Die Laserpunktschweißtechnologie wird zunehmend anstelle des herkömmlichen Funken- oder Widerstandsschweißens eingesetzt.
Fortschritte in der Fertigungstechnologie und der Trend zu präziseren Bauteilgeometrien haben neue Anwendungsbereiche für Metallverbindungen eröffnet, in denen traditionelle WIG- und Widerstandsschweißverfahren den Anforderungen an Präzision, Qualität oder Produktivität nicht mehr genügen. Die gepulste Laserpunktschweißtechnologie ersetzt diese Verfahren nun und bietet oft eine höhere Produktivität bei gleichzeitig geringeren Gesamtkosten.
Darüber hinaus hat die Nachfrage nach höherer Präzision bei Hochleistungsbaugruppen den Einsatz dieser Laser als kostengünstigere Alternative zum jahrzehntelang angewandten Widerstandsschweißen begünstigt. Das Faserlaserpunktschweißen beseitigt Probleme des Widerstandsschweißens wie das Festkleben der Elektroden sowie deren Reinigung oder Austausch. Da das Laserschweißen ein berührungsloses Verfahren ist, kommt es außerdem zu keiner Verformung der Bauteile.
Punktschweißen ist die einfachste Form des Laserschweißens. Es gibt zwei Arten des Punktschweißens: Konduktionsschweißen und Einbrennen. Das Konduktionsschweißen wird für Mikroverbindungen eingesetzt. Durch das Durchschweißen sind Aspektverhältnisse (Verhältnis von Tiefe zu Breite) möglich, die deutlich größer als eins sind.
Laser spot welding is a non-contact process which uses a laser to create a single weld spot to weld metals together.
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From reinforcement rib welding to on-site mirror-finish stainless steel jobs, this solution delivers strong, precise welds with no marks on the backside. No need to remove protective film in advance, saving time and reducing handling. Even on high-end mirrored stainless steel, the result stays flawless — clean surface, zero rework.
Lasers are capable of delivering a continue or a pulse of laserlight with accurate, repeatable energy and duration. When the beam is focused into one place - a small spot - (adjustable anywhere from approximately 0.1 to 50.0 mm in diameter) on the part, the energy density becomes quite large. The light is absorbed by the material causing a "keyhole effect" as the focused beam drills into, vaporizes, and melts some of the metal. As the pulse ends, the liquefied metal around the keyhole flows back in, solidifying and creating a small spot weld. This entire process just a few milliseconds.
Considerations for Converting to fiber laser spot welding
Converting from resistance spot welding to laser keyhole welding requires considering several key factors to determine if it’s the right choice for the operation and application.
Cost: Because laser welding is an automated process, it requires an investment in a robotic welding system. For smaller operations that don’t produce a lot of highly repeatable parts, this type of investment may not be feasible or deliver the necessary return on investment (ROI) to justify the purchase.
Tolerance window for material: Proper tooling and fixturing are critical for success in laser welding. The two workpieces to be welded must be pressed together without a gap to create a high-quality laser weld. This makes the right joint and material presentation important, so the operation must be able to support proper setup and part fit-up.
Repetition:Laser keyhole welding is best-suited to a repetitive process in which many parts are produced, even if this means a high mix of parts with lower volumes of each part. Because of the necessary investment in system setup, applications with high repetition or high part volume typically offer the best ROI in laser welding.
Considering these factors can help you determine if laser keyhole welding is right for your operation.
Stiffener Welding with Handheld Laser: Strong & Seamless.
Achieve high-strength and precise welding for metal stiffeners using our handheld laser welder. It ensures minimal heat distortion and a smooth finish, significantly improving your production efficiency.
Handheld Laser Spot Welder for Invisible, Mark-Free Welding Smooth, precise, and flawless welds with no visible marks.
Handheld Laser Spot Welder for Mirror-Finish Stainless Steel Clean, precise, and low-mark welds with excellent surface quality
Laser Spot Welder for Stainless Steel Reinforcements High-precision spot welding on stainless steel reinforcements with excellent weld strength.