Diffusion welding process and device for joining sheet metal...

B - Operations – Transporting – 21 – D

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B21D 39/03 (2006.01)

Patent

CA 2257251

In a diffusion welding process for joining superimposed sheet metal parts by welding, part of the material of the metal sheets is locally upset by means of a stamp and a die perpendicularly to the plane of the metal sheets, causing the material of the sheet metal parts to yield and diffusion welding the sheet metal parts at a weld. In order to achieve a sufficiently solid weld even when the parts to be joined are made of materials with a particular tendency to hardening at low temperatures or pre-hardened materials, the parts of the metal sheet surrounding the weld are pressed onto the die during welding with a force which is sufficient to prevent the material from yielding against the active direction of the stamp.

Selon ce procédé de soudage par diffusion utile pour joindre des pièces superposées en tôles métalliques, on refoule perpendiculairement au plan des tôles métalliques une partie du matériau dont sont constituées les tôles métalliques au moyen d'un poinçon et d'une matrice, de façon à provoquer le fluage du matériau et à souder par diffusion les tôles métalliques au niveau d'une soudure. Afin de réaliser une soudure suffisamment solide même lorsque les pièces à joindre sont constituées de matériaux qui tendent fortement à se consolider à froid ou de matériaux consolidés au préalable, pendant que l'on joigne les tôles on presse sur la matrice les parties des tôles situées autour de la soudure avec une force suffisante pour empêcher le matériau de fluer en sens contraire à la direction de sollicitation du poinçon.

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