阅读说明：本技术 一种adc12铝合金真空电子束焊接方法 (ADC12 aluminum alloy vacuum electron beam welding method ) 是由 韦宝权 李生智 张维 祝影 张庆锋 谯永鹏 于 2019-07-25 设计创作，主要内容包括：本发明公开一种ADC12铝合金真空电子束焊接方法,包括以下步骤：第一步：对铝合金试板表面及侧面进行钢丝刷打磨；第二步：用丙酮对铝合金进行擦拭清理；第三步：将铝合金试板进行装夹,两侧给予压应力,无对接间隙,焊前预热50-100℃；第四步：送入真空焊接室,抽真空；第五步：将铝合金试板进行点固焊接；第六步：将铝合金试板进行熔化焊；第七步：对焊缝进行修饰焊；第八步：焊后充入氮气进行保护,防止氧化。本发明提出焊接方法,焊接速度高,修饰后焊道表面光亮、圆滑无缺陷。焊缝窄,变形小。无炸点,焊接过程稳定。(the invention discloses an ADC12 aluminum alloy vacuum electron beam welding method, which comprises the following steps: the first step is as follows: polishing the surface and the side surface of the aluminum alloy test plate by a steel wire brush; the second step is that: wiping and cleaning the aluminum alloy by using acetone; the third step: clamping an aluminum alloy test plate, applying compressive stress to two sides without butt joint gaps, and preheating to 50-100 ℃ before welding; the fourth step: sending into a vacuum welding chamber, and vacuumizing; the fifth step: performing point-fixing welding on the aluminum alloy test plate; and a sixth step: carrying out fusion welding on the aluminum alloy test plate; the seventh step: performing finish welding on the welding seam; eighth step: and nitrogen is filled for protection after welding to prevent oxidation. The welding method provided by the invention has the advantages of high welding speed, bright, smooth and flawless surface of the modified welding bead. The welding seam is narrow and the deformation is small. No explosive point and stable welding process.)

1. A vacuum electron beam welding method for ADC12 aluminum alloy end weld is characterized in that:

The method comprises the following steps:

the first step is as follows: polishing the surface and the side surface of the aluminum alloy test plate by a steel wire brush until the surface has bright metallic luster;

the second step is that: wiping and cleaning the aluminum alloy by using acetone;

The third step: clamping an aluminum alloy test plate, applying compressive stress to two sides of the aluminum alloy test plate to enable the aluminum alloy test plate to be completely attached without butt joint gaps, and preheating the aluminum alloy test plate to 50-100 ℃ before welding;

the fourth step: sending into a vacuum welding chamber, and vacuumizing;

the fifth step: performing point-fixing welding on the aluminum alloy test plate; the specific parameters are as follows: the acceleration voltage is 70KV, the beam current is 5mA, the welding speed is 1300mm/min, the surface focus is realized, and no scanning function graph exists;

And a sixth step: carrying out fusion welding on the aluminum alloy test plate; the specific parameters are as follows: the acceleration voltage is 120KV, the beam current is 10mA, the welding speed is 1200mm/min, the surface is burnt, the scanning function graph is elliptical, the major axis is 0.6mm along the welding direction, the minor axis is 0.2mm and is vertical to the welding direction, and the scanning frequency is 1000 HZ;

the seventh step: performing finish welding on the welding seam; the specific parameters are as follows: the acceleration voltage is 70KV, the beam current is 8mA, the welding speed is 800mm/min, the surface focus is realized, and no scanning function graph exists;

Eighth step: and nitrogen is filled for protection after welding to prevent oxidation.

2. the vacuum electron beam welding method for the ADC12 aluminum alloy end weld according to claim 1, wherein the method comprises the following steps:

Mechanically cleaning the workpiece before welding, and wiping the workpiece with acetone; the end welding seam has no butt joint clearance, and the two sides of the end welding seam give compressive stress.

3. the vacuum electron beam welding method for the ADC12 aluminum alloy end weld according to claim 1, wherein the method comprises the following steps:

After welding, cooling to below 50 ℃, and filling nitrogen.

4. the vacuum electron beam welding method for the ADC12 aluminum alloy end weld according to claim 1, wherein the method comprises the following steps:

the thickness of the plate is 2-10mm, the weld penetration is 1-1.5mm, and the modification width is 3-3.5 mm.

Technical Field

The invention relates to the field of electron beam welding processes, in particular to a vacuum electron beam welding process for an ADC12 aluminum alloy end joint welding seam.

