Device is for guiding and transferring 2 sheet blanks (2,3) previously placed side-by-side in order to form a joining plane (4), esp. in a continuous welding installation. It incorporates two assemblies (20,60) for supporting and transferring the sheet blanks (2,3) in the direction of high intensity energy beam (1), each arranged either side of the joining plane (4) and displaceable in synchronisation with each other. Each support and transfer assembly (20,60) comprises 1 lower series of carriages or 1 upper series of carriages. These carriages are articulated in a vertical plane and can be displaced in a direction parallel to the joining plane (4) on a rolling track forming a reference plane and each supporting 1 pattern that can be displaced w.r.t. the carriages perpendicular to the joining plane (4) of the sheet blanks (2,3). The patterns of 1 of the two series of carriages co-operate with some means of laterally pressing the edges of the sheet blanks to be welded by displacement of the patterns perpendicular to the joining plane (4) of the sheet blanks (2,3).
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