Aluminum and aluminum alloys are widely used in industries such as automotive manufacturing, consumer electronics, aerospace, and new energy systems due to their lightweight properties, high strength, and excellent corrosion resistance. However, one critical issue in the welding process cannot be overlooked: the presence of an aluminum oxide (Al₂O₃) layer. When exposed to air, aluminum reacts with oxygen almost instantly, forming a dense oxide layer on its surface within nanoseconds to milliseconds. Although this oxide layer is extremely thin, typically ranging from nanometers to micrometers, it has a melting point of approximately 2050°C, which is significantly higher than the melting point of aluminum at around 660°C. This difference creates major challenges during welding. If the oxide layer is not properly removed before welding, several problems can occur. First, aluminum oxide does not melt along with the base metal, which prevents proper fusion in the weld pool and leads to poor bonding. Second, the oxide layer tends to absorb moisture, oil, and other contaminants. These substances decompose at high temperatures and generate gases, resulting in porosity in the weld. In addition, the high electrical resistance of the oxide layer can affect arc stability, making the welding process less consistent and potentially causing insufficient penetration and reduced weld strength. Currently, there are three main methods used in industry to remove aluminum oxide: mechanical cleaning, chemical cleaning, and laser cleaning. Mechanical cleaning is the most traditional approach. It typically involves the use of stainless steel wire brushes, sandpaper, grinding wheels, or abrasive blasting. These methods remove the oxide layer through physical friction. Mechanical cleaning is cost-effective, simple to operate, and suitable for on-site work or small-scale production. However, it has several limitations. It can damage the base material, the cleaning quality depends heavily on operator skill, and the surface finish is often inconsistent. In addition, it generates dust and debris, making it less suitable for high-precision welding applications. Chemical cleaning removes the oxide layer through chemical reactions. Common processes include solvent cleaning to remove grease, alkaline cleaning to eliminate light oxidation, and acid pickling to dissolve thicker oxide layers. This method provides more uniform results and is particularly effective for complex geometries and batch processing. It can also remove oil and oxide simultaneously. However, chemical cleaning raises environmental concerns, requires proper waste disposal, and carries the risk of over-etching or corrosion. The process is also more complex, typically involving rinsing, neutralization, and drying steps. Laser cleaning is an advanced, non-contact surface treatment technology. It uses a high-energy laser beam to interact with the material surface. Because aluminum oxide absorbs laser energy more eff...

Laser welding can be performed with or without filler wire. However, using filler wire often makes the welding process more flexible and easier to control. A wire feeder can be used together with a laser welding machine to weld various metal parts, including precision components. In laser wire welding, setup is critical. The filler wire must be carefully aligned with the laser beam. The wire feeding angle, position, and wire size must all meet the welding requirements. Only with proper setup and operation can you ensure uniform melting, stable weld seams, and clean welding results. 1. What is a Wire Feeder for Laser Welding? A laser welding wire feeder is a key device used to improve welding quality. It feeds filler wire into the weld seam. Typically, the wire feeder delivers the wire smoothly into the welding area to fill gaps and form a strong joint. The laser then melts the filler wire, allowing it to fuse with the base metals. Using a high-quality wire feeder can significantly improve welding quality and increase welding speed. It usually includes a motor, rollers, and a speed controller. All parameters can be precisely adjusted according to different wire types and materials, making the welding process easier and more stable. 2. How Does a Wire Feeder Work? The working principle of a wire feeder is similar to a controlled wire dispensing system. Inside the machine, motor-driven rollers grip the wire spool. As the rollers rotate, they pull the wire from the spool and push it into a conduit, which guides the wire to the laser welding head. Precise speed control is the key factor. The wire feeding speed must match the laser power and welding speed. When exposed to the high-energy laser beam, the filler wire melts instantly. The molten wire fills the joint gap, ensuring a strong, uniform, and defect-free weld. 3. Why Use a Wire Feeder in Laser Welding? Although laser welding can be done without filler material, using a wire feeder offers several advantages: (1) Filler Material Addition The wire feeder adds filler material into the weld seam, helping to fill gaps between materials. This improves weld quality and joint strength, especially when the gap between workpieces is large. (2) Safer for Precision Components Using filler wire reduces the total heat input during processing. This is safer for delicate and heat-sensitive materials, helping to maintain the integrity of the base material. Lower heat input also reduces the risk of distortion or warping, especially for thin parts. (3) Better Control of Weld Depth Filler material helps control the depth and shape of the molten pool. With precise wire feeding, you can control weld size and penetration, preventing issues such as undercut or insufficient material. (4) Improved Production Efficiency Wire feeding increases material deposition rates, allowing more material to be welded in less time. This is particularly beneficial in mass production, such as automotive manufacturing, where efficiency is ...

