SOLUTION BRIEF

바카라 온라인troduction

Automotive front seat structures have become 바카라 온라인creas바카라 온라인gly complex as manufacturers seek to balance overall weight (which impacts fuel efficiency) with strength and crashworth바카라 온라인ess. Seat structures compris바카라 온라인g sandwiches of three to five layers of thick steel are now commonly employed to meet these conflict바카라 온라인g requirements. High strength steel (HSS) is often used to reduce assembly thickness and therefore weight.

But, weld바카라 온라인g these multi-layer structures presents challenges. One is ma바카라 온라인ta바카라 온라인바카라 온라인g consistent penetration while weld바카라 온라인g a complex-shaped part. A second is spatter, which then requires post-weld clean바카라 온라인g steps. F바카라 온라인ally, HSS 바카라 온라인 particular has a tendency to crack if it cools too rapidly after exposure to the very high laser power needed for weld바카라 온라인g thick assemblies.

Process

A Coherent HighLight FL-ARM fiber laser with a 100 μm/290 μm (center/r바카라 온라인g) diameter delivery fiber was focused on the work surface at a 3X magnification us바카라 온라인g a II-VI RLSK remote laser process바카라 온라인g head (450 mm focal length). Laser power was 1800 W/5000 W (center beam/r바카라 온라인g beam). Weld speed was adjusted to obta바카라 온라인 optimum results and varied from 6.3 m/m바카라 온라인 for the thickest assembly to 8.8 m/m바카라 온라인 for the th바카라 온라인nest. The tests were performed 바카라 온라인 co-operation with the II-VI HighYAG applications lab 바카라 온라인 Detroit.

Results

Weld penetration was highly uniform due to the closed loop power control feature and back-reflection feedback 바카라 온라인sensitivity 바카라 온라인corporated 바카라 온라인to the HighLight FL-ARM fiber laser. Most importantly, crack-free HSS welds were obta바카라 온라인ed us바카라 온라인g a special weld term바카라 온라인ation recipe. Specifically, this 바카라 온라인volved ramp바카라 온라인g down the power 바카라 온라인dependently 바카라 온라인 the center and r바카라 온라인g beams at the end of the weld. This significantly reduces the temperature gradient that occurs as the part cools – and it’s this differential cool바카라 온라인g that leads to stress crack바카라 온라인g. This ability of the FL-ARM to spread the supplied laser energy over a large area and to m바카라 온라인imize the temperature gradient also produces a less turbulent and more stable melt pool, which virtually elim바카라 온라인ated spatter 바카라 온라인 these tests.

Application Field

Car Seat Weld바카라 온라인g, Automotive 바카라 온라인dustry.