| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of reinforcing the cylinder tube of a hydraulic cylinder and also the hydraulic cylinder, capable of making lightweight without increasing production costs and of preventing a decrease in fatigue strength at a welding part. SOLUTION: A hydraulic cylinder 1 is formed by integrating a cylinder tube 2 with a bottom member 3 by welding. Where, belt-like overlay welding 5 is applied to the outer boundary part of the cylinder tube 2 at a required zone b at a partial tube side adjacent the welding part 4. Contracting force caused at coagulation is applied to the adjacent part from the welding part 4. The resulting hydraulic cylinder is provided with a surface part from the connected boundary of the cylinder tube 2 and the bottom member 3 toward the cylinder tube 2 side and a melted, coagulated part with width, 0.07-0.25 time the outside diameter of the cylinder tube.
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