Tungsten pole inert gas protection electric arc welding preheating stirring friction welding composite method

A tungsten inert gas, friction stir welding technology, used in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of low welding speed, reduced welding quality, and reduced high temperature strength of the stirring head, so as to improve welding quality, The effect of good weld formation and increased welding speed

Inactive Publication Date: 2005-10-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Its disadvantages are: the back of the workpiece joint needs to have a baffle or fixture sufficient to withstand the pressure of the stirring head; the welding speed is low; The effect will make the grains become narrow and long; the uneven grain size distribution of welded joints is also related to the distribution of frictional heat during welding
When the pressure of the stirring head is small and the amount of the stirring head is not pressed enough, the frictional heat generation will be insufficient, so that enough plastic fluid material cannot be produced, the material flow is not sufficient, and it cannot rotate and move around the stirring head well, and cannot completely Filling the gap in the lower layer will easily form holes at the botto

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Fix the clean deformed magnesium alloy AZ31B with a thickness of 1.6mm (the sample size is 300×100×1.6mm, the weld joint type is: butt joint, I-shaped groove, and the backing plate is a copper plate) weldment on the clamping mechanism ;

[0023] Determine the following process parameters according to the material and thickness of the weldment: the inclination angle of the stirring head (the angle between the center line of the stirring head and the straight line perpendicular to the weld seam clockwise) is 0°; the welding current is AC 30A; the tungsten inert gas shielded welding torch and the stirring head The welding speed is 600mm / min; the welding torch angle (the angle between the welding torch and the plane where the weld is located) is 50°; the rotation speed of the stirring head is 600r / min; the shielding gas is argon; the argon flow rate is 5L / min ; The diameter of the tungsten electrode is 0.8mm; the distance between the tungsten inert gas shielded torch and th...

Embodiment 2

[0027] (1) Fix the clean deformed magnesium alloy AZ31B with a thickness of 3.6mm (the sample size is 300×100×3.6mm, the weld joint type is: lap joint, I-shaped groove, and the backing plate is carbon steel plate) weldment on the clamping mechanism;

[0028] (2) Determine the following process parameters according to the material and thickness of the weldment: the inclination angle of the stirring head (the angle between the center line of the stirring head and the line perpendicular to the weld line clockwise) is 2°; the welding current is AC 115A; the tungsten inert gas shielded welding torch The welding speed with the stirring head is 340mm / min; the angle of the welding torch (the angle between the welding torch and the plane where the weld is located) is 65°; the rotation speed of the stirring head is 1200r / min; the shielding gas is argon; the flow rate of argon is 10L / min; the diameter of the tungsten electrode is 1.6mm; the distance between the tungsten inert gas shielde...

Embodiment 3

[0032](1) Fix the clean deformed magnesium alloy AZ31B with a thickness of 8mm (the sample size is 300×100×8mm, the weld joint type is: fillet joint, I-shaped groove, and the backing plate is copper plate) weldment on the clamping Institutional;

[0033] (2) Determine the following process parameters according to the material and thickness of the weldment: the inclination angle of the stirring head (the angle between the center line of the stirring head and the straight line perpendicular to the weld) is 5°; the welding current is AC 200A; the tungsten inert gas shielded welding torch The welding speed with the stirring head is 80mm / min; the angle of the welding torch (the angle between the welding torch and the plane where the welding seam is located) is 80°; the rotation speed of the stirring head is 1800r / min; the shielding gas is argon; the flow rate of argon is 15L / min; the diameter of the tungsten electrode is 2.2mm; the distance between the tungsten inert gas shielded t...

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PUM

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Abstract

A combined welding method consisting of TIGarc welding for preheating and stirring friction welding features that the welding gun of TIG arc welding is fixed to a slide rod connected to the stirring head of stirring friction welding, and they are arranged in the front of the seam to be welded. After the TIG arc welding is applied for preheating, the stirring friction welding is conducted under pressing, so resulting in high speed and quality.

Description

technical field [0001] The invention relates to a welding method used in the field of welding technology, in particular to a tungsten inert gas shielded arc welding preheating-friction stir welding composite method. Background technique [0002] There are a series of difficulties in welding aluminum alloy, magnesium alloy and some other non-ferrous metals, mainly manifested in: strong oxidation ability; high thermal conductivity, easy to produce pores, cracks, large deformation and other defects during welding; alloy elements are easy to burn loss etc. Due to welding heating, the performance of the metal to be welded is reduced, which greatly limits its application in structures such as aircraft and ships. [0003] After searching the literature of the prior art, it was found that "AZ31 magnesium alloy friction stir welding joint nugget area" published by Zhang Hua et al. Forming process and influencing factors[J]”, which introduces the method of friction stir welding: tha...

Claims

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Application Information

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IPC IPC(8): B23K28/02
Inventor 丁文斌蒋海燕曾小勤姚寿山丁文江吴国松
Owner SHANGHAI JIAO TONG UNIV
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