Laser and variable polarity plasma hybrid welding method for magnesium alloy with medium thickness

A hybrid welding and plasma welding technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems that magnesium alloy plate welding cannot be applied

Active Publication Date: 2015-11-11
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only suitable for magnesium alloy plates with a small thickness, ...

Method used

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  • Laser and variable polarity plasma hybrid welding method for magnesium alloy with medium thickness

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Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, the laser-variable polarity plasma hybrid welding method of the medium-thickness magnesium alloy of the present embodiment comprises the following steps:

[0025] (1) The thickness of the magnesium alloy plate a to be welded is 10 mm, butt the adjacent two magnesium alloy plates to be welded, and the gap between the two magnesium alloy plates after the butt joint is 1 mm;

[0026] (2) Under the protection of argon gas with a purity of 99.99%, align the above gap for welding; during welding, the laser beam b and the polarity-changing plasma arc c are located on the same side of the weld, and the polarity-changing plasma arc c is in the welding direction Located on the front side of the laser beam b, the distance L between the action point of variable polarity plasma welding and the action point of laser welding is 4mm;

[0027] Single-sided non-groove welding is adopted, the flow rate of argon gas is 15L / min, the current and time of variable p...

Embodiment 2

[0029] Such as figure 1 As shown, the laser-variable polarity plasma hybrid welding method of the medium-thickness magnesium alloy of the present embodiment comprises the following steps:

[0030] (1) The thickness of the magnesium alloy plate a to be welded is 25mm, and two adjacent magnesium alloy plates to be welded are butted, and the gap between the two magnesium alloy plates after the butt joint is 1mm;

[0031] (2) Under the protection of the mixed gas of argon and helium, aim at the above-mentioned gap for welding, the volume ratio of argon and helium is 1:1; during welding, the laser beam b and the variable polarity plasma arc c are located at the welding position The seam is on the same side, and the variable polarity plasma arc c is located on the front side of the laser beam b in the welding direction, and the distance L between the action point of the variable polarity plasma welding and the action point of the laser welding is 5mm;

[0032] Single-sided non-groo...

Embodiment 3

[0034] Such as figure 1 As shown, the laser-variable polarity plasma hybrid welding method of the medium-thickness magnesium alloy of the present embodiment comprises the following steps:

[0035] (1) The thickness of the magnesium alloy plate a to be welded is 30mm, butt the adjacent two magnesium alloy plates to be welded, and the gap between the two magnesium alloy plates after the butt joint is 2mm;

[0036] (2) Under the protection of the mixed gas of argon and helium, aim at the above-mentioned gap for welding, the volume ratio of argon and helium is 1.5:1; when welding, the laser beam b and the variable polarity plasma arc c are located at the welding position seam on the same side, and the variable polarity plasma arc c is located in front of the laser beam b in the welding direction, and the distance L between the action point of the variable polarity plasma welding and the action point of the laser welding is 6mm;

[0037] Double-sided non-groove welding is adopted,...

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Abstract

The invention relates to a laser and variable polarity plasma hybrid welding method for a magnesium alloy with a medium thickness. A laser and variable polarity plasma hybrid welding technology is adopted, variable polarity plasma welding is located on the front side of laser welding in the welding direction, the variable polarity plasma welding and the laser welding are conducted simultaneously, and a proper distance is kept between action points of the variable polarity plasma welding and the laser welding, so that welding of magnesium alloy sheets with the medium thickness is achieved; when the thickness of the magnesium alloy sheets is smaller than 25 mm, welding from one side without beveling is adopted, and the magnesium alloy sheets are completely welded in one time, the time is greatly saved, and the welding efficiency is improved; when the thickness of the magnesium alloy sheets is larger than 26 mm, welding from both sides without the beveling is adopted, and a gas mixture of argon gas and helium gas is used as protective gas to increase the depth of fusion, so that welding can be completed efficiently, and a weld joint with well formed surface and without undercuts is obtained. By means of the laser and variable polarity plasma hybrid welding method for the magnesium alloy with the medium thickness, the quality of the interior and the exterior of the weld joint can reach grade II or above grade II, and the joint strength can reach more than 0.80 of base materials.

Description

technical field [0001] The invention relates to the field of welding technology, and specifically refers to a laser-polarity variable plasma composite welding method for medium-thickness magnesium alloys. The method is mainly suitable for welding magnesium alloys with a thickness of 10 mm to 50 mm. Background technique [0002] Welding technology is an indispensable key manufacturing technology in the modern manufacturing industry, and has penetrated into various production fields of the modern machinery manufacturing industry. High quality and high efficiency have become a sign to measure whether a welding method and welding process are excellent. [0003] Magnesium alloys are widely used in the fields of transportation, aerospace, and national defense because of their advantages such as low density, high specific strength, and easy machining; with the urgent need for lightweight, parts made of magnesium alloys can achieve significant weight loss effect. However, in order...

Claims

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Application Information

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IPC IPC(8): B23K26/348
CPCB23K26/348
Inventor 马志华陈东亮马冰李娜陈东高明珠冯胜强刘红伟杨武林任宝辉郭海林
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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