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A double tungsten electrode tig narrow gap welding method with high deposition efficiency and high welding speed

A technology of welding speed and deposition efficiency, which is applied in the field of TIG welding, can solve the problems of low deposition efficiency and slow welding speed, and achieve the effects of good forming, increased welding speed and reduced number of welding passes

Active Publication Date: 2020-03-20
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a double tungsten electrode TIG narrow gap welding method with high deposition efficiency and high welding speed. To solve the problem, a new method of double tungsten TIG with a non-axisymmetric tip rotating tungsten electrode and another conventional tungsten electrode with high deposition efficiency and high welding speed is proposed.

Method used

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  • A double tungsten electrode tig narrow gap welding method with high deposition efficiency and high welding speed
  • A double tungsten electrode tig narrow gap welding method with high deposition efficiency and high welding speed
  • A double tungsten electrode tig narrow gap welding method with high deposition efficiency and high welding speed

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Embodiment 1

[0035]A double tungsten electrode TIG narrow gap welding method with high deposition efficiency and high welding speed. The narrow gap welding of 9% Ni steel with a thickness of 26 mm and U-shaped groove in this embodiment is welded. The distance between the two tungsten electrodes and the workpiece is the same. The welding system includes two welding machines, two welding torches, welding power supply, and wire feeding device. The two welding machines are respectively connected with a rotating tungsten electrode welding torch and a stationary tungsten electrode welding torch. The two welding machines independently control welding parameters, and the two welding torches are respectively Both are connected with an attitude adjustment device, which is used to adjust the distance between the welding torches in the horizontal direction, the distance between the welding torch and the workpiece in the vertical direction, and the angle between the welding torch and the vertical directi...

Embodiment 2

[0043] A double tungsten electrode TIG narrow gap welding method with high deposition efficiency and high welding speed, its equipment and steps are as described in Embodiment 1, the difference is that in step (4), two welding torches are connected with two wire feeding devices, Implement double welding torches and double wire feeding; DC welding is adopted, and the tungsten pole of the second welding torch is rotated through the switch of the motor control box of the second welding torch before the arc is struck; when welding, the two welding torches strike the arc at the same time, and the welding current of the first welding torch is 320A, the flow rate of the shielding gas is 30L / min, the current of the second welding torch is 250A, the flow rate of the shielding gas is 30L / min, the welding speed is 400mm / min, the wire feeding speed of the first wire feeding device is 800mm / min, the second The wire feeding speed of the wire feeding device is 600mm / min.

[0044] In this emb...

Embodiment 3

[0046] A double tungsten electrode TIG narrow gap welding method with high deposition efficiency and high welding speed, the equipment and steps are as described in Embodiment 2, the difference is that in step (2), the attitude of the two welding torches is adjusted by the attitude adjustment equipment, The distance between the first welding torch and the bottom edge of the workpiece is d1, and d1 is 5mm; the distance between the second welding torch and the bottom edge of the workpiece is d2, and d2 is 5mm; the horizontal distance between the tungsten electrodes of the two welding torches is 50mm; angle is is 0°, the angle between the second welding torch and the vertical direction is β, and β is 15°.

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Abstract

The invention relates to a high-deposition efficiency and high-welding speed dual-tungsten electrode TIG (Tungsten Inert Gas) welding method for a narrow gap, and belongs to the technical field of TIGwelding. Two different welding guns: an axisymmetrical static tungsten electrode welding gun and a non-axisymmetrical rotating tungsten electrode welding gun, are employed; the welding method comprises the following steps of firstly forming a U-shaped groove in a workpiece, and performing pretreatment on the groove; arranging the two welding guns front and back in a welding direction, and adjusting a posture of each of the two welding guns; enabling distance from one of the two welding gun to the workpiece and distance from the other welding gun to the workpiece to be equal; setting each of welding machines to be in an advanced gas feed mode, centering the welding guns, setting each of wire feeding mechanisms to be in a delayed wire feed mode and an advanced wire drawing mode, and firstlyperforming advanced heating premelting on a weldment; and turning a tungsten electrode of a second welding gun by a motor control box switch of the second welding gun before arc striking, wherein direct current welding is employed. During welding, arc striking is performed on the two welding guns simultaneously for welding, and thus, the front face of a weld joint can be formed well and has no defects: undercuts and the like; welding deposition efficiency and welding speed are obviously increased, and dual-tungsten electrode TIG high-speed welding of the narrow gap with good sidewall fusion degree can be performed.

Description

technical field [0001] The invention relates to a double tungsten electrode TIG narrow gap welding method with high deposition efficiency and high welding speed, specifically for the double tungsten electrode with a non-axisymmetric tip rotating tungsten electrode and the other ordinary axisymmetric conventional tungsten electrode for thick plates and medium-thick plates. The invention relates to a welding method with narrow gap, high deposition efficiency and high welding speed of a tungsten electrode welding system, which belongs to the technical field of TIG welding. Background technique [0002] Non-melting tungsten argon arc welding (TIG) is widely used in modern welding methods. It has the advantages of high weld quality and less spatter, and is generally used for precision instruments and high-quality welding. Its main disadvantages are low welding efficiency, limited current-carrying capacity of tungsten electrodes, limited arc power, and low deposition rate; narrow ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16
CPCB23K9/1675
Inventor 贾传宝魏斌吴玮闫强强
Owner SHANDONG UNIV
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