| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe laser welding method and a coil manufactured using the welding method, capable of ensuring a process welding length for a crater process and sufficiently performing the crater process when laser welding is performed on a plurality of pipes disposed to be adjacent in parallel.SOLUTION: At least one adjacent pipe adjacent to a to-be-welded pipe in parallel is disposed, and each position where the to-be-welded pipe is closest to the adjacent pipe in a joint part is defined as a closest position. Welding is performed in a predetermined laser output state clockwise and counterclockwise from a starting end near the closest position. A plurality of paths each starts from a portion near the adjacent or single closest position, a distance between a connection point where each path is connected to the facing path in the predetermined laser output state and the closest position forward in a welding progress direction is equal to or larger than a process welding length at which a crater process is performed toward a terminal end while gradually reducing a laser output.SELECTED DRAWING: Figure 1 |
