Process of producing a boom part as well as a boom and a boom part or boom produced therewith

A process of producing a boom part from a sheet metal blank,

• wherein the sheet metal blank has three successive sections, a first, a second and a third section, and the first, second and third sections each have a length and a width,
• wherein the second section is disposed substantially centrally between the first and third section in the longitudinal direction,
• wherein the width of the second section is smaller than the width of the first and third sections,
• wherein the length of the second portion is smaller than the length of the first and third sections, and
• wherein the first and third sections have lateral portions protruding widthwise beyond the second section;
• and
• the process of producing the boom part comprises the following steps:
• a) bending the lateral portions of the first and third sections about a line parallel to the longitudinal direction to form a U-shaped profile;
• and
• b) bending the second section about a line parallel to the width direction so that the bent lateral portions of the first and third sections face each other to form a hollow profile.