Welding method of galvanized steel sheet
A technology of galvanized steel sheets and welding methods, applied in welding equipment, welding/welding/cutting items, resistance welding equipment, etc., can solve the problems of reducing labor productivity and achieve the effect of reducing spot welding bumps
Active Publication Date: 2018-10-19
SAIC VOLKSWAGEN AUTOMOTIVE CO LTD
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Problems solved by technology
However, solder joint polishing requires a lot of manpower and material resources, which seriously reduces labor productivity
Method used
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[0026] Through experiments, the applicant found that there is a direct relationship between the generation of spot welding bumps on the galvanized steel sheet and the welding time. The longer the soldering time, the larger the protrusion of the spot welding bump and the more uneven the surface. The shorter the welding time, the smaller the protrusion of the spot welding bump and the smoother the surface. The generation of spot welding bumps has little to do with the size of the welding current, and the size of the welding current does not significantly affect the flatness of the spot welding bumps. Therefore, spot welding bumps on galvanized steel sheets are very sensitive to welding time. According to the heat input formula Q=I 2 Rt shows that high current for short time and low current for long time can get the same heat input, and because the current is a square relationship, increasing the current can significantly reduce the welding time. Based on the characteristics t...
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Abstract
The invention discloses a welding method for galvanized steel plates. The welding method includes a pre-pressing step, a preheating step, a pre-cooling step, a climbing welding step, a stable welding step and a cooling step. The pre-pressing step is to apply a galvanized steel plate to be welded and apply a preloading pressure to the solder joint by a welding electrode. The preheating step includes that the welding electrode is connected to the preheating current and continuously heats, while the welding electrode applies welding pressure to the solder joint. The pre-cooling step includes cutting off current of the welding electrode while preserving welding pressure of the welding electrode, and the pre-cooling step is continued for the pre-cooling time. The climbing welding step includes that the welding electrode is connected with the climbing current and lasts for the climbing time, while applying welding pressure to the solder point, and the climbing current gradually increases to the final current from the initial current within the climbing time. The stable welding step includes that the welding electrode maintains the final current and lasts for the stable time, while applying the welding pressure to the solder point. The cooling step includes cutting off the current of the welding electrode but maintaining the welding pressure of the welding electrode until the nugget cools down to be the crystal.
Description
technical field [0001] The invention relates to the technical field of automobile manufacturing, more specifically, to the welding technology of automobile steel plates. Background technique [0002] In recent years, the corrosion resistance of automobiles has become more and more stringent. Traditional cold-rolled steel sheets can no longer meet this demand. Galvanized steel sheets are increasingly subject to corrosion because of their dense galvanized layer on the surface. More and more car manufacturers use it. [0003] In the manufacturing process of automobiles, extensive use of welding technology is required to weld steel plates. Compared with traditional uncoated cold-rolled steel sheets, galvanized steel sheets have an impact on the welding process due to the presence of a galvanized layer on the surface. Due to the low melting point of zinc, zinc melts before the steel plate when energized and heated to form a zinc ring around the nugget. The zinc ring has a shunt...
Claims
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IPC IPC(8): B23K11/11B23K11/34
CPCB23K11/11B23K11/34B23K2101/006B23K2101/34B23K2103/04
Inventor 高云峰张正林王阳王辰
Owner SAIC VOLKSWAGEN AUTOMOTIVE CO LTD