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A Welding Method for Reducing Porosity in Fusion Welding of Die Casting Magnesium Alloy

A welding method and fusion welding technology, applied in welding/welding/cutting items, welding equipment, welding medium, etc., can solve the problem of less research on porosity reduction/elimination measures, and achieve low implementation cost, improved welding quality, and convenient operation. Effect

Inactive Publication Date: 2016-05-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Less research has been done on porosity reduction / elimination measures, and no effective solution to the porosity problem has been identified

Method used

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  • A Welding Method for Reducing Porosity in Fusion Welding of Die Casting Magnesium Alloy
  • A Welding Method for Reducing Porosity in Fusion Welding of Die Casting Magnesium Alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Based on the above specific implementation method, the welding wire material selected is an extruded AZ61 magnesium alloy for welding. The specific composition of the welding wire is as follows: Al6.45%, Zn0.80%, Si0.07%, Mn0.24%, and the balance is Mg. Two weld cross-sections obtained by intercepting typical parts of the weld after welding are shown in figure 2 As shown in (a) and (b), there are more bubbles and poor welding quality.

Embodiment 2

[0026] Example 2: Based on the above specific implementation method, the selected welding wire material is an extruded AZ61 magnesium alloy, mixed with a small amount of neodymium-rich rare earth elements, and the specific components of the welding wire are taken in the following mass percentages: Al6.37%, Zn0.7 %, Si0.04%, Mn0.15%, Nd1.00%, La0.2%, and the balance is Mg. Two weld cross-sections obtained by intercepting typical parts of the weld after welding are shown in figure 2 As shown in (c) and (d), the porosity is reduced relative to (a) and (b), and the welding quality is improved.

Embodiment 3

[0027] Example 3: Based on the above specific implementation method, the selected welding wire material is an extruded AZ61 magnesium alloy mixed with a small amount of neodymium-rich rare earth elements. The specific components of the welding wire are the following mass percentages: Al6.26%, Zn0.73 %, Si0.06%, Mn0.26%, Nd2.00%, La0.4%, and the balance is Mg. Two weld cross-sections obtained by intercepting typical parts of the weld after welding are shown in figure 2 As shown in (e) and (f), the porosity is reduced again relative to figures (c) and (d), and the welding quality is further improved.

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Abstract

The invention discloses a welding method for reducing the porosity in the melting welding of a die-cast magnesium alloy. The welding method is characterized in that a magnesium alloy welding wire mixed with a small quantity of neodymium-rich rare earth elements is adopted for welding during the melting welding of the die-cast magnesium alloy, so that the rare earth and part hydrogen from a stable hydride because of the chemical affinity with the hydrogen during the welding, then the hydrogen porosity of a welding joint is reduced; the solubility of the hydrogen in the magnesium is increased because of the rare earth, so that the part of the hydrogen element is dissolved in the magnesium in a solid form, and then the hydrogen porosity of the welding joint is reduced; in addition, the mobility of a molten bath is increased because of the rear earth element, so that the gases like hydrogen and nitrogen are more rapidly overflowed, and then the porosity of the welding joint is reduced. The welding method can well reduce the influences of the gases in the die-cast magnesium alloy on the welding, the problem of the porosity during the welding of the die-cast magnesium alloy is solved, the welding quality is improved, and meanwhile, the welding method has the advantages of simple and convenient operation, low implementation cost and the like.

Description

technical field [0001] The magnesium alloy welding technology of the present invention particularly relates to a welding method for reducing the welding porosity of the die-casting magnesium alloy. Background technique [0002] Due to the advantages of low density, high specific strength and specific stiffness, good damping and vibration reduction performance, and good die-casting and machining process performance, magnesium alloys have good application prospects in automobiles, aerospace, handheld tools and 3C products. Magnesium alloys are mainly divided into two categories: wrought magnesium alloys and cast magnesium alloys. At present, magnesium alloy parts are mainly formed by die castings, and die castings account for more than 90% of commercial magnesium alloys. Due to the limitations of the inherent process characteristics of the die-casting process, the magnesium alloy die-casting has a high internal gas content, and the main components of the gas are hydrogen and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02B23K35/28
CPCB23K31/02B23K35/284B23K2103/08
Inventor 游国强杜娟赵旭李阳马小黎
Owner CHONGQING UNIV
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