WELDING EQUIPMENT FOR METALLIC MATERIALS AND METHOD FOR WELDING METALLIC MATERIALS
First Claim
1. Welding equipment for metallic materials, sandwiching metallic materials with the pair electrodes and heating different regions of the metallic materials by energization with the pair of electrodes maintained at the same position with respect to the metallic materials, comprising:
- a first heating means connected to a pair of electrodes for heating a given region of the metallic materials by applying electric power having a first frequency;
a second heating means connected to the pair of electrodes for heating a region of the metallic materials different from the given region by applying electric power having a second frequency; and
an energization control unit for independently controlling the first heating means and the second heating means.
1 Assignment
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Accused Products
Abstract
A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment 1 sandwiches metallic materials 9 with a pair of electrodes 4, 4, and heats different regions of the metallic materials 9 by energization, with the pair of electrodes 4, 4 maintained at the same position with respect to the metallic materials 9. The welding equipment includes a first heating means 6 connected to the pair of electrodes 4, 4 for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means 8 for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit 10 for independently controlling the first and the second heating means 6, 8.
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Citations
14 Claims
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1. Welding equipment for metallic materials, sandwiching metallic materials with the pair electrodes and heating different regions of the metallic materials by energization with the pair of electrodes maintained at the same position with respect to the metallic materials, comprising:
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a first heating means connected to a pair of electrodes for heating a given region of the metallic materials by applying electric power having a first frequency; a second heating means connected to the pair of electrodes for heating a region of the metallic materials different from the given region by applying electric power having a second frequency; and an energization control unit for independently controlling the first heating means and the second heating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for welding metallic materials by sandwiching the metallic materials with a pair of electrodes and energizing the metallic materials, comprising:
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a first step for heating a given region of the metallic materials by a first energization to the pair of electrodes; and a second step for heating a region different from the region in the first step by a second energization to the pair of electrodes performed with the pair of electrodes maintained at the same position as the first step, wherein the heating time in the first step and that in the second step are independently controlled. - View Dependent Claims (11, 12, 13, 14)
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Specification