SHINHOP laser

Laser welding is increasingly applied in the automotive industry, playing an important role in improving automotive quality, safety, and market competitiveness. It is an important tool for enhancing automotive production efficiency. Due to the different structures of automobiles, the methods of applying laser welding equipment and welding mechanisms also vary. So, what are the laser welding processes in automobile manufacturing?
1. Flying Welding
Laser flying welding integrates the advantages of remote welding, galvanometer, and robotic arms, combined with professional graphic processing software, to achieve instantaneous multi-track welding in three-dimensional space. It is mainly applied to: automobile bodies, seats, and commonly used automotive parts. In terms of materials, it can be applied to various steel plates, cold-rolled plates, aluminum alloys, and other common materials, as well as composite materials and alloy materials such as magnesium-aluminum alloys.

Advantages:
1. Any form of weld;
2. Any direction of weld;
3. User-defined weld/point distribution;
4. Optimized stress distribution;
5. High-speed spot welding, seam welding, overlap welding, butt welding, corner welding, and lap welding;
6. Real-time synchronization of the welding head and robot, accelerating the laser welding process;
7. Smaller footprint;
8. Lower maintenance and logistics costs;
2. Spiral Welding
A laser welding method using a dual-wedge laser oscillation, achieved by configuring a special wobble oscillation module on the welding head. This creates a spiral weld line as the focused light spot moves on the welding head.
Mainly applied to: hinge welding, heat exchangers, tubular heat exchangers, thick pipe welding for oil and natural gas, flange welding, and aluminum alloy welding, etc.

Advantages:
1. Wider welds;
2. Extremely high processing repeatability/process stability;
3. Better weld formation;
4. Simpler post-processing, with a smoother surface on the welded workpiece;
5. Excellent aluminum alloy welding capability;
3. Laser Brazing
Laser brazing refers to the method of using a filler metal with a melting point lower than that of the base material, heating the filler to above its melting point but below the melting temperature of the base material, allowing the liquid filler to wet the base material, fill the joint gap, and diffuse with the base material to achieve connection of the welded parts. It is mainly applied to the welding of aluminum body frame structures, such as the connection of the roof and side panels, car doors, and other products.

Advantages:
1. Reduces defects of pure laser welding, such as porosity, cracks, and excessive product fit gaps;
2. Increases weld strength, achieving a more perfect weld bead;
3. Brazing does not melt the base material, only the filler melts;
4. Brazing has minimal deformation, with smooth and aesthetically pleasing joints, suitable for welding precision, complex, and different material components;
5. Small heat-affected zone, high compressive strength;
4. Laser Filler Welding
Laser filler welding is a method that uses filler metal similar or identical to the base material, melting both the base material and the filler to form a weld. It is mainly applied to: complete vehicle structural components and automotive parts.

Advantages:
1. Reduces defects of pure laser welding, such as porosity and cracks;
2. Improves the defect rate of welded products, allowing slightly larger welding product gaps;
3. Melts the base material during welding, with welding strength greater than that of the base material;
5. Oscillating Brazing
By integrating beam shaping and weld tracking functions into the same device through ALO3. The filler wire can be used as a mechanical sensor. It is mainly applied to white body laser welding, including laser brazing of roof covers and trunk lids, as well as brazing of automotive components. Fluctuations in parts and errors in fixtures often increase the difficulty of laser brazing, making the laser welding debugging process exceptionally challenging. However, oscillating brazing can effectively adjust its welding direction, with functions for weld tracking and automatic focus compensation, making it easy to guide and focus the laser beam, achieving directional changes, high automation, fast welding speed, and high efficiency, thus maintaining welding quality.

Advantages:
1. Weld tracking, real-time determination of the workpiece weld trajectory;
2. Adaptive adjustment of welding trajectory in XYZ three directions according to different workpiece deviations, achieving good welding quality;
3. Improves product welding consistency;
6. Triple Spot Brazing
By adding a dual spot module in the lens, during welding, the triple spot module in the brazing optics distributes a single beam into three beams, providing a solution for brazing hot-dip galvanized steel plates. This results in smoother welds without cracking. It is mainly applied to: aluminum alloy brazing of white bodies, laser brazing of roof covers and trunk lids, and brazing of automotive components.

Advantages:
1. More stable and reliable brazing process;
2. Faster speed;
3. Higher strength;
4. Higher surface quality for welded hot-dip galvanized plates.
5. Online cleaning process;
6. Dynamic energy adjustment;
7. Multi-wavelength composite welding
Multi-wavelength composite welding is a welding process pioneered by Lianying Laser. It is achieved by superimposing two different wavelengths of lasers so that the axes of the two laser beams coincide in space. The main wavelength laser is primarily used for welding, while the secondary wavelength laser is mainly used to preheat the welding wire and base material, reducing the cooling rate of the molten metal in the welding pool. It is particularly suitable for aluminum alloys, magnesium alloys, copper alloys, etc.

Advantages:
1. Reduce porosity content; 2. Increase the stability of the welding seam and improve welding efficiency;
3. Effectively relieve thermal stress, which can reduce cracks and improve weld strength, resulting in a more uniform appearance of the weld.
[Summary]
Currently, the laser industry as a whole is still dominated by foreign technology and equipment, leading in all aspects from laser mainframes, optical processing heads, to chillers, power meters, in-process monitoring, post-weld inspection, TCP calibrators, and other auxiliary equipment. Domestic companies are striving to catch up.
The above are just types or methods of laser welding technology. In fact, to weld automotive manufacturing parts well, more welding process experience is needed. Only through continuous technological accumulation can the technical advantages of laser welding equipment be better utilized and the technical potential of the equipment be fully realized.