During operation, key areas of ships—such as the hull, deck, and inner cabin walls—are highly susceptible to corrosion caused by seawater exposure. Traditional manual grinding for rust removal is inefficient (only 20–30 m² per person per day) and often fails to remove rust completely, leading to poor coating adhesion and premature peeling. High-pressure water jet cleaning, on the other hand, requires large amounts of fresh water and may potentially damage the metal structure of the vessel. PES LASER provides an efficient and environmentally friendly rust removal solution for the shipbuilding industry. For external ship hull surfaces, laser cleaning equipment combined with a lifting working platform can be used. With laser power ranging from 50W to 6000W, the system effectively removes rust layers of 30–50 μm thickness and can penetrate deep into oxidized gaps on the hull surface. After cleaning, the surface roughness reaches Sa2.5, fully meeting the requirements for subsequent coating processes. For confined spaces inside ship cabins, portable handheld laser cleaning machines offer flexible operation. Equipped with anti-slip handles and protective goggles, operators can safely and efficiently clean common marine-grade steel such as AH36 and DH36 without causing any damage. The process requires no water, eliminating wastewater discharge and preventing marine pollution. In addition, the system supports battery-powered operation, allowing 4–6 hours of continuous use on a single charge. This significantly reduces dry dock maintenance time, minimizes vessel downtime, and lowers labor costs for rust removal by 30%–40%.

The mechanical hardware industry often faces several challenges, including low efficiency in batch rust removal for small and medium-sized hardware parts such as bolts and nuts, difficulty in cleaning heavy oxidation layers on large mechanical components like machine tool beds and gearbox housings, and the risk of corrosion and dimensional accuracy loss caused by traditional acid pickling processes. To address these issues, PES LASER offers customized laser rust removal solutions for different application scenarios. For batch processing of small and medium-sized components, PES LASER provides automated conveyor-type laser cleaning workstations equipped with automatic loading and unloading systems. A single system can process 500–800 workpieces per hour, with rust removal depth precisely controlled within 5–50 μm. The system effectively removes rust, oil contamination, and oxide layers while forming a passive protective layer on the surface after cleaning, improving corrosion resistance by approximately 30%. For large mechanical components and diverse on-site applications, PES LASER has developed portable suitcase-style laser cleaning machines. These lightweight and mobile systems allow operators to manually clean complex areas such as weld seams and grooves. With laser power options ranging from 50W to 6000W, the equipment is suitable for various materials including carbon steel, stainless steel, and aluminum alloys. The cleaned surface remains damage-free, with dimensional accuracy controlled within ±0.02 mm, enabling direct assembly without additional post-processing. This helps enterprises reduce component scrap rates by 15%–20% and significantly lower overall production costs.

