ENHANCED FRICTION-STIR-WELDING JOINT STRENGTH BETWEEN STEEL AND ALUMINUM WITH SURFACE COATING AND PREFORMED LOCAL TEXTURE

摘要

A method and device for enhancing friction-stir-welding joint strength between aluminum and steel that has a surface coating by forming a local texture of points of raised elevation on the steel by stamping the steel, and then mechanically intermixing the steel and the aluminum with friction-stir-welding to form the joint.

主权项

1. A method for enhancing friction-stir-welding joint strength between a steel plate and an aluminum plate comprising:
providing an aluminum plate and a steel plate; coating a surface of the steel plate with a layer of zinc, aluminum, and silicon; stamping at least a portion of the surface of the steel plate comprising the surface coating to produce the preformed local texture formed of points of raised elevation in the at least the portion of the steel plate; and friction-stir-welding to form the joint, wherein the friction-stir-welding comprises:
placing the steel plate in contact with the aluminum plate;generating heat between a friction-stir-weld tool and the steel plate and the aluminum plate to form a softening of each of the metal plates near the friction-stir-weld tool;applying, via the friction-stir-weld tool, mechanical pressure to the softened metals; andmechanically intermixing the steel plate and the aluminum plate to form the joint between them, the surface coating and the preformed local texture of the steel plate residing therewithin.