Oil-coated passivation film galvanized steel sheet welding process

Abstract

The invention relates to the technical field of galvanized steel sheet welding, in particular to an oil-coated passivation film galvanized steel sheet welding process. Oil-coated passivation film galvanized steel sheets are welded through a resistance spot welding mode; and equipment and parameters thereof during resistance spot welding are that a welding machine is a single-phase rectification type direct-current spot welding machine, an electrode is made of a Cr-Zr-Cu alloy, the diameter range of the end face of an electrode is 5-7 mm, the welding current range is 9.7-11.0 kA, the time rangeof each time of spot welding is 1-1.8 s, and the electrode pressure range is 2.5-3.5 kN. By the adoption of the resistance electric welding process, the nugget diameter of each spot-welded joint ranges from 3.1-4.5 mm, a nugget of each spot-welded joint meets the standard requirement, the shear resistance of each spot-welded joint is detected, the shear resistance of each spot-welded joint is larger than 2.0 kN, the shear resistance is better, the welding effect is remarkably improved, and welding of the large-scale oil-coated passivation film galvanized steel sheets is facilitated.

Description

technical field [0001] The invention relates to the technical field of welding between galvanized steel sheets, in particular to a welding process between galvanized steel sheets with an oil-coated passivation film. Background technique [0002] Hot-dip galvanized steel sheets are widely used in machinery manufacturing, construction, and home appliances. However, the galvanized layer still has corrosion and rust in humid environments. An effective way to solve this problem is to passivate the galvanized layer. At present, the common passivation treatment of galvanized steel sheet is to process a layer of oil-coated passivation film on its surface to form an oil-coated passivation film galvanized steel sheet. Oil is a commonly used lubricating oil, mainly composed of base oil and additives. Composition, the oil-coated passivation film layer has good corrosion resistance. The welding between oil-coated galvanized steel sheets is usually manual arc full welding. Since there is...

AI Technical Summary

Problems solved by technology

The welding between oil-coated galvanized steel sheets is usually manual arc full welding. Since there is a layer of oil-coated passivation film on the surface of oil-coated galvanized steel sheets, the surface of oil-coated galvanized steel sheets The zinc layer has a very low melting point and low hardness, which brings certain difficulties to welding between oil-coated passive film galvanized steel sheets, poor welding effect, and low welding efficiency, which is not conducive to large-scale oil-coated passive film galvanized steel sheets. welding