| 摘要 |
The invention relates to a method for preparing sheets intended for manufacturing a steel welded blank, which comprises the following consecutive steps: providing at least one first (11) and one second (12) pre-coated steel sheets, made up of a steel substrate (25, 26), and a pre-coating (15, 16) made of an intermetallic alloy layer (17, 18) in contact with said steel substrate, mounted on top of a aluminium, aluminium-alloy or aluminium-based metal layer (19, 20), the sheet (11) comprising a main surface (111), an opposing main surface (112), and at least one secondary surface (71), the sheet (12) comprising a main surface (121), an opposing main surface (122), and at least one secondary surface (72); then moving the first (11) and second (12) sheets close together, leaving a clearance (31) of 0.02 to 2 mm between the secondary surfaces (71) and (72) placed facing one another, the fact of moving the first (11) and second sheets (12) together defining a median plane (51) perpendicular to the main surfaces of the sheets (11) and (12); and then simultaneously removing by melting and vaporisation, on the main surface (111) and the main surface (121), the layer of metal alloy (19) in a peripheral area (61) of the sheet (11), and the layer of metal alloy (20) in a peripheral area (62) of the sheet (12), the peripheral areas (61) and (62) being the areas of the main surfaces (111) and (121) that are closest to said median plane (51) located on either side of same. The invention also relates to a welded blank and to a device for manufacturing such welded blanks. |
