Method powder with melting heating of the area adjacent the bath

The invention relates to a method of manufacturing a workpiece comprising the steps of: (a) providing a powdered particulate material (60), (b) heating a first quantity of this powder to a temperature higher than its melting temperature TF with a high energy beam (95), and forming on the surface of a support (80) a first bath comprising the molten powder and a portion of said support (80), (c) itself is heated a second quantity of the powder, and is formed to the support surface (80) a second bath comprising the molten powder downstream of the first bath, (d) repeating step (c) to form a first layer (10) of the workpiece on the support (80), (e) even heating a [n] th amount of the powder, and forming a [n] th bath comprising the molten powder over a portion of the first layer (10), (f) of same is heated a [n + 1] th amount of the powder, and forming a [n + 1] th bath comprising this downstream molten powder [n] th bath, (g) repeating step (f) to form a second layer (20) of the part above the first layer (10 ), (h) repeating steps (e) through (g) for each powder layer located above a layer of powder which has already been formed until said part is substantially in its final form. At least during the formation of each of the baths (102), an auxiliary heater is used to heat the material located in an area adjacent to the bath (102), said zone comprising at least one region selected from the upstream region (101) located upstream of the bath (102) and the downstream region (103) located downstream of the bath (102) at a temperature below the melting temperature TF.