METHOD AND DEVICE FOR PREPARING ALUMINIUM-COATED STEEL SHEETS INTENDED FOR BEING WELDED AND THEN HARDENED UNDER A PRESSCORRESPONDING WELDED BLANK

摘要

The present invention relates to a method for manufacturing plates intended for manufacturing a steel weld blank, said method comprising the following successive steps: a steel substrate 25 , 26 and a layer of aluminum, aluminum-alloy or aluminum-based metal ( At least one first precoated steel sheet 11 and one consisting of a precoat 15, 16 made of an intermetallic alloy layer 17, 18 in contact with the steel substrate, mounted on top of the 19, 20 providing a second precoated steel sheet (12) of The plate (12) comprises at least one first precoated steel plate (11) and one second surface (12) comprising a major face (121), an opposing major face (122), and at least one secondary face (72). providing a precoated steel sheet (12); Thereafter, with a clearance 31 of 0.02 to 2 mm between the secondary surfaces 71 and 72 arranged to face each other, moving the first plate 11 and the second plate 12 closer to each other, The fact of moving the first plate 11 and the second plate 12 together defines an intermediate plane 51 perpendicular to the major faces of the plates 11 , 12 , the first plate 11 and the second plate 12 . moving the two plates 12 closer to each other; Then, simultaneously by melting and evaporation, on the main surface 111 and on the main surface 121 , the metal alloy layer 19 in the peripheral region 61 of the plate 11 , and the peripheral region 62 of the plate 12 . removing a metal alloy layer (20) from removing the metal alloy layer 19 in the peripheral region 61 of the plate 11 and the metal alloy layer 20 in the peripheral region 62 of the plate 12 . The invention also relates to a welding blank and an apparatus for manufacturing such welding blanks.