A welding process method of thick plate narrow gap tungsten argon arc welding

A technology of argon tungsten arc welding and welding process, which is applied in the direction of welding equipment, welding accessories, arc welding equipment, etc., and can solve the problem that the magnetic control arc method cannot weld easily magnetized materials, the gas protection of the weld seam, and the welding gap Solve problems such as limited width range, achieve the effect of improving welding construction efficiency, improving welding quality, metallurgical properties and mechanical properties

Active Publication Date: 2021-12-07
SHANDONG UNIV +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] At present, there are three main realization methods of narrow-gap tungsten argon arc welding: one is through the tilted tungsten electrode with straight tungsten electrode or double tungsten electrode double welding power structure, this structure can ensure effective side wall fusion, but the structure is complex and can be Welding gap width range is limited
One is to generate a swinging arc by swinging the inclined tungsten electrode in the gap to effectively heat the side walls on both sides, but there are also problems such as limited welding gap width and complex and expensive equipment structure.
The other is to control the heating range of the arc by means of external constraints, including the method of externally applying a transverse magnetic field and rotating the ceramic sheet to constrain the arc, but the magnetron arc method cannot weld easily magnetizable materials and needs to solve the problem of the magnetic field generation circuit. Rotating ceramics The welding efficiency of the sheet-constrained arc method is low, and the ceramic sheet needs to be replaced regularly, and there are also problems in the gas protection of the weld due to the introduction of air by the rotation of the ceramic sheet

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  • A welding process method of thick plate narrow gap tungsten argon arc welding
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  • A welding process method of thick plate narrow gap tungsten argon arc welding

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Embodiment 1

[0069] A thick plate narrow gap tungsten argon arc welding process, comprising the following steps:

[0070](1) Groove opening and groove treatment: 16Mn plate thickness 150mm, U-shaped groove on one side, 10mm narrow gap reserved, blunt edge reserved, rust removal at the groove; groove size: ① round bottom Arc transition radius R = 2.0mm; ② The protruding length of the blunt edge is 2.5mm, and the thickness of the blunt edge is 2.5mm; ③ The gap between the two sides is 1.0mm; ④ The groove angle is 0°;

[0071] (2) Clamping: A narrow-gap tungsten argon arc welding equipment is used. The equipment includes a frame, a workbench, a welding torch, a wire feeding system, a water cooling system, a laser sensor, and an arc pressure sensor; the top of the welding torch passes through the air intake pipe and the gas cylinder. The top of the welding torch is connected to the welding power supply through the power wire. The water cooling system includes the water inlet pipe, the return p...

Embodiment 2

[0092] A thick plate narrow gap tungsten argon arc welding process, the steps are as described in embodiment 1, the difference is:

[0093] In step (1), the thickness of the 16Mn plate is 300 mm, U-shaped grooves are opened on both sides, and the gap width is 10 mm;

[0094] In step (2), the welding seam of the workpiece is fixed vertically downwards, and the method of vertical welding is adopted; two welding equipment are selected, respectively located on both sides of the workpiece, and welded vertically;

[0095] In step (3), a tungsten electrode with a diameter of 6.0 is selected, and the extension distance of the tungsten electrode is 150 mm;

[0096] In step (5), 50 layers are respectively welded on both sides of the 300mm thick plate, welding in layers, and the interlayer temperature is controlled below 100°C. The wire feeding speed is 260cm / min, the arc voltage is 18V, the welding current is 320A, the wire preheating current is 70A, the welding speed is 8cm / min, and t...

Embodiment 3

[0098] A thick plate narrow gap tungsten argon arc welding process, the steps are as described in Example 1, the difference is that in step (1), the groove size is: ① bottom arc transition radius R = 1.0mm ;②The protruding length of the blunt edge is 1.0mm, and the thickness of the blunt edge is 1.0mm;

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Abstract

The invention relates to a thick plate narrow-gap argon tungsten arc welding process method, which belongs to the technical field of narrow-gap welding. The narrow-gap argon tungsten arc welding equipment is used to carry out ultra-thick plate (0 ‑300mm), narrow gap (4‑10mm) automatic welding, the steps include: (1) beveling, groove treatment, (2) clamping narrow gap tungsten argon arc welding equipment, (3) installing tungsten electrode, Equipment programming, (4) positioning: move the tip of the tungsten electrode of the welding torch to the bottom of the center of the weld, place the gas mask above the weld, and then perform secondary positioning through laser ranging; (5) weld bottom welding: during the welding process Carry out arc voltage and laser tracking to ensure the centering of tungsten electrodes, use AC pulsed hot wire TIG welding technology, and adjust the welding current and pulse frequency to accurately control the heat input of the weld seam, (6) layered center filling welding: (7) cover surface welding. Compared with ordinary argon tungsten arc welding, it greatly increases the weldable plate thickness, production efficiency and production quality.

Description

technical field [0001] The invention relates to a thick plate narrow-gap tungsten argon arc welding process and belongs to the technical field of narrow-gap welding. Background technique [0002] Narrow gap welding (NGW) is mainly used in thick plate welding. Before welding, the position of the welded joint is not beveled or beveled at a small angle, and a narrow and deep gap is left. The traditional welding method is adopted. Realize high-efficiency welding of workpieces. [0003] At present, there are three main realization methods of narrow-gap tungsten argon arc welding: one is through the tilted tungsten electrode with straight tungsten electrode or double tungsten electrode double welding power structure, this structure can ensure effective side wall fusion, but the structure is complex and can be The gap width range for welding is limited. One is to generate a swinging arc by swinging the inclined tungsten electrode in the gap to effectively heat the side walls on b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/32B23K9/133
CPCB23K9/133B23K9/167B23K9/235B23K9/32
Inventor 贾传宝张治卫
Owner SHANDONG UNIV
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