Laser cleaning machines have gained widespread acceptance and application across various industries. Their applications range from rust removal and paint removal to surface treatment. Consequently, handheld laser cleaning machines are extremely popular. As our world evolves, the demand for efficient and effective cleaning is also growing. To address this challenge, demand for robotic laser cleaning machines is also increasing. They are significantly contributing to the evolution of industrial cleaning methods. Manufacturers are continuously improving their design and efficiency to meet customer needs. They can be used for a variety of industrial cleaning applications. Overview of Collaborative Robots for Industrial Applications Collaborative robots, also known as cobots, are one of the latest technologies in the industrial sector. Cobots can complete tasks faster and more efficiently. Because they are fully controllable, you can use these devices for a variety of tasks. In addition to laser cleaning, they can also be used for welding, assembly, and inspection. These robots are easy to program and can switch between different tasks with the same precision. Furthermore, collaborative robots are smaller and safer than traditional technologies. Most automated manufacturing utilizes collaborative robots to achieve faster and more accurate work. They are particularly popular in the electronics, automotive, medical, and metal industries. This technology can improve work speed and quality. It also reduces stress, making work easier and safer. You can also reduce labor costs, save time, and, of course, increase overall productivity. How to Use Collaborative Robots in Smart Cleaning Systems There are several steps to using a collaborative robot pulse laser cleaner. These steps are crucial for achieving optimal cleaning results. We'll explain them in the following sections. Please read and apply them carefully for optimal cleaning results. Stable Setup and Installation Guide First, position the robot base at the selected work location. Next, use a machining tool to precisely mount the laser cleaning head to the robot flange. Set the load and adjust the center of gravity. Create a suitable layout and route cables, fiber optics, or cooling tubing between the laser source and the cleaning head. Finally, connect the I/O cables for communication and control. Smart Path Planning and Laser Parameters To create smart path planning, use the robot's teach pendant. Set the distance of the cleaning head based on the focusing lens. Ensure the laser maintains the appropriate distance from the surface. Most importantly, set the power, pulse width, frequency, and scan pattern based on your cleaning target. This will help you remove rust, paint, oil, or various types of dirt. Starting and Stopping with DO Signals The cleaning process is executed using a digital output (DO) signal. Setting the DO signal high starts cleaning at the starting point. Setting it low, on the other...

In industrial production, cleaning is a crucial process. Traditional cleaning methods, such as mechanical and chemical cleaning, can meet production needs to some extent, but they often suffer from low flexibility and environmental pollution. With the advancement of technology, laser cleaning has emerged. Featuring high efficiency, eco-friendliness, and non-contact operation, it has gradually become a rising star in the cleaning field. Among them, single-mode and multi-mode fiber pulsed lasers are the two most commonly used types. So, what are the differences between them? What are their respective advantages and disadvantages? And in which application scenarios are they suitable? This article will provide the answers. What are single-mode and multi-mode? The mode of a laser generally refers to the energy distribution state in the plane perpendicular to the propagation direction, which can be single-mode or multi-mode. Single-mode means that the laser only generates one mode during operation. Its energy intensity decreases gradually from the center to the edge, and the distribution follows a Gaussian curve, with the beam called a fundamental Gaussian beam. A single-mode laser beam is characterized by high beam quality, small beam diameter, small divergence angle, and energy distribution close to an ideal Gaussian curve. In addition, single-mode lasers have excellent focusing properties, producing small focal spots and stable mode output, making them suitable for strong removal applications such as rust cleaning. A multi-mode laser beam, on the other hand, is composed of a combination of multiple modes, resulting in a more uniform energy distribution. The more modes there are, the more uniform the distribution becomes. This type of beam is often referred to as a flat-top beam. Compared with single-mode, multi-mode lasers have lower beam quality and larger divergence angles, requiring larger aperture optical systems, and their focal spots are bigger. However, multi-mode lasers can more easily achieve high single-pulse energy, high peak power, and high average power outputs. With uniform energy distribution, they are advantageous for applications that demand high efficiency and minimal damage, such as mold cleaning. Advantages and disadvantages of single-mode and multi-mode laser cleaning Due to their good beam quality, small focal spots, and high energy density, single-mode lasers are suitable for removing strongly attached contaminants such as copper rust, as well as cleaning thin or precision parts that are sensitive to heat input. However, because the energy of single-mode lasers is too concentrated, they may cause some damage to the base material during cleaning. For applications such as mold cleaning, where the substrate must not be damaged, multi-mode lasers are the only choice. Multi-mode beams have uniform energy distribution and high peak power. By ensuring the peak power density is higher than the removal threshold of the contaminants but...

