| 摘要 |
PURPOSE:To improve the quality of welding by disposing a backing metal so as to form a gap between it and stocks to be rolled. CONSTITUTION:In a T-type joint of stocks 1, 2 to be welded, made of Al or Al alloy, a backing metal 3 is disposed so as to form gaps 4, 5 respectively. After attaching the metal 3 by tack welding 6, one side welding is performed to form a weld metal 7. At that time, the metal 7 melts the metal 3 between the stocks 1, 2 through the gaps 4, 5. Accordingly, notches are hardly produced at respective contacting points 8, 9 between the stocks 1, 2 and the metal 7. Therefore, fine cracks due to the welding are not generated. In this way, the strength and fatigue strength of the welded part are improved, and the welding quality is also improved.
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