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Rotary tungsten electrode TIG welding system for welding inner wall of extremely-small-diameter pipe fitting

A welding system and tungsten electrode technology, applied in the direction of electrode accessories, welding equipment, welding accessories, etc., can solve the problems of large overall structure, difficult welding of small-diameter pipe fittings, and enlarged structure volume, and achieve small and flexible welding heat input Good accessibility and accessibility, small size effect

Active Publication Date: 2021-12-21
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When performing welding repair work in narrow spaces such as heat exchangers and condensers with extremely small diameters such as nuclear power plants and super (super) critical power plants, the traditional rotary tungsten electrode TIG welding, its rotary drive device is closely connected with the tungsten electrode, The overall structure is too large, and it is impossible to enter the inside of the ultra-thin pipe for welding
In addition, cooling liquid and shielding gas need to be input during welding. After the welding torch is added with cooling and shielding gas transmission functions, the structural volume will be further increased, and it will be more difficult to enter extremely small diameter pipe fittings for welding

Method used

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  • Rotary tungsten electrode TIG welding system for welding inner wall of extremely-small-diameter pipe fitting
  • Rotary tungsten electrode TIG welding system for welding inner wall of extremely-small-diameter pipe fitting
  • Rotary tungsten electrode TIG welding system for welding inner wall of extremely-small-diameter pipe fitting

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Embodiment

[0045] Such as Figure 1 to Figure 8 As shown, this embodiment is a rotary tungsten TIG welding system for welding the inner wall of extremely small-diameter pipe fittings, including a rotary tungsten TIG welding torch, a high-frequency inverter welding power supply, a water cooling device, and a protective gas supply device; wherein, the high-frequency inverter The variable welding power supply includes the main circuit of the power supply and the welding control device.

[0046] The main circuit of the power supply includes a three-phase rectification and filtering module, a SiC high-frequency full-bridge inverter module, a high-frequency transformer, and a SiC fast full-wave rectification and filtering module connected in sequence. The SiC high-frequency full-bridge inverter module adopts a SiC full-bridge inverter topology with an inverter frequency up to 200kHz, which is mature and stable. SiC MOSFET is used as the power switch tube; the alternating current input from th...

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Abstract

The invention provides a rotating tungsten electrode TIG welding system for welding an inner wall of an extremely-small-diameter pipe fitting. The rotating tungsten electrode TIG welding system is characterized by comprising a rotating tungsten electrode TIG welding gun, a high-frequency inverter welding power supply, a water cooling device and a shielding gas supply device, wherein the high-frequency inverter welding power supply comprises a power source main circuit and a welding control device, the rotating tungsten electrode TIG welding gun comprises a conducting rod with a tungsten electrode and a rotating device, the conducting rod is connected to a power supply main circuit, the power supply main circuit and the rotating device are correspondingly connected to the welding control device, the welding control device is connected to the conducting rod through a high-frequency arc striking module, and the shielding gas supply device and the water cooling device are correspondingly connected to the conducting rod. The system can realize the welding operation of the inner wall of the extremely-small-diameter pipe fitting, can meet the requirements of water cooling and air supply in a narrow space, is ingenious and flexible in structure, has good wide working condition adaptability, and can be used for welding a welding seam which is good in fusion and uniform in appearance forming.

Description

technical field [0001] The invention relates to the technical field of welding systems, in particular to a rotary tungsten electrode TIG welding system for welding the inner wall of extremely small-diameter pipe fittings. Background technique [0002] Tungsten Inert Gas ArcWelding (TIG) has stable arc, excellent visibility, no droplet spatter, excellent welding quality, reliable welding process and stable welding effect. It is widely used in various industries, such as aerospace, large ships Manufacturing, automotive industry and nuclear industry etc. Among them, in the current industrial production, there is a wide range of pipe welding requirements: for example, in nuclear power plants, there are a large number of pipes to be repaired in condensers and heat exchangers of power stations, etc., and the quality of the welds during welding is extremely important in repair evaluation. It is relatively easy to achieve the purpose of welding on the outer wall of the pipe fitting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/10B23K9/28B23K9/26B23K9/32
CPCB23K9/167B23K9/1056B23K9/28B23K9/26B23K9/325
Inventor 王振民吴镐东张芩徐孟嘉吴祥淼
Owner SOUTH CHINA UNIV OF TECH
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