Al-Mg-Er welding wire and preparation process thereof

Abstract

The invention discloses an Al-Mg-Er welding wire and a preparation process thereof. The Al-Mg-Er welding wire mainly comprises the following chemical components in percentage by mass: 4.3 to 6.5 percent of Mg, 0.4 to1.2 percent of Mn, 0.05 to 1.3 percent of Zr, 0.1 to 0.6 percent of Er and the balance of Al and other inevitable impurities. The preparation method comprises: preparing pure aluminum ingots, pure magnesium ingots, Al-Mn(10.0) preliminary alloy, Al-Er (0.6) preliminary alloy and Al-Zr (4.5) preliminary alloy; melting the alloys in a mixing ratio in a medium frequency induction electric resistance furnace and performing casting to make a cast ingot; subjecting the homogenized cast ingot to end cutting and face milling and hot extrusion; and after intermediate annealing, performing wire drawing in a wire drawing machine while performing pass annealing, subjecting the wire drawn to surface treatment, and coiling the wire to obtain the Al-Mg-Er welding wire of the invention. The welding wire of the invention has the advantages that: the smelting process is stable and easy to implement and the drawing performance of the welding wire is high; the obvious refining molding performance of the structure of the welding wire is high, the strength of weld joint metal is guaranteed and that the plasticity of weld joint metal is equal to that of a parent metal is guaranteed; and the impurity content of the Al-Mg-Er welding wire is low, the toughness is improved, the solution strengthening of an aluminum substrate is promoted, and the strength of the weld joint metal is improved effectively.

Description

technical field [0001] The invention relates to an aluminum alloy welding wire for welding, in particular to a welding wire used for fusion welding of Al-Mg alloys and a preparation process thereof. Background technique [0002] At present, one direction of aluminum alloy research is to add trace rare earth elements to aluminum alloy to improve the strength of the alloy and obtain better comprehensive properties. In recent years, many scholars have studied the effect of rare earth element Er on aluminum and aluminum alloys. Xu Guofu et al. found that adding Er to Al-Zn-Mg alloy can significantly refine the grains of the cast alloy, and Er can be precipitated by dispersion. Er can also inhibit the recrystallization behavior of the alloy (XU Guo-fu, MOU Shen-zhou, NIE Zuo-ren and YINZhi-min, Effect of trace rare earth element Er on Al-Zn-Mg alloy [J]. Trans. Nonferrous Met. Soc. China, 2006, 16(1): 598-603). Yang Junjun and others added trace amounts of Er to pure aluminum, ...

AI Technical Summary

Problems solved by technology

However, increasing the Mg content in Al-Mg based solder alloys causes a drastic decrease in corrosion resistance

However, there are no relevant reports at home and abroad on the research on the use of Er-containing Al-Mg alloys for the preparation of welding wire materials.