| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a laser beam tube welding method which is simple, has a well workability and easily obtains a high welding quality without requiring a special composition of a conventional heating means for closely attaching butt parts except its forming means to form a metal plate as the raw material in a tube like. SOLUTION: A tube welding is executed in a tube forming process (1) where a metal plate 1 as a raw material is formed in a tube like and its both end parts are put in the butt state same as at welding or the proximate state, a laser cutting process (2) where respective end parts are cut parallel to the welding face with a laser beam, a butt process (3) where these cutting faces are again butted, and a laser beam welding process (4) where these butt parts are welded with the laser beam.</p> |
