What is the difference between laser welding head and cutting head
At present, the application of laser welding head in my country is relatively close to the international advanced technology. Laser cutting, laser welding, laser cleaning, laser marking and other technologies have been maturely applied in China. Laser has been focusing on the field of laser welding for many years. Under the vision of independent research and development and breaking the monopoly of foreign automobile welding industry, it came into being.
It specializes in providing automatic laser welding production lines for the new energy automobile industry, breaking many applications that were previously monopolized by international companies. At present, it has provided production line integration services for many auto mainframe manufacturers and parts suppliers, and will certainly provide high precision for the automotive industry. The application of laser welding scene and constantly improve its own technology research and development, and strive to seize a world in the international market.
Overview of laser welding process
01. Flight welding
Laser flight welding combines the advantages of remote welding, galvanometer and manipulator, and cooperates with professional graphics processing software to realize instant multi-track welding in three-dimensional space. Mainly used in: car body, seats and common auto parts and other products, materials can be used in various types of steel plates, cold-rolled plates, aluminum alloys and other common materials, as well as composite materials, alloy materials such as magnesium and aluminum alloys, etc.
Advantage:
●Any form of weld
●Any weld direction
●User-defined weld/point distribution
●Optimized force distribution
High-speed spot welding, seam welding, stitch welding, butt welding, fillet welding and lap welding
The welding head and the robot are synchronized in real time to speed up the laser welding process
●Less footprint
● Fewer maintenance and logistics costs
02. Spiral welding
A laser welding method of double wedge laser swing is realized by configuring a special wobble swing module on the welding head. The focused spot produces a helical weld with the welding head moving. Mainly used in: hinge welding, heat exchanger, tubular heat exchanger, thick pipe welding of oil and natural gas, flange welding and aluminum alloy welding, etc.
Advantage:
Welding seam widening
High processing repeatability/process stability
●Better weld formability
The post-processing is simpler, and the surface of the welded workpiece is smoother
●Excellent aluminum alloy welding ability.
03. Laser brazing
Laser brazing refers to the use of filler metal with a melting point lower than that of the base metal to heat the brazing filler metal to a temperature higher than the melting point of the filler metal and lower than the melting temperature of the base metal. Interdiffusion realizes the method of connecting weldments. Mainly used in the welding of aluminum body frame structures, such as the connection between the top cover and the case, doors and other products.
Advantage:
●Reduce pure laser welding defects, such as pores, cracks, and excessive product matching clearance
●Improve the weld strength and obtain a more perfect weld bead
Brazing is that the base metal does not melt, only the brazing filler metal melts
The brazing deformation is small, the joint is smooth and beautiful, and it is suitable for welding precision, complex and components composed of different materials
Small heat-affected zone and high compressive strength
04. Laser wire filler welding
Laser wire filler welding is a method of using filler metal of the same or similar material as the base metal to melt the base metal and the brazing material and then condense to form a weld. Mainly used in: whole vehicle structural parts and auto parts products.
Advantage:
●Reduce pure laser welding defects, such as pores and cracks
●Improve the difference rate of welding products and allow a slightly larger gap between welding products
The welding base metal is melted, and the welding strength is stronger than that of the base metal
05. Swing brazing
ALO3 combines beam shaping and seam tracking in one device. Filler wire can be used as a mechanical sensor. Mainly used in body-in-white laser welding, mainly including laser brazing of roof cover, laser brazing of trunk lid, and brazing of auto parts. The fluctuation of parts and the error of the fixture often increase the difficulty of laser brazing, which makes it extremely difficult to debug the laser welding process. However, swing brazing can effectively adjust its welding direction, weld seam tracking and automatic focal length compensation. , can make the laser beam easy to guide and focus, realize the transformation of all directions, high degree of automation, fast welding speed and high efficiency, so that it can maintain the welding quality.
Advantage:
Weld seam tracking, real-time determination of workpiece welding seam trajectory
●According to the deviation of different workpieces, the XYZ three-direction adaptively adjusts the welding trajectory to obtain good welding quality
●Improve the consistency rate of product welding
06. Three-light spot brazing
A double-spot module is added to the lens, and during welding, one beam is distributed into three beams by the three-spot module in the brazing optics, which provides a solution for brazing hot-dip galvanized steel. Make the weld more flat and not crack. Mainly used in: aluminum alloy brazing of body-in-white, laser brazing of roof cover, laser brazing of trunk lid, and brazing of auto parts, etc.
Advantage:
●More stable and reliable brazing process
●Faster speed
●Higher strength
●Higher appearance surface quality for hot-dip galvanized sheet welding
●On-line cleaning process
●Dynamic energy adjustment
Multi-wavelength composite welding
The two lasers of different wavelengths are superimposed together so that the axes of the two laser beams overlap in space. The main band laser mainly performs welding, and the sub-band laser mainly preheats the welding wire and base metal, reducing the cooling rate of the molten metal in the welding pool. . Especially suitable for aluminum alloy, magnesium alloy, copper alloy, etc.
Advantage:
●Reduce the content of pores
Increase the welding bead stability and increase the welding efficiency value
●Effectively relieving thermal stress can reduce cracks, and improve weld strength to obtain weld beads with a relatively uniform appearance.
07. Summary
The laser head industry is still in the leading position in foreign equipment technology, from laser host, optical processing head, to chiller, power meter, welding monitoring, post welding inspection, TCP calibrator and other auxiliary equipment, leading in all aspects, many domestic enterprises The research and development and application of lasers, optical processing heads and other directions are in progress, and we are committed to keeping pace with and surpassing foreign equipment.
