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Applications > Joining technology > Laser welding

Laser welding in continuous operation

 Machining heads for industry applications as well as suitable clamping technology and edge preparation are the keys to success. The welding head not only focuses the laser beam on the correct spot size, but it also measures, if necessary, the joint position right before the process and adjusts the laser spot into the correct position. Online monitoring of the welding process and if necessary, downstream seam check always guarantees a good result. Precitec provides everything from one source - finely adjusted to you application.

Welding depth monitoring with airbag detonator cap

When welding airbag detonator caps, monitoring of the welding depth is of great importance: On the one hand, one is not allowed to weld through it, because the detonator cap is filled with an explosive detonating substance. On the other hand, it must me welded at a depth that is enough to ensure that the detonator cap is sealed. The welding depth on airbag detonator caps has been monitored by the Laser Welding Monitor LWM for several automotive suppliers since 1999. 

Welding head YW52 - basic model
Welding of backrests with the YW52

Laser beam welding is used often in the joining process for the metallic structure assembly of auto seats. Thereby, the individual pieces are connected to each other via a large number of step seams. Moreover, seat components are normally processed with multiple welding heads simultaneously, in order to maintain a lower cycle time. 

Welding of security-relevant components

Constant quality monitoring and documentation is required when welding security-relevant components. Thus, the in-process monitor LWM (Laser Welding Monitor) is used when welding seat slide adjuster and backrests. The LWM sensor unit can be adapted as both standard optic and scanner optic. 

FormWelder Plus
Precise welding of small contours

Gambrel sticks, so-called ISOFIX latch serve for attaching children's car seats. Welding small contours takes place on a stationary welding station with a programmable X/Y axis system integrated into the processing head. This separates the small contours with high path accuracy. Process monitoring also controls the safety-relevant parts to 100% on line. 1.5 million latches are produced in a double work station annually.

Laser Path Finder LPF - system description
Roof seam welding with seam position control

The joining area is setup here in such a manner that the welding seam is located in narrow grooves on both sides of the roof, the so-called roof channels. The side roof flanges are connected to the side components via laser edge welding in these. The laser beam is positioned on the edge of the roof sheet metal in such a way that it melts evenly into the bottom plate. The seam guidance system LPF provides precise laser beam guidance of the entire length of the seam along the edge.

Monitoring of the seam position when welding powertrains

The detection of the joining position is often a challenge for seam guides when laser welding gear wheels. Only the correct positioning of the laser spot ensures a smooth welding connection. The space-saving solution of the coaxial structure of the seam guide can be easily integrated into the welding machine. The LPF sensor measures the position of the radial and axial joints precisely and it can be reproduced, even with small radii.

Laser welding with double coupling

When welding double couplings, a solid connection is the decisive criterium. Since, welding is done with small focal diameters, it must be ensured that the laser beam hits the joint exactly. This task is conducted by a high-precision seam position control. In order to ensure smooth production, laser power as well as the protective glass slot in the welding head is monitored online. 

Welding head YW52 - basic model
Optimized performance welding of auto body connections

Welding of auto body components places great demands on processing quality. Precitec coaxial process monitoring is used by the innovation alliance Green Carbody Technologies, in order to ensure continuous process monitoring. Thereby, the laser power is also adjusted to the processing time, in order to attain the best possible quality. 

Camera-based welding depth monitoring with mass flywheels

During CO2 welding of mass flywheels, the welding depth is controlled with a camera-based in-process monitoring. In order to be able to detect sporadic error in addition to welding depth detection, a camera is used here with a very high metering time period. 

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