Method and device for centering and temporary fixation of tube parts

A method for centering and temporary fixation of tube parts relative to each other before a joint welding operation of the tube parts to one another, where a first tube part (1) comprises a first interior surface (2), a first exterior surface (3) and a first tube part end (4), and a second tube part (5) comprises a second interior surface (6), a second exterior surface (7) and a second tube part end (8), the method comprising:

• a. centering a first tool (9) relative to the interior surface (2) of the first tube part (1),
• b. centering a second tool (10) in relation to the first tool (9),
• c. fixing the first tube part (1) at its exterior surface (3) with the second tool (10), whereby said tube part (1) thereby is fixed and centered relative to the second tool (10),
• d. removing the first tool (9) from the first tube part (1),
• e. repeating steps a-d in the same way for the second tube part (5), and
• f. both second tools (10), arranged at respective first and second tube part (1, 5), are centered relative to each other and are connected, whereby the tube parts (1, 5) will be centered relative to each other with respect to the interior surfaces (2, 6), and further fixed with a predetermined distance between respective tube part end (4, 8).

A device for centering and temporary fixation of tube parts in relation to each other before a joint welding operation of tube parts to one another, where a first tube part (1) comprises a first interior surface (2), a first exterior surface (3) and a first tube part end (4), and a second tube part (5) comprises a second interior surface (6), a second exterior surface (7) and a second tube part end (8), and the device comprises a first tool (9) which is arranged to be centered relative to a tube part interior surface (2, 6) by that the first tool (9) comprises centering means (13), which are radially adjustable relative to a center axis (14) of the first tool, and the centering means (13) of the first tool (9) are insertable in the tube part (1, 5),

• wherein a second tool (10) is arranged to be centered relative to the first tool (9), by that the first tool (9) comprises at least one first guide (15) and the second tool (10) comprises at least one second guide (16), which guides (15, 16) cooperates for centering of the tools (9, 10) relative to one another, and the second tool (10) further comprises fixing means (17), which are arranged to fix the exterior surface (3, 7) of the tube part (1, 5) to the second tool (10), and
• the device comprises at least one third guide (18) which centers two, substantially equal, second tools (10) relative to one another in their mounted position on respective first and second tube part end (4, 8), and at least one coupling member (19), which is arranged to connect the two second tools (10) when they are arranged on respective first and second tube part end (4, 8).