Trumpf Laser Gmbh

Spi Lasers UK Limited

Daniel Anthony Capostagno

Malcolm Paul Varnham

Jacek Tadeusz Gabzdyl

Paul Martin Harrison

Stephen Roy Norman

Adam Piotr Rosowski

Tara Murphy

Malcolm Paul Vamham

A weld () between a first material () and a second material (), the first material () being a first metallic material, and the second material () being a second metallic material, the weld () has a width () between 0.5 mm and 7 mm, the weld () comprises at least one microweld (), the microweld () forms a welding pattern () defined parallel to a surface () of the first material (), and the microweld () has a characteristic feature size () of between 20 μm and 400 um.

Method for laser microwelding

Apparatus for laser welding a first metal part () to a second metal part (), which apparatus comprises: a laser () which emits a laser beam () in the form of laser pulses (), a scanner () for moving the laser beam () with respect to a metal surface () of the first metal part (), an objective lens () which focuses the laser beam () onto the metal surface (), and a controller () which controls the scanner () such that it moves the laser beam () with respect to the metal surface () to a plurality of focussed spots (), characterised in that the apparatus focuses the laser pulses () with a spot size () and a pulse fluence () that causes the formation of a plurality of melt pools () in the first metal part () and heat stakes () in the second metal part (), each heat stake () extends from a different one of the melt pools () and has a distal end (), and the controller () spaces the focussed spots () apart by a distance () that is small enough to cause the melt pools () to overlap and that is large enough to ensure the distal ends () of the heat stakes () are distinct and separate from each other in at least one direction ().

Apparatus and method for overlap laser welding

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Santa Clara, CA, United States of America

Daniel Anthony Capostagno