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Spot welding is carried out with pulse Nd: YAG

Solution

Spot welding is carried out with pulse Nd: YAG

Classification:
Battery industry
Author:
2020-11-07

Spot welding is carried out with pulse Nd: YAG

 The laser emission wavelength is 1064 nm, and the focusing head has a focal length of 100 mm.
By changing the pulse energy, pulse length and focus position, a series of optimization tests were
carried out on the overlap and edge welding configuration. Experiments were also performed by
coating the top surface of Cu with graphite or using a 0.15 mm Ni foil on the top of the Cu plate
to enhance the coupling and activation of the keyhole welding mode. Ni forms a favorable alloy with
Cu and Al and is therefore compatible with both materials.
Using a pulse energy of 11 J and a pulse width of 5 ms can achieve good welding results that
combine 0.13 mm thick Cu with 2.0 mm thick Al

Defocus the laser beam so that the focus is 1.5 mm below the surface of the top sheet. Use defocus
to increase the size of the dots, thereby increasing the width of the welding interface. Weld
penetration in aluminum> 1.0 mm. This may be due to the need for high pulse energy to melt it
through the Cu sheet into Al.
For edge spot welding, place the copper plate on top of the aluminum plate, and then aim the laser
beam at the lower aluminum surface about 0.2 mm from the edge of the copper plate

Due to the limited space between the processing head and the workpiece, the optical system was
first simulated using commercial optical design software. Component interference detection analysis
is carried out to ensure that the optical path does not have any back reflection or undesired
scattered radiation. In addition, the software has been updated to tailor more efficient data
collection to the modified optical settings.

It can be used to seal battery cans after verification. A comprehensive study was conducted in
which different types of process and part defects were simulated, which are usually found in
industrial equipment. Table 1 shows the types and causes of defects investigated and their effect
on monitoring conditions (melt pool size). It can be seen that for each type of defect, the change
pattern of the width and length of the molten pool is different. This allows specific defects to be
associated with specific signal patterns, so it can provide information to distinguish various
defects that occur simultaneously. Since the sealing of the battery tank needs to meet the strict
requirements on tightness and welding strength, the real-time process monitoring system can perform
quality inspection on 100% of the products without interrupting the production cycle.

Summary and conclusion
The laser processing capabilities suitable for the assembly and packaging of batteries and fuel
cells have been discussed. Laser welding of similar and dissimilar material combinations shows the
application fields and advantages of this technology

Solution

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Address:A Building, Huichuan Technical zone, No71, Xiangyin Road, Nanlian, Longgang Street, Longgang District, Shenzhen, Guangdong