Friction-stir welding method and friction-stir welding system

A technology of friction stir and welding methods, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of affecting control accuracy, welding pressure, and inability to ensure high-quality welding, etc., to achieve good weld formation, Guarantee the effect of welding seam forming and accurate measurement

Pending Publication Date: 2019-07-23
CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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Problems solved by technology

[0004] However, the existing robotic friction stir welding method based on constant pressure control still has certain deficiencies: (1) welding pressure is only one of the mechanical parameters that can reflect the welding quality, and a single constant pressure control method cannot guarantee high-quality welding
(2) When welding at all positions in space, due to the difference in welding posture, no matter where the mechanical sensor is installed, it will affect the measured welding pressure, thus affecting the accuracy of control

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  • Friction-stir welding method and friction-stir welding system

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Embodiment 1

[0080] This embodiment provides a friction stir welding method, the inclination angle of the workpiece is 30 degrees, and the welding process includes the following steps:

[0081] (1) Stirring head pressure calibration: extract the pressure value Pz monitored by the multi-dimensional mechanical sensor, and calibrate the actual pressure P on the stirring head according to this pressure value, P=Pz-G×sinθ. Among them, G is the sum of the gravity of the main shaft, tool handle and stirring head, θ is the angle between the axis of the stirring head and the horizontal plane at this time is equal to 30 degrees, and the workpiece is located above the stirring head, that is, θ=π / 6.

[0082] (2) Calibration of the forward resistance of the stirring head: extract the resistance value Fx of the multi-dimensional mechanical sensor in the welding forward direction, and calibrate the actual forward resistance F of the stirring head according to this resistance value, F=Px+GF cosθ. Among th...

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Abstract

The invention provides a friction-stir welding method and a friction-stir welding system, and relates to the technical field of friction-stir welding. The friction-stir welding method comprises the steps of calibration of the pressure of a stirring head, positioning before welding, path planning, welding penetration, welding pressure-maintaining, and the like. According to the friction-stir welding method, the pressure actually borne by the stirring head is calibrated without a special calibration tool, so that mechanical information is measured more accurately in the welding process, and accordingly, good weld formation is ensured. According to the friction-stir welding system, a multi-dimensional sensor which can measure the pressure, advancing resistance and torque of the stirring headis adopted, the pressure and advancing resistance are calibrated through a control system, and the constant-pressure, constant advancing resistance or constant torque is controlled through the controlsystem. According to the friction-stir welding method and the friction-stir welding system, the structure is compact, the degree of integration is high, and the mechanical information can be measuredmore accurately in the welding process.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, in particular to a friction stir welding method and a friction stir welding system. Background technique [0002] Friction stir welding is a solid-phase joining technology. When welding low-melting point metals, it has significant advantages such as high welding quality, small welding deformation, and no environmental pollution. It has become the preferred process for welding aluminum, magnesium and other alloys in various industries. In the context of the rapid development of the processing and manufacturing industry towards intelligence, it has become a future development trend to combine friction stir welding with industrial robots and develop intelligent friction stir welding robots. [0003] However, compared with the conventional friction stir welding machine, the friction stir welding robot has lower rigidity, and the mechanical arm will deform elastically under a large weldi...

Claims

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Application Information

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IPC IPC(8): B23K20/12
CPCB23K20/122B23K20/1245
Inventor 赵运强董春林王春桂易耀勇邓军谭锦红辛杨桂苗澍
Owner CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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