Marking Cutting Welding Micro Machining Additive Manufacturing
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1 Marking Cutting Welding Micro Machining Additive Manufacturing Slide: 1
2 Nanosecond Laser Welding of Dissimilar Metals and Foils Daniel Capostagno, Adam Rosowski, Jack Gabzdyl, Michael Duka EPMT 2017 Geneva 21. June 2017 Slide: 2 29/06/2016
3 Welding with ns Pulsed Fiber Lasers 1. Introduction 2. Lasers for welding 3. Thin metal ns pulsed laser welding 4. Dissimilar metal welding 5. Joining of battery cells 6. Summary Slide: 3
4 ns Pulsed Fiber Lasers Proven industrial tool for: Marking Engraving Cutting Surface texturing Thin film patterning Cleaning All based on ablative material removal processes Slide: 4
5 ..using the right tool for the job. Welding and joining represents a paradigm shift for ns lasers... Need to think differently... Slide: 5 19/06/2017
6 Micro joining of foils Problem Reliable joining avoiding over penetration Challenge Avoiding distortion and warping Solution Control of heat input by beam mode shaping. Slide: 6 19/06/2017
7 Micro joining of metals Problem Reliable joining of thin section dissimilar materials Challenge Overcome the problems of brittle inter-metallics Solution Novel ns welding process not based on large weld pool Slide: 7 19/06/2017
8 Welding with ns Pulsed Fiber Lasers 1. Introduction 2. Lasers for welding 3. Thin metal ns pulsed laser welding 4. Dissimilar metal welding 5. Joining of battery cells 6. Summary Slide: 8
9 Lasers for welding CW Lasers Laser measured by power able to provide continuous stable laser output at rated power CW/Modulated Lasers Lasers that produce a gated output with the maximum power being the CW limit QCW Lasers Able to produce ms pulses at higher peak powers at reduced average power than their continuous duty operation Pulsed Lasers (ref FLP Nd:YAG) Producing short high peak power pulses with low average power. Slide: 9 19/06/2017
10 FLP Nd:YAG vs ns OLD (FLP Nd:YAG) 6-10kW peak power ms pulse duration >J pulse energy <1kHz Rep Rate <15% DF <100W average power NEW (ns Joining) 6-10kW peak power ns pulse duration <mj pulse energy >100kHz Rep Rate <15% DF <100W average power Slide: 10 19/06/2017
11 PulseTune Waveforms Flexibility in ns lasers in optimising pulses to match application requirements. Low khz High kw kw P/E Max >500 ns <10 ns High khz Low kw kw P/E Min Slide: 11 19/06/2017
12 Metallic welding using ns pulses Use pulse waveforms & frequency to tune parameters from vaporisation/melt ejection to melt generation. 70W, 1mJ >10kW peak, <2% duty. 70W, 0.5mJ >2kW peak, <4% duty. 70W, 0.15mJ >500W peak, <15% duty. Slide: 12 19/06/2017
13 Welding with ns Pulsed Fiber Lasers 1. Introduction 2. Lasers for welding 3. Thin metal ns pulsed laser welding 4. Dissimilar metal welding 5. Joining of battery cells 6. Summary Slide: 13
14 Lap welding in stainless steel 304 SST 150µm sheets welded in lap configuration Parameters - 70W 100mm/s - 6mm Ø welds. Top weld view no cover gas Weld under manual peel stress Bottom weld view full penetration Failure mode at weld interface Similar results were achieved in 250µm sheets at 50% welding speed. Slide: 14 19/06/2017
15 Weld strength These welds really strong enough for serious applications. Tests completed on stainless steel to stainless steel welds show shear strength for two 1mm welds in a full 0.5mm lap weld to be > 224 lbs. In one case with a 180 degree peel test on a linear weld 5mm long and 1mm wide, the part yielded at 241 lbs. Slide: 15 19/06/2017
