Pulse welding method

Abstract

The invention discloses a pulse welding method, wherein the welding current waveform is cycled an repeated in periodicity. A unit period waveform is composed of a Gaussian wave strong pulse set and a rectangular wave weak pulse set, wherein a Gaussian function modulation mode of the Gaussian wave strong pulse set is divided into a Gaussian wave pulse peak value modulation and Gaussian wave pulse basic value modulation. In the unit period waveform, the time of basic value currents of the Gaussian wave strong pulse is equal, and the time of all peak value currents of the Gaussian wave pulse is equal. During the Gaussian wave pulse peak value modulation, magnitude and duration time of the basic value currents of the Gaussian wave pulse in the unit period waveform are equal, the magnitude of the peak currents is modulated according to a Gaussian function, and the time of the peak value currents is equal. During the Gaussian wave pulse basic value modulation, magnitude and duration time of the peak value currents of the Gaussian wave pulse in the unit period waveform are equal, the magnitude of the basic currents is modulated according to a Gaussian function, and the time of the basic value currents is equal. The welding method is capable of concentrating energy, good in controllability, and particularly suitable for welding sheet aluminum alloy.

Description

technical field [0001] The invention belongs to the field of welding research, and in particular relates to a pulse welding method, which is especially suitable for welding aluminum-magnesium alloy materials. Background technique [0002] Green manufacturing is a sustainable development model of modern manufacturing, and a modern manufacturing model that comprehensively considers environmental factors and resource consumption. Lightweight, tough, and precise are the development trends of today's manufacturing industry. In this context, aluminum alloy materials are more and more used in the fields of automobiles, ships, aerospace and other fields due to their excellent comprehensive properties such as light weight, wear resistance and corrosion resistance, good impact resistance, and recyclability. [0003] However, during the welding process, due to the high thermal conductivity of the aluminum alloy material, there are problems such as rapid heat loss, soft material, easy ...

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Problems solved by technology

[0003] However, during the welding process, due to the high thermal conductivity of the aluminum alloy material, there are problems such as rapid heat loss, soft material, easy wire plugging, low thermal strength, and easy collapse and welding, especially the welding of thin aluminum alloys. difficulty

There are various problems in the manufacturing process of the commonly used aluminum-magnesium alloy material welding technology: such as aluminum alloy laser welding has problems such as high cost, high energy consumption, easy generation of pores, easy burning of alloy elements, and high sensitivity to cracks; Spot welding encounters difficulties such as high energy consumption, easy electrode failure, and unstable spot welding quality in the connection of aluminum alloy structural parts; due to the limitation of its principle, the thickness of the workpiece to be welded is affected by friction stir welding, and the stirring head The wear is fast, the speed is obviously lower than that of melting electrode welding, and the technology is immature. At present, it is only limited to the processing of structural parts with simple structure.

However, the double-pulse aluminum alloy welding process has strict requirements on the process parameter matching range, and the welding quality outside the range drops rapidly, especially for thin plate welding.

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