Design for Fiber Laser Welding
To fully realise the advantages of industrial Fiber Laser welding the design of products can be changed to reduce weight, dimensions cost and environmental impact. Of course not one single material joining technology can solve every joining challenge but the Fiber Laser along with good industrial design can produce benefits in a product lifecycle well beyond the initial manufacturing stage.
Advantages of Fiber Laser Welding
Higher quality welds achieved in less time for less cost and less energy input.
All material joining solutions have advantages and disadvantages and these are balanced against the customer’s requirements of the welded component. Fiber Lasers are becoming the benchmark for material joining and provide many opportunities to displace existing technology and provide advantages such as those outlined
Controllable heat input
With a turn down factor of up to 90% whilst maintaining stability, a single Fiber Laser can be used on multiple welds with each being tailored to the material type, thickness and desired weld shape. The Fiber Laser has the largest spectrum of tuneable parameters of any industrial joining technology including modulation rates up to 100kHz a variety of power levels and choice of M2
This ensures a small or zero heat affected zone which entails minimal shrinkage and distortion of the workpiece.
Reduction in Material Use
Laser welding is a non-contact single sided process removing limitations such as shown in figure 1. As can be seen Resistance Spot Welding (RSW) requires access to both sides of the joint. The access hole for the bottom electrode weakens the square tube, this is compensated for by using a thicker material than the design requires. Through the use of Fiber Lasers and elimination of the access hole, the square tube dimensions or the material thickness can be reduced
As shown in Figure 2 a traditional flange can be reduced from 14.5mm when Resistance Spot Welding (RSW) is used to 8mm when a Fiber Laser is introduced. The weld nugget produced by RSW has a larger cross sectional area at the material interfaces but a smaller overall weld volume when compared to the full length weld that the Fiber Laser produces. The reduced material cost and weight benefits produced due to the use of Fiber Lasers last for the lifetime of the product.
The technique from section 4 can be extended to completely remove a flange, which not only saves material but can improve the appearance of the product. An example of this can be seen in figure 3.
A disadvantage of this type of process is that the positional tolerance of the components must be increased to ensure the welds are successful, though generally the increased strength, reduced material costs and advantages of single sided processing more than compensate for this.
Weight, material and costs savings are particularly desirable in the automotive market so it is not surprising that this industry has been at the forefront of Laser use in joining applications. Cars are being designed with more weight saving aluminium but still require the strength of steel in critical areas. This of course means multi-material joining which Fiber Lasers excel at.
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