16 HDD welding Stake weld to hold parts + continuous seam with wobble Using 70W EP-Z. Slide: 16 19/06/2017
17 Butt Welding Can make good butt welds in similar materials 70W EP-Z using wobble technique in 200µm stainless steel Slide: 17 19/06/2017
18 Welding with ns Pulsed Fiber Lasers 1. Introduction 2. Lasers for welding 3. Thin metal ns pulsed laser welding 4. Dissimilar metal welding 5. Joining of battery cells 6. Summary Slide: 18
19 Welding exotic materials Focus on ability to weld bright metals Range of material types and dissimilar combinations Using novel weld configurations.. Slide: 19 19/06/2017
20 ns Pulsed Spot Welds Method for making spot welds. Spatially overlapping spots >98% linear fill separated by 50% the F s on the rise radius. R 1, Inner Radius, 0.02mm R 2, Outer Radius, 0.5mm a, Ramp, 3mm b, Rise, 0.02mm Slide: 20 19/06/2017
21 Grid patterns Fast and flexible applicable to multiple material combinations Copper on Supper Alloy Aluminium on brass Aluminium on Copper Slide: 21 19/06/2017
22 Control of heat input... No witness marks on wide variety of material combinations! Combinations Left to Right: SS-Cu SS-Al Al-Cu Ti-Al Slide: 22 19/06/2017
23 Metallurgically interesting Cu/Al Spot welds do not show characteristic form of conventional pulsed spot welds More closely resembles multi-staking Al flow to surface Possible intermetallics 150µm Cu in pool of solidification. Slide: 23 19/06/2017 WF 36, 520ns, 70 KHz
24 Tensile weld strength lbs 61 lbs.15mm on.15mm Cu.3mm on.3mm C lbs 26 lbs.3mm on.3mm C510.15mm Cu on.4mm Al Slide: 24 19/06/2017
25 Pull test results With a cosmetic pass Reduced surface porosity with bright finish Increased joint strength to 48lbs on 150 um copper. Slide: 25 19/06/2017
26 Peel strength... Different configurations can yield improved results Slide: 26 19/06/2017
27 Weld geometry flexibility Opens up the possibilities to design for purpose Electrical conductivity Pull strength Penetration and nugget shape Available space Heat input (witness marks) Slide: 27 19/06/2017
28 Copper to Aluminium Single pass with 70W HS-H Laser made Metal Rivet! Aluminium flows through copper layer no signs of inter-metallic layer Slide: 28 19/06/2017
29 Dissimilar combinations Various dissimilar micros Cu/Al Al/Cu SS/Al Ti/Cu Slide: 29 19/06/2017
30 Seam welding Wobble welding offers width control in lap welding of dissimilar combinations Cu - Al Al - Cu SS - Al Slide: 30 19/06/2017
31 Welding with ns Pulsed Fiber Lasers 1. Introduction 2. Lasers for welding 3. Thin metal ns pulsed laser welding 4. Dissimilar metal welding 5. Joining of battery cells 6. Summary Slide: 31
32 Joining of battery cells Requirement to weld copper/aluminium tabs to cells Using scanner + 100W EP-Z Basic fixturing Good contact required. Shielding gas as appropriate to material combinations. Slide: 32 19/06/2017
33 Heat input control Objective is to produce strong welds with no burn through or witness marks Nickel plated Cu Aluminium Slide: 33 19/06/2017
34 Evaluation of joint design Single large area spot vs multiple spots Roughly same contact area time to process Multiple spots proved to be stronger + gave more control over penetration depth Slide: 34 19/06/2017
35 Summary ns pulsed lasers offer a flexible solution with multi process capability new welding potential particularly for dissimilar metals Patent No: WO WO Other patents pending enhanced thermal input control new joint design possibilities tailored beam quality options offer the right tool for the job Slide: 35 19/06/
36 Versatility of G4 Slide: 36 19/06/2017
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