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Welding device capable of controlling and reducing submerged-arc welding weld metal oxide inclusions

A welding device and weld metal technology, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of oxidized inclusions and oxygen content that cannot be effectively controlled

Inactive Publication Date: 2015-04-22
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical problem in the prior art that the oxidized inclusions and oxygen content in the deposited metal of submerged arc automatic welding cannot be effectively controlled, the present invention provides a welding device that can control and reduce the oxidized inclusions in the submerged arc welding weld metal , the device realizes the application of an auxiliary external electric field between slag and gold during welding, which can effectively reduce the probability of ions combining with each other to form oxide inclusions, and control the size and distribution of inclusions in the weld

Method used

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  • Welding device capable of controlling and reducing submerged-arc welding weld metal oxide inclusions
  • Welding device capable of controlling and reducing submerged-arc welding weld metal oxide inclusions
  • Welding device capable of controlling and reducing submerged-arc welding weld metal oxide inclusions

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Embodiment 1

[0031]The auxiliary electric field includes a DC power supply and metal conductive electrodes. The DC power supply adopts a 30V / 50A DC stabilized power supply. The output anode of the DC power supply is connected to the base metal 5, and the cathode is connected to a tungsten rod of Φ3.2mm. Fix the tungsten rod on the welding torch with an insulating resin chuck to insulate it from the main welding circuit. During welding, it moves synchronously with the head and the molten pool. There are two ways to adjust the depth of the tungsten rod inserted into the welding arc 3 area. One is before welding. Loosen the tungsten rod insulating resin fixing chuck during trial welding, so that the tungsten rod can be freely adjusted up and down to an appropriate position and then tighten the fixing chuck; secondly, the welding torch height can be adjusted together with the machine head when proper adjustment is required during the welding process , so that the tungsten electrode is always in...

Embodiment 2

[0045] In summary, the implementation conclusion of the technical solution of the present invention:

[0046] (1) The auxiliary external electric field ionizes the complex particles inside the molten pool metal 4 through the action of the electric field, and the positive and negative ions form mutually opposite ion flows, which effectively reduces the chance of oxide formation before the molten pool solidifies and crystallizes, which is beneficial to the weld metal 7 form small and scattered inclusions;

[0047] (2) The auxiliary external electric field promotes the migration of oxide-forming elements inside the molten pool metal 4 to the slag and is preferentially oxidized by the free oxygen ions in the slag at the slag-melt pool interface and then enters the slag, weakening the influence of the slag on the molten pool. Oxidation of metal 4 significantly reduces its oxygen content.

[0048] The present invention and its implementations have been schematically described above...

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Abstract

The invention discloses a welding device capable of controlling and reducing submerged-arc welding weld metal oxide inclusions and belongs to the field of submerged-arc welding. The welding device comprises a welding torch, a main welding circuit and an auxiliary circuit capable of forming an auxiliary welding electric field, the auxiliary circuit comprises a direct-current power source and a metal conducting electrode, and one end of the direct-current power source is connected with a base metal while the other end of the direct-current power source is connected with the metal conducting electrode. The slag-metal auxiliary external electric field is applied by the device with welding in a welding process, the probability of forming oxide inclusions due to mutual combination of ions can be effectively reduced, and the size and distribution of the inclusions in welding seams are controlled.

Description

technical field [0001] The invention belongs to the field of submerged arc welding, and more specifically relates to a welding device capable of controlling and reducing oxidized inclusions in weld metal formed by automatic submerged arc welding. Background technique [0002] In the existing submerged arc welding, the flux is first piled on the weldment, and then the continuously supplied welding wire is buried, and the welding is performed after the arc is struck, and welding slag is continuously generated. At this time, the arc is buried by the flux, and the molten pool metal formed is not It is convenient for direct observation, and the flux plays a protective role. Submerged arc welding is mostly used for high-efficiency welding of thick steel plates due to the thicker wire diameter, large current and deep molten pool. [0003] Submerged arc automatic welding, which uses a large current to generate an arc under the flux layer, forms a large volume of liquid molten pool ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/10B23K9/24
Inventor 李晓泉
Owner NANJING INST OF TECH