WELDING EQUIPMENT FOR METALLIC MATERIALS AND METHOD FOR WELDING METALLIC MATERIALS
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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 sandwiches metallic materials with a pair of electrodes, and heats different regions of the metallic materials by energization, with the pair of electrodes maintained at the same position with respect to the metallic materials. The welding equipment includes a first heating means connected to the pair of electrodes 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 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 for independently controlling the first and the second heating means.
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Citations
21 Claims
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1-9. -9. (canceled)
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10. :
- A method for spot-welding metallic materials by sandwiching the metallic materials with a pair of electrodes and energizing the metallic materials, comprising;
a first step for heating and spot-welding a given region of the metallic materials by a first energization applying electric power having a low frequency or DC 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 applying electric power having a high frequency 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)
- A method for spot-welding metallic materials by sandwiching the metallic materials with a pair of electrodes and energizing the metallic materials, comprising;
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15. :
- A method for spot-welding metallic materials, comprising;
a first step for sandwiching the metallic materials with a pair of electrodes; a second step for heating and spot-welding a given region of the metallic materials by applying electric power for welding to the pair of electrodes; and a third step for heating the welded given region of the metallic materials or a region different from the given region which should be welded by applying electric power having a high-frequency to the pair of electrodes, wherein the heating time in the second step and that in the third step are independently controlled.
- A method for spot-welding metallic materials, comprising;
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16. :
- A method for spot-welding metallic materials, comprising;
sandwiching the metallic materials with a pair of electrodes; a welding step for heating and spot-welding a given region of the metallic materials by applying electric power for welding to the pair of electrodes; and a heat-treating step for heating the welded given region of the metallic materials or a region different from the given region which should be welded by applying electric power having a high frequency to the pair of electrodes, wherein the heating time in the welding and that in the heat treating step are independently controlled, and wherein a heating time and a power of the high frequency are controlled. - View Dependent Claims (17)
- A method for spot-welding metallic materials, comprising;
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18. :
- A method for spot-welding metallic materials, comprising;
sandwiching the metallic materials with a pair of electrodes; a pre-heating step for pre-heating a region different from a given region which should be welded by applying electric power having a high frequency to the pair of electrodes; and a welding step for spot-welding a given region of the metallic materials by applying electric power for welding to the pair of electrodes, wherein the heating time in the pre-heating step and that in the welding step are independently controlled. - View Dependent Claims (19, 20)
- A method for spot-welding metallic materials, comprising;
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21. :
- A method for spot-welding metallic materials, comprising;
sandwiching the metallic materials with a pair of electrodes; a welding step for heating a given region of the metallic materials which should be welded by applying electric power for welding to the pair of electrodes; and a heating step for heating a region different from the region in of the metallic materials which should be welded by applying electric power having a high frequency to the pair of electrodes, wherein the heating time in the welding step and that in the heating are independently controlled, and wherein the electric power for welding is applied to the pair of electrodes and the high-frequency power is superimposed to the pair of electrodes by controlling the heating time and the power.
- A method for spot-welding metallic materials, comprising;
Specification