Laser Welding Basics - The Basics of Lasers and Laser...

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The Basics of Lasers Tim Morris Technical Sales Manager TRUMPF Inc., Laser Technology Center
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Agenda 1. Basics of lasers 2. Basics of laser welding 3. Summary
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s Flexibility … > beam manipulation (beam switching and sharing) > variety of product geometries and materials > ease of back-up (especially YAG) s Often faster than other techniques . .. > high power density weld process > high laser uptime (>98%) s Cost savings . .. > high productivity > reduction of scrap and re-work > reduction of manual labor > reduction of component material and weight > can eliminate secondary processes Advantages of laser welding
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s LASER S L ight A mplification by S timulated E mission of R adiation s Active Laser Media S Nd:YAG (Rod Laser) c N eo d ymium Y ttrium A luminum G arnet S Yb:YAG (Disk Laser) c Y tter b ium Y ttrium A luminum G arnet S CO 2 (Gas Laser) Laser basics
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s Nd:YAG (Rod Laser) λ = 1064 nm s Yb:YAG (Disc Laser) λ = 1030 nm s CO 2 (Gas Laser) λ = 10600 nm Laser basics
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Power supply Laser pump (e.g. lamp, diode, RF) Mirror 1 Mirror 2 Laser active medium (e.g. Nd:YAG, Yb:YAG, CO 2 ) Resonator Laser beam Laser basics
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Unfocused Power Measurement 100 Watt light bulb 0.0008 Watts / cm 2 s Many colors s Many directions s Many phases s One color >> select laser for application s One direction >> can capture all the beam energy s One phase >> maximum energy at workpiece Characteristics of laser light
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d f = M 2 (4 λ f/ π D) Spot size – CO 2
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Laser Incoupling lens Laser light cable Collimation lens Focusing lens d f = M 2 (4 λ f/ π D) d f = 3BQ(4 λ f/ π D) d w = φ c (f/ f c ) d w d f φ c Spot size - YAG
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s Power density = power per unit area s Power density of an unfocused 6 kW CO 2 HQ laser is about 1,000 W/cm 2 s Power density of a focused 6 kW CO 2 laser (f200mm) is about 50,000,000 W/cm 2 Power density
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Effects of Beam Quality Spot- diameter Working distance Depth of focus Optics Working area of a scanner optics 25 mm*mrad (LP rod) 4-8 mm*mrad (DP disk) With same Focussing optics With same Spot diameter Beam- quality
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Key advantages of short focal length: s Faster weld speed s Less heat input Key advantages of long focal length: s Longer depth of focus s Focal length
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CO 2 considerations . .. s
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Laser Welding Basics - The Basics of Lasers and Laser...

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