A method for laser welding first and second components is provided including moving a laser beam across a portion of a surface of the first component at a speed sufficient to generate protuberances on the surface of the first component by means of a humping effect, juxtaposing said first and second components such that opposed surfaces of the first and second components are separated by said protuberances on the surface of the first component, and laser welding said first and second components by scanning the laser beam in a region in which said surfaces are separated by said protuberances. The height of the protuberances can be controlled by controlling a scanning speed of the laser beam.

Laser-based lap welding of sheet metal components using laser induced protuberances to control gap

The invention discloses a synchronous regulation and control method for the F/A ratio of a bimetal penetration laser welding multi-layer structure. The method is characterized in that a laser weldingprocess is adopted for performing penetration welding on a layered bi-metal workpiece to be welded; and in the laser welding process of the layered bimetal workpiece to be welded, an auxiliary heat source is applied behind a laser beam, and the synchronous optimization of a laser weld microstructure is realized under the heat action of the auxiliary heat source. In the laser welding process of a layered bimetal material, the auxiliary heat source is applied behind the laser beam, and a thermal cycle in the welding process is changed through the reheating effect of the heat source in order to make the weld multilayer DSS structure keep in an austenite transformation temperature interval for more time, so that the austenite content is increased. A weld dual-phase steel side is subjected to synchronous structure optimization, so that a structure becoming unbalanced due to the decrease in the austenite content gets close to the balance ratio of (1 to 1) again.

Synchronous regulation and control method for F/A ratio of bimetal penetration laser welding multi-layer structure

The invention discloses a non-bevelling laser and arc combined welding method of a medium-thickness plate, relates to the field of welding, and aims to solve the problems that in a traditional weldingmanner, a relatively large welding groove needs to be bevelled, more filler wires are needed, welding thermal input is relatively high, relatively large welding deformation is liable to form, besides, welding efficiency is low, quality is poor, welding spatter of laser arc composite welding is severe, and welding formation is poor. According to the non-bevelling laser and arc combined welding method, cracks of mother boards are welded firstly through laser welding and then through arc operation, besides, a certain laser wire distance exists between laser and arcs, and laser emitted by a laserand arcs emitted by a welding gun do not act in one molten pool. The non-bevelling laser and arc combined welding method is used for welding the medium-thickness plate.

Non-bevelling laser and arc combined welding method of medium-thickness plate

Le procede est destine au soudage de deux plaques (12) d'epaisseurs (E) superieures a 8 mm, et presentant des bords lateraux de soudure (12C) paralleles entre eux. Le cordon de soudure est realise au moyen d'un outil de soudage hybride (24) comportant : un emetteur laser (26) emettant un laser (28) le long d'un axe d'emission (A), avec un point focal (36) dispose dans l'epaisseur des plaques, et une torche de soudage MAG (29), comportant une buse (30) de diffusion de gaz et au moins un fil d'apport (32) s'etendant jusqu'a une extremite libre (34). En considerant un plan de projection parallele aux surfaces superieures (12A), la projection orthogonale du point focal (36) et la projection orthogonale de l'extremite libre (34) du fil d'apport (32) sur ce plan de projection sont espacees d'une distance (D) superieure ou egale a 15 mm.

Procede optimise de soudage hybride laser-arc

Such a process comprises the following steps: an upper metal component (1) is positioned on a lower metal component (2), superposing them at least in a welding zone; a plurality of projections (5) is produced on the lower face (6) of the upper metal component (1) facing the lower metal component (2) by means of a laser pulse applied at discrete points on said upper metal component (1), said projections (5) being spaced apart and spacing the upper metal component (1) away from the lower metal component (2); the two metal components (1, 2) are welded together in the welding zone by means of the laser beam.

Laser welding process for welding metal components, producing a plurality of projections by means of a laser at the interface between the components

The design of the Litz wire has a strong influence on the performance on wireless power transfer systems. The number and arrangement of the bundles are important factors, whose influence on the distribution has so far been complex to study. This paper presents a new method to easily analyse the current distribution in the Litz wire as a function of these factors. The effect of frequency on the observed phenomena will be explored in simulations and validated experimentally. 

/pdf/higher-winding-efficiency-in-the-wpt-system-thanks-to-1443qgrp.pdf

Higher winding efficiency in the WPT system thanks to homogeneous current distribution in the litz wire

The development of LBW processes is driven by more complex laser-based welding processes made possible with the development of lasers of higher available power. Nevertheless, most laser-heads are based on refractive optics, limiting the capability to fully use this power. Multi-Plane Light Conversion (MPLC) is a fully reflective technology enabling complex beam shaping through a succession of phase plates. A MPLC-based laser head has been developed providing an annular shape. It presents a less than a 1mm focus shift. LBW as well as HLAW of steal up to 16kW is demonstrated with improved butt-joint configuration gap welds. 

MPLC-based laser head providing a 800μm diameter annular shape to improve hybrid laser-arc welding of steal up to 16kW

The laser technology is key to the development of the e-mobility. We demonstrate how an optimal laser beam shaping enables high speed and high quality copper welding for the battery cells manufacturing. The beam shaping parameters are explored and optimized and the optical performance is assessed. The process window is described for four sets of shape parameters as well as the comparison with an unshaped beam. The quality in each cases for different speed and average power is discussed. An optimal process at 6m/min and 8kW is obtained. At last, different welding configuration, such as transparent welding, are described. 

An optimal tailored beam-shape to improve copper welding with a 1µm 8kW laser

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