Background

the aluminum alloy has low density and high specific strength, and is widely applied to the fields of automobiles, mechanical manufacturing, aerospace and the like. The ADC12 aluminum alloy is Al-Si-Cu series casting alloy, the forming mode is die-casting forming, the aluminum alloy is widely applied to cylinder cover caps, sensor supports, cylinder bodies and the like, and the interior is usually used for heat dissipation, so that the connection part of the aluminum alloy requires good sealing effect. Because the working environment temperature is high, the generated tensile stress is large, and the requirement on the strength of the connecting position is met.

the traditional welding processes such as TIG, MIG and the like have high heat input, non-concentrated energy, large generated deformation and severe softening of a heat affected zone. Because the solubility difference of H between liquid aluminum and solid aluminum is large, when a die casting is welded by the traditional welding method, a large number of air holes are often caused by shrinkage porosity, shrinkage cavity and the like in the material, the welding strength is low, and the surface forming is poor. The problems of welding blowholes and sunken weld bead surfaces are difficult to solve due to the fact that explosive points are often generated and the splashing is too large in the laser welding die casting process. Vacuum electron beam welding is a high-energy beam welding method, a workpiece is welded in a vacuum environment, the metal purity of a welding seam is high, contact with air and other gases is avoided, and hydrogen sources are reduced. The welding energy is concentrated, the thermal deformation is small, and the stability is good in the aluminum alloy welding process.

For the ADC12 die-casting aluminum alloy, a vacuum electron beam welding method is adopted, and a welding process is optimized, so that a high-quality welding seam which is good in forming and free of defects such as air holes and cracks can be obtained.

disclosure of Invention

The invention aims to provide an ADC12 aluminum alloy vacuum electron beam welding method. Has the advantages of small deformation, beautiful welding line formation, no crack, no air hole and other defects.

in order to achieve the purpose, the invention adopts the technical scheme that:

A vacuum electron beam welding method for ADC12 aluminum alloy end welding seams comprises the following steps:

the first step is as follows: polishing the surface and the side surface of the aluminum alloy test plate by a steel wire brush until the surface has bright metallic luster;

The second step is that: wiping and cleaning the aluminum alloy by using acetone;

the third step: clamping an aluminum alloy test plate, applying compressive stress to two sides of the aluminum alloy test plate to enable the aluminum alloy test plate to be completely attached without butt joint gaps, and preheating the aluminum alloy test plate to 50-100 ℃ before welding;

the fourth step: sending into a vacuum welding chamber, and vacuumizing;

the fifth step: performing point-fixing welding on the aluminum alloy test plate; the specific parameters are as follows: the acceleration voltage is 70KV, the beam current is 5mA, the welding speed is 1300mm/min, the surface focus is realized, and no scanning function graph exists;

and a sixth step: carrying out fusion welding on the aluminum alloy test plate; the specific parameters are as follows: the acceleration voltage is 120KV, the beam current is 10mA, the welding speed is 1200mm/min, the surface is burnt, the scanning function graph is elliptical, the major axis is 0.6mm along the welding direction, the minor axis is 0.2mm and is vertical to the welding direction, and the scanning frequency is 1000 HZ;

The seventh step: performing finish welding on the welding seam; the specific parameters are as follows: the acceleration voltage is 70KV, the beam current is 8mA, the welding speed is 800mm/min, the surface focus is realized, and no scanning function graph exists;

Eighth step: and nitrogen is filled for protection after welding to prevent oxidation.

The invention has the beneficial effects that:

the welding method provided by the invention has the advantages of high welding speed, bright, smooth and flawless surface of the modified welding bead. The welding seam is narrow and the deformation is small. No explosive point and stable welding process.

Drawings

FIG. 1 is a schematic view of the clamping of the present invention.

Detailed Description

The invention is explained in further detail with reference to fig. 1.

A vacuum electron beam welding method for ADC12 aluminum alloy end welding seams comprises the following steps:

the first step is as follows: carrying out steel wire brush polishing on the surface and the side surface of the ADC12 aluminum alloy test plate until the surface has bright metallic luster;

The second step is that: wiping and cleaning the aluminum alloy by using acetone;

The third step: clamping an ADC12 aluminum alloy test plate, applying compressive stress to two sides of the test plate to enable the test plate to be completely attached without butt joint gaps, and preheating the test plate to 50-100 ℃ before welding;

The fourth step: sending into a vacuum welding chamber, and vacuumizing;

the fifth step: performing point-fixing welding on the aluminum alloy test plate; the specific parameters are as follows: the acceleration voltage is 70KV, the beam current is 5mA, the welding speed is 1300mm/min, the surface focus is realized, and no scanning function graph exists;

and a sixth step: carrying out fusion welding on the aluminum alloy test plate; the specific parameters are as follows: the acceleration voltage is 120KV, the beam current is 10mA, the welding speed is 1200mm/min, the surface is burnt, the scanning function graph is elliptical, the major axis is 0.6mm along the welding direction, the minor axis is 0.2mm and is vertical to the welding direction, and the scanning frequency is 1000 HZ;

the seventh step: performing finish welding on the welding seam; the specific parameters are as follows: the acceleration voltage is 70KV, the beam current is 8mA, the welding speed is 800mm/min, the surface focus is realized, and no scanning function graph exists;

eighth step: and nitrogen is filled for protection after welding to prevent oxidation.

mechanically cleaning the workpiece before welding, and wiping the workpiece with acetone; the end welding seam has no butt joint clearance, and the two sides of the end welding seam give compressive stress.

after welding, cooling to below 50 ℃, and filling nitrogen.

The thickness of the plate is 2-10mm, the weld penetration is 1-1.5mm, and the modification width is 3-3.5 mm.