, friction welding, ultrasonic welding, hot sheet welding, laser transmission welding and so on , , . Laser transmission welding (LTW) has broad application prospects owing to the distinctive advantages, such as small heat affected zone, high efficiency, high flexibility [7] .
