A method of fitting a flange to a tubular section , the method comprising: rotating the tubular section supported on a plurality of tube rollers toward a joining unit ; the method being characterised by the following steps: rotating at least one portion of the flange toward the joining unit ; receiving one or more signals indicative of a radial offset between the tubular section and the at least one portion of the flange moving toward the joining unit in the rotation direction , the radial offset corresponding to a shift in radial position of the at least one portion of the flange and at least one portion of the tubular section relative to one another, and the rotation direction being a direction of rotation, e.g., clockwise or counterclockwise, of the circumference of the tubular section about the center axis defined by the tubular section , comparing the one or more signals indicative of the radial offset to a target value; and based at least in part on the comparison of the one or more signals to the target value, adjusting the radial offset between the at least one portion of the flange and the tubular section as the at least one portion of the flange and the tubular section are rotated in the same rotational direction, e.g., clockwise or counterclockwise, to move these components toward the joining unit . rotating the tubular section supported on a plurality of tube rollers toward a joining unit ; the method being characterised by the following steps: rotating at least one portion of the flange toward the joining unit ; receiving one or more signals indicative of a radial offset between the tubular section and the at least one portion of the flange moving toward the joining unit in the rotation direction , the radial offset corresponding to a shift in radial position of the at least one portion of the flange and at least one portion of the tubular section relative to one another, and the rotation direction being a direction of rotation, e.g., clockwise or counterclockwise, of the circumference of the tubular section about the center axis defined by the tubular section , comparing the one or more signals indicative of the radial offset to a target value; and based at least in part on the comparison of the one or more signals to the target value, adjusting the radial offset between the at least one portion of the flange and the tubular section as the at least one portion of the flange and the tubular section are rotated in the same rotational direction, e.g., clockwise or counterclockwise, to move these components toward the joining unit . rotating at least one portion of the flange toward the joining unit ; receiving one or more signals indicative of a radial offset between the tubular section and the at least one portion of the flange moving toward the joining unit in the rotation direction , the radial offset corresponding to a shift in radial position of the at least one portion of the flange and at least one portion of the tubular section relative to one another, and the rotation direction being a direction of rotation, e.g., clockwise or counterclockwise, of the circumference of the tubular section about the center axis defined by the tubular section , comparing the one or more signals indicative of the radial offset to a target value; and based at least in part on the comparison of the one or more signals to the target value, adjusting the radial offset between the at least one portion of the flange and the tubular section as the at least one portion of the flange and the tubular section are rotated in the same rotational direction, e.g., clockwise or counterclockwise, to move these components toward the joining unit . <EOS>