Spot welding method of galvanized steel sheets

A galvanized steel sheet and spot welding technology, applied in welding equipment, resistance welding equipment, manufacturing tools, etc., can solve problems such as poor welding, and achieve the effect of solving poor welding

Inactive Publication Date: 2016-01-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a spot welding method for galvanized steel sheets, which can solve the problem of poor welding caused by the above passivation film

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  • Spot welding method of galvanized steel sheets
  • Spot welding method of galvanized steel sheets
  • Spot welding method of galvanized steel sheets

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Embodiment Construction

[0015] Below in conjunction with embodiment the present invention is further described:

[0016] A method of spot welding galvanized steel sheets, comprising the following steps in sequence:

[0017] A. The two electrodes of the spot welding machine respectively press the two galvanized steel sheets to be welded;

[0018] B. Perform the first welding current output: the welding current is set to 5000-8000 amps, the discharge duration is 10-30 cycles, and the electrode pressure value is 1500-3500 N;

[0019] C. Carry out the second welding current output: the welding current is set to 7000-13000 amps, the discharge duration is 10-30 cycles, and the electrode pressure value is 1500-3500 N;

[0020] D. The two electrodes are separated from the two galvanized steel sheets, and the spot welding is completed.

[0021] In the spot welding method of the present invention, after the two electrodes of the spot welding machine are respectively pressed against two galvanized steel sheet...

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Abstract

The invention relates to a spot welding method of galvanized steel sheets. The spot welding method comprises the following sequential steps: holding down two galvanized steel sheets needing to be welded by using two electrodes of a spot welding machine, respectively; carrying out first welding current outputting: setting a welding current to the range of 5000-8000A, a discharge duration to the range of 10-30 cycles and an electrode pressure value to the range of 1500-3500N; carrying out second welding current outputting: setting the welding current to the range of 7000-13000A, the discharge duration to the range of 10-30 cycles and the electrode pressure value to the range of 1500-3500N; and separating the two electrodes from the two galvanized steel sheets and finishing spot welding. By means of the spot welding method, after the two galvanized steel sheets are held down by the electrodes of the spot welding machine, the first welding current outputting is carried out to damage an original passivation film, and then the second welding current outputting so that the two steel sheets are fused and welded at a welding point; as a result, the problem of poor welding due to the passivation film is solved.

Description

technical field [0001] The invention relates to a spot welding process, in particular to a spot welding method for galvanized steel sheets. Background technique [0002] Galvanizing is an effective way to improve the corrosion resistance of steel. Galvanized steel sheets are widely used in automobiles, home appliances, construction and other industries. The principle is that a layer of metal zinc is coated on the surface of the steel sheet. The zinc layer has good corrosion resistance after passivation treatment, so it can protect the inner steel sheet. . [0003] The early passivation process of galvanized steel sheet often adopts chromate passivation, that is, hexavalent chromium passivation. The galvanized steel sheet passivated by hexavalent chromium has good corrosion resistance, and the passive film has self-healing ability, but the six Chromium is a toxic carcinogen, so the industry has begun to use more environmentally friendly trivalent chromium passivation. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/16
CPCB23K11/11B23K11/166B23K2101/18
Inventor 余腾义李大东周磊磊邓健
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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