Narrow-gap GMAW (gas metal arc welding) method for band electrode

A strip-shaped electrode and narrow gap technology, which is applied in the direction of arc welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of poor fusion of side walls, achieve good heating and melting, low cost, and good fusion Effect

Inactive Publication Date: 2012-08-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the problem of poor fusion of the side wall in the existing narrow gap welding process, and to provide a strip electrode narrow gap GMAW method

Method used

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  • Narrow-gap GMAW (gas metal arc welding) method for band electrode
  • Narrow-gap GMAW (gas metal arc welding) method for band electrode
  • Narrow-gap GMAW (gas metal arc welding) method for band electrode

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specific Embodiment approach 1

[0012] Specific Embodiment 1: The strip-shaped electrode narrow-gap GMAW method in this embodiment is carried out according to the following steps: 1. Use a strip-shaped electrode with a rectangular cross-section as the melting electrode. The width of the strip-shaped electrode cross-section is 6-8mm, and the thickness is 0.2- 0.4mm, the belt feeding mechanism guides the strip electrode into the electrode holder in the welding torch, and then puts the welding torch into the gap of the workpiece to be welded. The gap size is 8-10mm, so that the width direction of the strip electrode is perpendicular to the welding direction. The protruding length of the strip electrode is 10-20mm; 2. Introduce the protective gas, adjust the voltage to 20-30V, start the welding power supply, feed the tape at a speed of 7-18m / min, ignite the arc, and carry out welding, which is completed Strip electrode narrow gap GMAW.

[0013] The material and thickness of the workpiece to be welded that are su...

specific Embodiment approach 2

[0014] Embodiment 2: This embodiment differs from Embodiment 1 in that: the flow rate of the protective gas introduced in step 2 is 15-30 L / min. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the welding speed in step 2 is 20-30 cm / min. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a narrow-gap GMAW (gas metal arc welding) method for a band electrode, which solves the problem of incomplete sidewall fusion of an existing narrow-gap welding process. The method includes the steps: firstly, using the band electrode with a rectangular section as a consumable electrode, leading the band electrode into an electrode clamp in a welding gun by the aid of a band electrode feeding mechanism, placing the welding gun into a gap of a workpiece to be welded and leading the width direction of the band electrode to be perpendicular to a welding direction; and secondly, leading in shielding gas, adjusting voltage, starting a welding power supply, feeding the band electrode, igniting arcs and performing welding to complete narrow-gap GMAW for the band electrode. By the aid of the method, complete sidewall fusion is realized, and the defects of porosity, inclusion and the like are avoided. Welding parameters are fewer, the method is simple, operation is convenient, equipment is simple, the cost is low, and the method is used for the field of gas shielded welding for the consumable electrode.

Description

technical field [0001] The invention relates to a strip electrode narrow gap GMAW method. Background technique [0002] Narrow-gap GMAW (gas metal arc welding) is a common welding technique for components thicker than 20mm. In practical applications, this method generally adopts a unilateral groove angle of 0° to 3°, and a width of 9 to 12mm at the bottom of the groove. Since the narrow-gap groove greatly reduces the filling amount of weld metal and improves welding efficiency and joint performance, narrow-gap GMAW is an efficient, high-quality, and energy-saving welding method, which has become the focus of practical application and research. [0003] However, due to the small opening angle of the GMAW arc, the arc concentrates on the bottom of the groove, and under low heat input, it is easy to produce sidewall unfused, which is the most critical problem of the narrow gap GMAW technology. Therefore, the core idea of ​​narrow-gap GMAW is to enhance the heating effect of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/02B23K35/06
Inventor 高洪明郑森木
Owner HARBIN INST OF TECH
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