Apparatus, method, and computer program product for fusing a workpiece

US10821517B2 · kind B2 · utility

Assignee

• Arcam AB · SE

Inventors

• Johan Backlund · Onsala, SE
• Tomas Lock · Heby, SE

Key dates

• Filing date: Jul 20, 2018
• Grant date: Nov 3, 2020
• Expiry date: Jun 3, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/25
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Provided is an apparatus that includes a high energy beam configured to make a first weld at a first position on a workpiece; at least one deflection lens configured to deflect the high energy beam so as to cause the high energy beam to make a second weld at a second position; at least one focusing lens configured to focus the high energy beam; at least one astigmatism lens; and at least one controller. The controller is configured to shape the high energy beam so that the shape of the high energy beam on the workpiece is longer in a direction parallel to a deflection direction of the high energy beam than in a direction perpendicular to the deflection direction of the high energy beam. A length ratio is varying as a function of the power of the energy beam, while the width in the perpendicular direction is constant.