The process of spot welding of galvanized steel sheet and process performance
Publish Time: 2016-10-13 Origin: Site
Used in automobile and home appliances industry has a variety of galvanized steel sheet, depending on the components of the zinc plating, galvanized, electric galvanized, hot galvanized sheet, board, 64 $64 $13 alloy cladding S8 alloy cladding plate, etc.At present, for galvanized steel spot welding at home and abroad can be summarized as mainly from three aspects to consider: one is from the performance of galvanized steel material itself (such as the thickness of the zinc coating, its composition, morphology and surface state, etc.) on the properties of spot welding process and solder joints;2 from the welding of galvanized steel spot welding process parameters, the influence of the spot welding equipment (control);Adopted by the third from the spot welding electrode material, the influence of electrode shape.
Including the welding industry system of galvanized steel sheet welding problems for research.Mainly divided into the following several aspects: to compare the countless coated steel, steel plate, galvanized steel and hot dip galvanized alloy steel plate change law of nucleus formation and growth process, and compares all kinds of galvanized steel under different coating thickness required for welding current range, research shows that: under the same plating thickness, electric galvanized steel welding current is needed for the biggest, galvanized steel, hot dipped alloy steel plate welding current minimum required.Coating is studied with the mutual influence between the electrode head: because when welding the different coating material at different levels and alloying between electrode reaction, the electrode wear rate, and degree of wear and tear associated with melting point, resistance of the coating and welding current.Found by a large number of experiments: nickel galvanized steel plate electrode wear is the slowest, followed by diffusion galvanized and electric galvanized steel, galvanized steel electrode wear is the most serious.
For spot welding of galvanized steel, some people think that it is necessary to adopt large electrode pressure, so that the zinc from melt extrusion nuclear area, but on the other hand, electrode pressure is too high, can also lead to excessive indentation, protect the surface zinc will be squeezed out entirely, and therefore the fount of corrosion pit in the future.In fact, most modern welding technology is based on the microcomputer controlled welding, and adopts solid-state contactor (SCRs), so that it can make the welding process becomes more accurate and reasonable.