Resistance spot welding method and resistance spot welding apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKoki Nakada, Kyosuke Izuno
Life of this patent
Estimating the term…
Abstract
A resistance spot welding method includes the steps of: removing at least part of oil on a surface of a welding target material by energization between a pair of electrodes; and after the oil removal step, forming a nugget in an overlapped portion of the welding target material by energization between the pair of electrodes.
Claims13
A resistance spot welding method, in which a welding target material including a plurality of metal members overlapping each other is joined by being sandwiched between a pair of electrodes and energized with the electrodes, a surface of the welding target material facing the electrode being provided with oil, the method comprising the steps of:
- removing at least part of the oil on the surface by energization between the pair of electrodes;
- and
- after the oil removal step, forming a nugget in an overlapped portion of the welding target material by energization between the pair of electrodes, wherein
- a changing pattern of a current value in the removing at least part of the oil on the surface more gradually increases over a first period of time compared to an increasing pattern of a current value in the forming the nugget over a second period of time.
A resistance spot welding apparatus, comprising:
- a pair of electrodes that sandwich therebetween a welding target material including a plurality of metal members overlapping each other;
- and
- a controller that controls energization of the pair of electrodes,
- wherein the controller performs the control such that the pair of electrodes is energized at a current value for removing at least part of oil provided on a surface of the welding target material that faces the electrode and then also energized at a current value for forming a nugget in an overlapped portion of the welding target material;
- and
- wherein the controller performs the control such that a changing pattern of the current value in the removing at least part of the oil on the surface more gradually increases over a first period of time compared to an increasing pattern of the current value in the forming the nugget over a second period of time.
Dependencies are inferred from the claim text.