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Plasma arc-stirring friction composition welding method

A plasma arc and friction stir technology, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of low welding efficiency and complicated process

Inactive Publication Date: 2006-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of complex process and low welding efficiency in the existing methods, and propose a plasma arc-friction stir composite welding method, which can realize reliable connection of metal materials and non-metal materials, and can ensure welding quality. Can improve welding efficiency again, and this invention process is simple, is easy to realize

Method used

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  • Plasma arc-stirring friction composition welding method

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specific Embodiment approach 1

[0009] Specific implementation mode one: as figure 1 As shown, the present embodiment welds the workpiece according to the following steps: the workpiece 3 to be welded is fixed on the workbench by a clamp, the plasma gun 2 is set on the advancing direction of the stirring head 1 as an auxiliary heating heat source, the stirring head 1 and the plasma gun 2 Fixed on the same frame, so that the plasma gun 2 cooperates with the stirring head 1 to move forward at the same time, the heat generated by the plasma arc formed by the plasma gun makes the workpiece 3 to be welded fully preheated before the stirring head 1 passes, and the plasma gun 2 and the stirring head The position between the heads 1 and the distance from the surface of the workpiece 3 to be welded can be adjusted through the preheating temperature setting and detection device 5 . During welding, the stirring head 1 rotates at high speed under the drive of the motor and presses into the workpiece 3 to be welded along...

specific Embodiment approach 2

[0012] Specific embodiment two: In this embodiment, 2219-T6 aluminum alloy is used as the material to be welded, the sample size is 300mm×100mm×5mm, and the joint form is butt joint. A tapered threaded stirring head is used, the diameter of the stirring head shaft shoulder is 14mm, and the length of the stirring needle is 4.8mm. A DC plasma arc was used as the auxiliary heat source, the distance from the plasma gun to the stirring head was 15mm, the plasma arc current was 5A, and the arc length was 5mm. Under this preheating condition, the rotation speed of the stirring head is 800rpm, and when the welding speed is up to 400mm / min, there is no welding defect in the joint. The welding process of copper alloy and magnesium alloy is similar to that of aluminum alloy.

[0013] In the absence of an auxiliary heat source, when the rotation speed of the stirring head is 800rpm and the welding speed exceeds 200mm / min, void defects appear in the weld due to the ineffective plasticizat...

specific Embodiment approach 3

[0014] Specific implementation mode three: In this implementation mode, LF6 aluminum alloy is used as the welding material, the sample size is 300mm×100mm×8mm, and the joint form is butt joint. A tapered threaded stirring head is used, the diameter of the stirring head shaft shoulder is 25mm, and the length of the stirring needle is 7.8mm. A DC plasma arc was used as the auxiliary heat source, the distance from the plasma gun to the stirring head was 12mm, the plasma arc current was 10A, and the arc length was 5mm. Under this preheating condition, when the rotation speed of the stirring head is 1000rpm, and the welding speed is up to 150mm / min, there is no welding defect in the joint.

[0015] In the absence of an auxiliary heat source, when the rotation speed of the stirring head is 1000rpm and the welding speed exceeds 50mm / min, the connection cannot be realized because the materials to be joined cannot be effectively plasticized.

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Abstract

The present invention relates to composite plasma arc-stirring friction welding method in the field of welding technology and aims at simplifying welding process and raising welding efficiency. The present invention has plasma gun as auxiliary heat source to preheat the workpiece to be welded with its plasma arc. During welding, the stirring head driven with motor for high speed rotation is pressed to the workpiece to be butt welded along the butt jointing plane to realize welding through the platicizing of the welded area under the common action of the friction heat and the plasma arc and to form welding seam in the back of the stirring head. The said method can realize the reliable connection between metal material and non-metal material in high welding quality and high welding efficiency.

Description

Technical field: [0001] The invention belongs to the field of welding, and in particular relates to a plasma arc-friction-stir composite welding method. Background technique: [0002] The basic principle of friction stir welding is as described in the patent US 5,460,317. During the friction stir welding process, the heat generated by the friction between the high-speed rotating stirring head and the workpiece is used to locally plasticize the welded material. When the stirring head moves forward along the welding interface At this time, the plasticized material moves from the front of the stirring head to the rear under the rotating friction of the stirring head, and forms a dense solid-phase weld under the extrusion of the stirring head. Joining materials include metals and their alloys, composite materials, plastics, and more. Although the method of friction stir welding can achieve effective connection of materials within a certain range, when it comes to the connection...

Claims

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Application Information

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IPC IPC(8): B23K28/02
Inventor 刘会杰冯吉才陈迎春
Owner HARBIN INST OF TECH