A kind of ultrasonic-assisted welding method of magnesium alloy with pure Pb as intermediate reaction material layer

Abstract

The invention discloses a magnesium-alloy ultrasound-assisted welding method by using pure Pb as an intermediate reaction material layer. Through the screening of the design conditions of the intermediate reactive material layer, the pure Pb foil is selected as the intermediate reaction material layer and is welded with the magnesium alloy; the pure Pb foil used as the intermediate reaction material layer is beneficial to reduce the welding temperature; the welding is completed in the atmosphere environment without the assisting of brazing filler metals; the welding method is green and environmentally friendly; only a small amount of brittle intermetallic compounds are produced during the welding process; and a full-Mg based solid solution joint is obtained. The welding time is short, thejoint has a high mechanical property and the welding effect is good.

Description

Technical field [0001] The invention relates to the technical field of magnesium alloy welding, in particular to a magnesium alloy ultrasonic assisted welding method with pure Pb as an intermediate reaction material layer. Background technique [0002] With the development of lightweight structures in aerospace, transportation, 3C electronics and other fields, lightweight materials such as Mg alloys and their composites have become more and more widely used, and the high-performance manufacturing of their structural parts cannot do without the support of mature welding technology. However, current welding technologies such as fusion welding, traditional brazing and transition liquid phase diffusion welding have high welding temperature (welding temperature refers to the reaction temperature of the intermediate reaction material layer), the oxide film is difficult to remove, and the base material to be welded is easy to soften Some welding techniques also need to be welded under v...

AI Technical Summary

Problems solved by technology

However, the current welding technologies such as fusion welding, traditional brazing and transitional liquid phase diffusion welding have high welding temperature (welding temperature refers to the reaction temperature of the intermediate reaction material layer), difficult to remove the oxide film, and easy softening of the base metal to be welded. Insufficient, some welding techniques still need to be welded under vacuum or protective gas. The welding time is too long, and brittle intermetallic compounds are produced during the welding process, resulting in generally low mechanical properties of the joints.

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