Cross resistance welding process for heterogeneous wires

Abstract

The invention discloses a cross resistance welding process for heterogeneous wires. The process is as follows: various different combinations of current and pressure are adopted; in a first pulse, large electrode pressure and small welding current are adopted; contact resistance between a small electrode and a welded wire is reduced so as to reduce electrode adhesion; and the contact area is increased to reduce splashing. In a second pulse, small electrode pressure and large welding current are adopted; a heat production proportion of the contact resistance is increased, so that a non-equilibrium heat production phenomenon at a combined surface can be relieved, thereby generating plenty of molten metal on the combined surface, filling grooves generated because of structural factors, and increasing joint strength. The cross resistance welding process has the technical effects that: the process is suitable for cross resistance welding for heterogeneous wires, especially easy-to-melt materials can wet spread-out heterogeneous material combination on a difficult-to-melt material surface; and the process can realize efficient connection of heterogeneous wires, avoids a special tool required by other welding methods, reduces the welding cost and greatly improves the welding efficiency.

Description

technical field [0001] The invention relates to a cross resistance welding process of dissimilar wires, in particular, it is suitable for cross resistance welding of dissimilar wires in which fusible materials can wet and spread on the surface of refractory materials. Background technique [0002] Resistance welding is to form a nugget at the part to be welded to realize the connection through the resistance heat generated inside the workpiece. During the welding process, the upper and lower electrodes exert a certain pressure on the workpiece to be welded, and the welding current passes through the weldment, using resistance heat to melt the base metal and form a connection. In resistance welding, lap joints are generally used, such as sheet-to-sheet, wire-to-wire, or wire-to-sheet connections. For the wire-to-wire connection, the form of cross wires is often used, which is mainly used for electrical interconnection in electronic or medical devices, such as: sensors, relay...

AI Technical Summary

Problems solved by technology

However, when the cross wire is resistance welded under the hard specification, the wire has a large cold deformation, the contact area increases, the heat production decreases, the actual connection area becomes smaller, and the joint strength is also very small

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