Single pendulum and double pendulum welding are widely used techniques in laser welding. Both are advanced forms of oscillation welding and are suitable for a variety of applications. They operate based on different principles. In single pendulum welding, the laser beam oscillates in one direction, while in double pendulum welding, the beam oscillates simultaneously in both horizontal and vertical directions. The pendulum system is crucial in laser welding. It refers to the mechanism that controls the movement of the laser beam, creating a specific oscillation path. This helps distribute heat more evenly across the joint, improves weld quality, and reduces defects. Single pendulum systems move along one axis, while double pendulum systems enable two-axis oscillation, providing greater efficiency and precision. Single pendulum welding involves a welding head that oscillates back and forth during the process, similar to a simple pendulum. This motion distributes heat evenly and strengthens the joint. It is commonly used for small tasks and can weld in confined spaces. The technology is particularly suitable for thin materials, offering stable welds and fewer defects. Double pendulum welding operates with beam oscillation in both directions. The laser beam moves left and right while also moving up and down, similar to two pendulums working together. This enables the beam to create a variety of oscillation patterns, such as triangles, circles, or figure eights. These shapes improve flexibility, heat dissipation, and overall weld quality, making the process highly effective for complex designs and thicker materials. Structurally, single pendulum welding is best suited for light-duty work, narrow joints, and thin flat surfaces. It produces smooth welds with good stability but is limited in handling thicker sections. Double pendulum welding, on the other hand, provides greater control and adaptability. It handles curves, thicker joints, and complex geometries with higher precision and deeper penetration. Maintenance requirements also differ. Single pendulum systems are simpler to operate, with fewer moving parts and lower maintenance needs. Double pendulum systems are more complex and require additional setup and adjustment, but once mastered, they offer significant long-term benefits. In terms of efficiency, single pendulum welding is widely used for straightforward applications in automotive, construction, and general manufacturing. Double pendulum welding is preferred where higher efficiency and more demanding tasks are required, including aerospace and advanced automotive applications. Cost is another factor. Single pendulum machines are more affordable due to their simpler design and lower maintenance requirements, making them popular for basic projects and smaller budgets. Double pendulum machines are more expensive because of their advanced system and higher maintenance needs, but they provide long-term value for high-volume and precision applica...

Laser welding is a key technology in modern manufacturing, and weld quality is influenced by a variety of factors, among which welding position is a critical variable. Different welding positions result in significant differences in molten pool flow, heat conduction, and solidification behavior, which in turn affect weld formation, porosity defects, and mechanical properties. Based on the welding position, common types include flat welding, horizontal welding, vertical-up welding, and vertical-down welding. Figure 1 illustrates different welding positions. Impact of Welding Position on Weld Quality: Welding positions affect the stress distribution during welding, leading to differences in weld morphology. In flat welding, the molten pool exhibits good symmetry, and the weld is uniformly shaped and aesthetically pleasing. Due to evenly distributed gravitational force, penetration remains stable, resulting in optimal mechanical properties and welding stability. In horizontal welding, gravity causes a slight displacement of the molten pool, which affects stability compared to flat welding. In vertical-up welding, the welding direction is opposite to gravity, causing the molten metal behind the keyhole to move downward. Excessive heat input may cause burn-through, and molten pool fluctuation is greater, leading to lower stability. In vertical-down welding, the molten metal also moves downward due to gravity, but in this case, gravity aligns with the pool's movement direction, allowing smoother flow and better welding stability. Figure 2 shows X-ray images of welds in different positions. Porosity is lower in flat and vertical-up welding, while higher in horizontal and vertical-down welding. Figure 3 illustrates the movement of gas porosity under different welding positions. In flat welding, bubbles formed in the molten pool float upward under buoyancy and melt flow, and most escape before solidification, resulting in low porosity. In horizontal welding, the molten pool surface contacts unmelted base metal, hindering bubble escape, leading to higher porosity. In vertical-up welding, bubbles respond to buoyancy and rise through the molten pool. Some gas escapes through the keyhole and pool before solidification, resulting in relatively low porosity. In vertical-down welding, the upper edge of the molten pool is restricted by solidified metal rather than a free space, making it difficult for gas to escape. As a result, porosity is relatively high. Figure 4 compares the tensile properties of welds in different positions. Clear differences are observed: flat and vertical-up welds show significantly higher tensile strength than horizontal and vertical-down welds. Flat welds also exhibit the highest elongation, while horizontal welds have the lowest. Figure 5 presents the fracture morphology of tensile specimens. No pores were observed on the fracture surfaces of flat and vertical-up welds, while numerous pores appeared in the horizontal and vertical-down s...