Here.Laser welding with galvanometer scanner." The following is a note of basic knowledge about
Laser welding with galvanometer scanner
Laser welding using a galvanometer scanner is a technology that performs welding by controlling two axes of high-speed moving mirrors called galvanometer mirrors to scan a laser beam at high speed and with high precision.
How Laser Welding Works
- Laser light source: Laser light such as a fiber laser or YAG laser is emitted.
- Galvano Scanner: Two galvanometer mirrors rotate at high speed in the X- and Y-axis directions, respectively. By precisely controlling the angle of these mirrors, the direction of the laser beam can be changed instantaneously. This enables continuous welding of complex shapes and multiple locations.
- Focusing lens: Laser light passing through the galvanometer scanner is focused on the workpiece surface by the focusing lens to obtain a high energy density.
- Welding: A focused, high-energy laser beam instantly heats and melts the workpiece, joining it.
What kind of welding can be done
Laser welding with a galvanometer scanner can be used to weld the following
- High-speed, high-precision welding: by high-speed control of mirrors,Faster and more precise welding than conventional laser welding. Suitable for welding fine parts and complex shapes。
- Non-contact welding: Laser beams are emitted, allowing welding without direct contact with the workpiece. Due to this,Reduces mechanical load on the workpiece and suppresses deformation。
- Various welding shapes: By programmatically controlling the scanning pattern of the laser beam by the galvanometer scanner, various welding shapes such as point welding, line welding, circular welding, and welding of complex shapes can be accommodated.
- Dissimilar material bonding:High energy density enables joining of metals with different melting points and dissimilar materials such as metals and resins.。
- Thin plate welding: because the heat-affected zone is small,Suitable for welding thin plates with minimal distortion。
- Remote welding: By combining a galvanometer scanner and focusing optics, laser welding can be performed from a position remote from the workpiece. This facilitates automation in combination with robots.
Supplement] What is the reduction of mechanical load to the workpiece?
A mechanical load on a workpiece is a force applied externally to an object. Specifically, the following types of forces or actions are considered
- Tensile (pulling) force: a force that acts to растягивать an object.
- Compressive force (force that pushes or squeezes): a force that acts to push or squeeze an object.
- Shear force (shifting force): a force that attempts to shift one part of an object parallel to another part.
- Bending moment (bending force): rotational force that tries to bend an object.
- Torsional moment (twisting force): rotational force that attempts to twist an object.
- Impact force (large force applied instantaneously): Force applied rapidly in a short period of time.
Vibration (periodic repetition of force): Force repeated at a fixed period.
When we say that laser welding with a galvanometer scanner "reduces the mechanical load on the workpiece," we mean that the welding process does not require direct physical contact or force to be applied to the workpiece (the material being welded), thus reducing the risk of deformation or damage due to welding.will be.
Conventional contact welding methods (e.g., resistance welding) apply a mechanical load to the workpiece because the electrode clamps the workpiece or presses the welding rod against it. This may deform the workpiece or leave stresses in the weld zone.
Laser welding, on the other hand, uses light energy to perform welding, eliminating the need for direct contact with the workpiece and significantly reducing mechanical loads.This is a particularly important advantage in the welding of precision parts and thin materials, and is the reason why they are used。
Very high quality welding
The following quality items are used to evaluate welding
- High strength: Sufficient strength required, and resistant to breakage against external forces and loads.
- High reliability: stable quality over a long period of time and less prone to unexpected defects.
- Excellent appearance: Beautiful finish, minimal spatter (metal grains scattered during welding) and distortion.
- Few defects: few or acceptable weld defects such as porosity (blowholes), cracks (cracks), and unwelds.
- High dimensional accuracy: Small error margin with respect to the designed dimensions and shape.
- High durability: Strong and long-lasting against environmental changes and corrosion.
Main applications
- Automotive industry: Welding of body parts, electronic parts, etc.
- Electronic component industry: Micro welding of small connectors, sensors, etc.
- Medical device industry: Welding of precision instruments
- Aerospace industry: thin plate parts, joining of dissimilar materials
- Battery industry: welding of electrodes, bus bars, etc.
That's it.