Electrode system for improving performances of steel-aluminum dissimilar metal resistance spot welding head
A technology of dissimilar metals and electrode systems, applied in resistance welding equipment, welding media, welding equipment, etc., can solve the problems of deterioration of mechanical properties of welded joints, intermetallic compounds, easy cracks, etc., and improve the interface structure and bonding form of joints. , the effect of reducing the degree of atomic diffusion and reducing the growth rate
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[0043] Example 1:
[0044] An electrode system for improving the performance of steel-aluminum dissimilar metal spot welding joints, wherein the positive electrode is a ring electrode, and the negative electrode is a flat electrode. Their overall appearance is a cylindrical structure, and the diameter of the end face The electrode end face of the flat electrode is a flat end face, and the end face of the ring electrode has an outer annular groove and an inner circular groove. The diameter of the spot welding electrode is 20mm, and the diameter of the spherical surface is 50mm. The distance from the axis to the flat end face is and Each position has an annular groove with a depth of 200um and a width of 0.8mm. Diameter of the central cone 6
[0045] During spot welding, the positive electrode contacts the surface of the aluminum plate, and the negative electrode contacts the surface of the high-strength steel, resulting in small indentations. At this time, the spot wel...
Example Embodiment
[0048] Example 2:
[0049] The same as Example 1, the difference is that the positive electrode 4 adopts a traditional ball electrode, and the negative electrode 3 adopts a flat-end electrode, spot welding 1.2mm 6061 aluminum alloy + 1.2mm galvanized dual-phase steel, and the nugget after welding with the same heat input The diameter of 5 reaches 6.9 mm. Compared with the ring electrode of Comparative Example 1, there are more pore defects in the center of the nugget 5.
[0050] Figure 7 As shown, the ball-electrode welded joint IMC consists of a non-uniform iron-aluminum compound near the steel side and acicular compounds near the aluminum side. Its thickness is less than 3 μm.
Example Embodiment
[0051] Example 3:
[0052] Same as Example 2, the positive electrode 4 is a traditional ball electrode, and the negative electrode 3 is a flat-end electrode, spot welding 1.2mm 6061 aluminum alloy + 1.2mm galvanized dual-phase steel, and adjusting the welding parameters to obtain the same nugget diameter as Example 1.
[0053] Table 1 shows the comparison of the tensile shear properties (N) and fracture mode of the joint obtained by using the traditional ball electrode and the electrode with an annular groove on the ball end surface of the present invention (the data in Table 1 is the average value of multiple tests).
[0054] Table 1 Comparison of tensile shear properties (N) and fracture modes
[0055] Nugget diameter (mm) Tensile shear performance (N) fracture mode ball electrode 7.4 4647 interface fracture Ring electrode 7.4 5270 broken button
[0056] As shown in Table 1, under the same nugget diameter, the tensile shear strength of ...
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