| 摘要 |
PROBLEM TO BE SOLVED: To weld posts within adjacent cells in a through hole with no defects by forming the tip of a welding electrode in conical trapezoid of first and second two steps, using the bottom surface of the first conical trapezoid as the top surface of the second conical trapezoid, forming the bottom angle of the second conical trapezoid in the specified range, and limiting the relation between the tip diameter of the first conical trapezoid and the through hole diameter to the specified range. SOLUTION: An electrode 8 is brought into contact with a through hole 5 through a partition wall 4 by pushing a post, and has the tip of a first conical trapezoid 7 whose diameter D is smaller than the diameter D' of the through hole 5. The post of the electrode 8 is pushed in the through hole 5 by applying the constant pressure, and since the electrode 8 follows in the expansion 1 contraction caused by temperature change in welding or by melting/solidifying of the post, an inclined part 14 serving as a wedge is formed in the electrode 8. The bottom angle 8 of a second conical trapezoid is made 5-20 deg. to ensure the sufficient pressure contact force and forging pressure action between the post and the partition wall 4. By making the tip diameter D of the electrode 8 to be 60-80% of the diameter D' of the through hole 5, blowhole is prevented, and unstable contact between adjacent posts caused by deformation producing when the post is pushed in the through hole 5 is prevented. |
