| 摘要 |
An internal clamp for holding securely the adjacent ends of two pipe sections or similar hollow details which are to be welded together, is applicable on land or on pipe-laying ships with laser welding devices. It has two supporting cylinders, each of which can be inserted in one of the pipe ends. Each supporting cylinder has outwardly expandable clamps. A hollow arbor carries the supporting cylinders, which are spaced some distance apart. The arbor is free to rotate relatively to the cylinders and has a window in line with the space between he clamp support cylinders, so that a laser beam can be projected through it and form a complete internal joint whilst the arbor turns through 360 degrees. The clamp can hold two adjacent pipe sections and if necessary bring them into contact. At the same time it has sufficient power to expand both sections to the same dimension and alignment so that a good welded joint can be made. |
