PROCESS FOR SPOT WELDING WITH ADDITION OF MATERIAL

Abstract

A process for spot welding with addition of material to join metal sheets which comprises a process of spot welding that uses material deposited on one of the sheets with the welding interface between the areas of sheet to be joined, in order to avoid marks or indentation, with the surface cavities caused by the welding process, so that they are invisible after welding, surface treatment or painting; the process includes making the deposition of the material before welding on one of the sheets with any welding processes or also use of any additive manufacturing processes.

Claims

1. A process for spot welding with addition material consisting of making the deposition of material in the place corresponding to welding, on the inner face of one of the sheets, with any welding processes, before spot welding.

2. Process for spot welding with addition material, according to claim 1, characterized by optionally the addition of material can be effected by any additive manufacturing processes.

3. Process for spot welding with additional material, according to claim 1, characterized by the fact that the area, thickness and composition of the material deposited on one of the sheets are specified in accordance with the base material to be welded.

Description

DESCRIPTION OF THE DRAWINGS

[0024] To complement the present description to obtain a better understanding of the characteristics of the present invention and according to a preferential practical realization of it, accompanies the description, in annex, a set of drawings, where, in an exemplified way, although not limiting if it represented the following:

[0025] FIG. 1Shows an isometric view of a sheet that received the material before welding.

[0026] FIG. 2Shows a view in lateral perspective of a sheet that received the material before welding.

[0027] FIG. 3Shows an isometric view of two sheets prepared for welding, where one of the sheets can be seen with the added material.

[0028] FIG. 4Shows a side view of two sheets moments before they are subjected to the welding process with addition of material.

[0029] FIG. 5Shows a perspective view of the electrodes, whose geometries of the contact faces are planned or special, used in the process for spot weld with addition of material.

DETAILED DESCRIPTION OF THE INVENTION

[0030] In accordance with the figures listed above, the object of this invention, conceives a process of resistance spot welding (1) which uses material (2) deposited on one of the sheets (3) as a welding interface between the areas of sheet (3) to be joined in order to avoid marks or indentation, such as surface cavities caused by the welding process, so that they are invisible after welding, surface treatment or painting.

[0031] The case (1) comprises in, before spot welding, deposition the material (2) at the place corresponding to welding on the inner face (3A) of one of the sheets (3) with any welding processes, or optionally also use any additive manufacturing processes.

[0032] The area, thickness and composition of the material deposited (2) on one of the sheets (3) are specified in accordance with the base material to be welded. The equipment for welding and the same used in spot weld by traditional RSW, however, the contact terminals or electrodes (4) that make pressure over the areas of the sheets (3) to be welded, instead of having the rounded contact faces, now have totally flat contact faces (5) and or contact geometry special.

[0033] The chemical compositions of the deposited materials (2) are compatible with the properties of the sheets (3) to be welded.

[0034] During the melting process, the deposited material (2) melts and dilutes together with the base material, the metal sheets (3) opposed. The deposited material (2) has chemical and physical properties compatible with the properties of the sheets base metallic.

[0035] It is certain that when the present invent if put into practice, modifications may be made to certain details of construction and form, without this implying departing from the fundamental principles which are clearly substantiated in the framework claimed. It is thus understood that the terminology used had the purpose of description and not limitation.