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TIP TIG welding method of LNG storage tanks

A welding method and storage tank technology, applied to welding equipment, arc welding equipment, household containers, etc., to achieve the effects of simple groove processing, small deformation, and concentrated arc energy

Inactive Publication Date: 2016-02-10
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to propose a TIPTIG welding method for LNG storage tanks that can meet the high quality and high efficiency of the LNG inner tank wall in view of the backwardness of manual welding in the prior art, so as to meet the production needs of LNG storage tanks

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  • TIP TIG welding method of LNG storage tanks

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Embodiment Construction

[0025] Please refer to figure 1 Shown, the present invention discloses LNG storage tank TIPTIG welding method, it comprises the following steps:

[0026] Step 1: Install a tungsten electrode with a diameter of 3.2mm for the welding equipment, the grinding angle of the tip of the tungsten electrode is 40°~50°, and the diameter of the tip of the tungsten electrode is 0.8mm.

[0027] Step 2: Select the welded joint of 9% NI steel plate with the wall plate thickness of the LNG inner tank of 17~22mm, the groove form adopts X-shaped welding groove, the minimum gap at the root of the workpiece is 2.0~2.4mm, and the groove angle is 60°, Blunt edge 1.0~1.5mm. Grind to remove attachments within 25mm on both sides of the weld groove to prevent oil, water, and rust pollution.

[0028] Step 3: The TIPTIG welding machine adopts DC positive connection, connects the positive pole of the welding power supply and the hot wire power supply to the welding base material, connects the negative p...

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Abstract

The invention relates to a TIP TIG welding method of LNG storage tanks. The welding system comprises control functions of automatic adjustment of arc pressure height, laser automatic tracking of welding seams, the heat input amount of welding wires, the speed adjustment of wire feeding, an oscillator, welding current pulses and the like in cooperation, and the welding method comprises the welding process of a pre-welding preparation stage, invoking welding technology parameters, and automatic system adjustment in the welding construction process, wherein the pre-welding preparation stage comprises the following sub-steps of: according to the welding technology requirement, performing burnishing pretreatment on the plate end bevels of the workpieces to be welded and the shapes of the end parts of tungsten electrodes, and adjusting the angles and the positions of tungsten electrodes and welding wires; realizing centering of the welding steams by laser scanning; and invoking the welding technology parameter group of back welding, stuffing, surface covering and the like to perform welding construction. According to the TIP TIG welding method of LNG storage tanks disclosed by the invention, a favorable welding steam forming effect can be achieved, the welding efficiency is high, and the quality of the welding steams is stable.

Description

technical field [0001] The invention relates to a TIPTIG welding method for LNG storage tanks, which is mainly applied to the construction of LNG storage tanks. Background technique [0002] As a clean, efficient and environmentally friendly energy source, liquefied natural gas is becoming more and more popular. With the adjustment of my country's energy structure, my country has taken the implementation of the LNG (Liquefied Natural Gas, LNG for short) import diversification development strategy as an important part of the national energy strategy. The welding technology of 9% Ni steel for LNG storage tank is the focus of current technology development. The welding of 9Ni steel in the vertical welding seam of the wall plate mainly relies on manual arc welding (SMAW) or argon tungsten arc welding (GTAW). Among them, the welding workload of manual argon arc welding is large, the welding efficiency is low, the working conditions are poor, the strength is high, and the welding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235B23K33/00B23K101/12
CPCB23K9/167B23K9/235B23K33/004B23K2101/125
Inventor 黄玲付伟许家忠尤波李东洁张宇
Owner HARBIN UNIV OF SCI & TECH
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