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Magnesium aluminum alloy welding method

A welding method, magnesium-aluminum alloy technology, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve problems such as large welding deformation, incomplete penetration, and growth of metal internal grains, and achieve a solution Porosity and inclusion problems, internal porosity and inclusion elimination, and the effect of improving comprehensive mechanical properties

Active Publication Date: 2015-03-11
WUXI FUMEI LIGHT ALLOY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these industrial applications, it is often encountered that magnesium-aluminum alloy parts need to be welded. Due to the particularity of magnesium-aluminum alloy itself, when aluminum-magnesium alloys are welded, due to the faster heat conduction of aluminum-magnesium alloys, the heat loss during welding is relatively small. Fast, the weld pool often has defects such as infusion, incomplete penetration, pores and cracks due to insufficient heat; and after welding, natural cooling is used, and a large amount of heat accumulates in the workpiece and cannot be dissipated immediately, resulting in the growth of the internal grains of the metal. The strength of the metal is reduced more
On the other hand, a large amount of heat input makes the weldment stay at high temperature for a long time, resulting in large welding deformation, which directly affects the quality of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step: clean the welding area on the surface of the aluminum-magnesium alloy plate to be welded, and prepare a 50°C solution containing 8% NaOH (fire alkali) and 40% HNO 3 (nitric acid) solution; immerse the parts to be welded in NaOH (caustic soda) for 10 minutes. An appropriate amount of NaOH can be added at any time to make the PH value reach the specified value; after removing the parts from the alkaline solution, rinse them with cold water. Remove NaOH (caustic soda) residues on the surface of the workpiece, and soak the cleaned parts in nitric acid solution for 30s. Use pH test paper to test the concentration of nitric acid before each batch of rinsing. The pH value should be 1. If the pH value is not as specified, you can add an appropriate amount of nitric acid at any time to make the pH value reach the specified value; take the parts out of the nitric acid solution and put them in water. Cleaning, removing nitric acid residues on the surface of the wo...

Embodiment 2

[0032] The first step: clean the welding area on the surface of the aluminum-magnesium alloy plate to be welded, and prepare a 55°C solution containing 9% NaOH (caustic soda) and 45% HNO 3 (nitric acid) solution; soak the parts to be welded in NaOH (caustic soda) for 15 minutes. An appropriate amount of NaOH can be added at any time to make the PH value reach the specified value; after removing the parts from the alkaline solution, rinse them with cold water. Remove NaOH (caustic soda) residues on the surface of the workpiece, and soak the cleaned parts in nitric acid solution for 45s. Use pH test paper to test the concentration of nitric acid before each batch of rinsing. The pH value should be 1. If the pH value is not as specified, you can add an appropriate amount of nitric acid at any time to make the pH value reach the specified value; take the parts out of the nitric acid solution and put them in water. Cleaning, removing nitric acid residues on the surface of the work...

Embodiment 3

[0042] The first step: clean the welding area on the surface of the aluminum-magnesium alloy plate to be welded, and prepare a 60°C solution containing 10% NaOH (fire alkali) and 50% HNO 3 (nitric acid) solution; soak the parts to be welded in NaOH (fire soda) for 20 minutes. An appropriate amount of NaOH can be added at any time to make the PH value reach the specified value; after removing the parts from the alkaline solution, rinse them with cold water. Remove NaOH (caustic soda) residues on the surface of the workpiece, and soak the cleaned parts in nitric acid solution for 60s. Use pH test paper to test the concentration of nitric acid before each batch of rinsing. The pH value should be 1. If the pH value is not as specified, you can add an appropriate amount of nitric acid at any time to make the pH value reach the specified value; take the parts out of the nitric acid solution and put them in water. Cleaning, removing nitric acid residues on the surface of the workpie...

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Abstract

The invention provides a magnesium aluminum alloy welding method which comprises the following steps: cleaning a welding region on the surface of a to-be-welded magnesium aluminum alloy board; carrying out preheating treatment on the to-be-welded magnesium aluminum alloy board in the welding region; carrying out spot-welding fixed connection on the magnesium aluminum alloy board by using a metal inert-gas welding machine. The method disclosed by the invention is simple, is easy to operate, and is suitable for industrial popularization and use; the magnesium aluminum alloy board is clamped and fixed by using a foam asbestos board, so that heat preservation time of a weld pool between welding grooves of two workpieces can be long and the phenomena of incomplete fusion, incomplete penetration of air holes and cracks are difficult to generate; the magnesium aluminum alloy welding method effectively solves the problems of the air holes and blended impurities; the internal air holes and the blended impurities of a welding joint treated by the method disclosed by the invention are basically eliminated; the strengthening effect is ideal and the comprehensive mechanical performance of the material is greatly promoted; the magnesium aluminum alloy welding method is energy-saving and environmental-friendly.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a welding method for magnesium-aluminum alloy plates. Background technique [0002] Magnesium-aluminum alloy is widely used in industrial fields such as aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry due to its excellent comprehensive properties such as excellent processing performance, high strength, good plasticity, corrosion resistance and fatigue resistance. In these industrial applications, it is often necessary to weld magnesium-aluminum alloy parts. Due to the particularity of magnesium-aluminum alloy itself, when aluminum-magnesium alloys are welded, due to the faster heat conduction of aluminum-magnesium alloys, the heat loss during welding is relatively small. Fast, the weld pool often has defects such as infusion, incomplete penetration, pores and cracks due to insufficient heat; and after welding, natural cooling is used, ...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/235
CPCB23K9/173B23K9/235B23K2103/18
Inventor 魏峰丁汉林
Owner WUXI FUMEI LIGHT ALLOY TECH
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