Patent ID: 8448835

Claim:
Welding crane for welding large structures, the welding crane comprising a base part which is arranged to be positioned on a ground; a mast with a longitudinal axis, wherein the mast's longitudinal axis can be arranged in at least a first position to extend substantially vertically from the base part; a first member arranged on the mast, the first member displaceable along the mast's longitudinal axis, the first member arranged to run in a track on the mast; and a boom with a longitudinal axis, the boom is arranged on the mast, the boom's longitudinal axis can be arranged in at least a first position substantially perpendicular to the mast's longitudinal axis, and the boom arranged for receiving a welding head in a first end; a second member, wherein the boom is arranged on the second member, the second member rotatably arranged in relation to the first member, such that the second member is rotatable in relation to the first member and in relation to the mast, wherein said rotation of the second member in relation to the first member and in relation to the mast provides rotation of the boom in relation to the mast; wherein rotation of the second member in relation to the first member and in relation to the mast causes a rotation of the boom relative to the mast's longitudinal axis, wherein the boom is rotatable in relation to the mast such that the boom can be rotated to a second position in which the boom's longitudinal axis is substantially parallel with the mast's longitudinal axis; and wherein the crane further comprises support wheels positioned on a distal end of the mast, the support wheels configured to support the mast when the boom is in the second position and the mast is rotated so that the longitudinal axis of the mast is parallel with an upper surface of the base part.