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Large-sized T shaped joint full penetration assembled welding process

A welding process and full penetration technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of reducing component fatigue strength, component failure, and easy to become a crack source

Inactive Publication Date: 2007-12-05
RG PETRO MACHINERY GROUP
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AI Technical Summary

Problems solved by technology

At present, the guide rails of offshore oil drilling platforms and the guide rails of offshore workover rigs are all welded structures without groove fillet welds. As large-scale welded structural parts, this welding method has the advantages of low production cost, high work efficiency, and small welding deformation. However, this welding method cannot achieve full penetration welding, and welding defects are prone to occur at the root. These welding defects can easily become the source of cracks when the component is under stress, reduce the fatigue strength of the component, and cause the overall failure of the component in severe cases.
Therefore, as an important load-bearing component, the guide rail objectively has higher welding quality requirements for its welds, especially for the mechanical properties of the welds. The impact absorption energy Akv(J) has higher requirements. Obviously, this welding method is difficult meet this requirement

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  • Large-sized T shaped joint full penetration assembled welding process

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Embodiment Construction

[0017] The present invention will be further described below in combination with specific embodiments.

[0018] As shown in Figure 1, the T-shaped guide rail of the offshore oil drilling platform is welded by the web 1 and the wing 2. Board dimensions (length × width × thickness mm) / material: 16000×350×30 / Q345A, as a large T-joint component, its full penetration combined welding process is as follows:

[0019] (1) The welded edge of the web is processed by the X2012 type gantry milling machine to produce a K-shaped groove, without leaving a blunt edge, and the groove angle is 45°.

[0020] (2) Along the length direction of the web, at intervals of 2m, place steel plate pads with dimensions of 100×50×3mm between the K-shaped groove of the web and the flange; There is a gap of 3mm between them.

[0021] (3) Along the length direction of the web, at intervals of 1m, spot-weld a rectangular tube positioning block □50×50×6mm / Q345A with a length of 200mm between one side of the we...

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Abstract

The completely penetrating composite welding process for large T-joint includes the following steps: 1. machining the welded edge of web plate to form K-shaped chamfer; 2. setting 1-3 mm thick locating steel blocks between the K-shaped chamfer of the web plate and the wing plate along the lengthwise direction of the web plate in the interval of 1-5 m; 3. spot welding locating blocks between the wing plate and the web plate along the lengthwise direction of the web plate in the interval of 0.8-2 m; 4. priming welding; and 5. stuffing welding and finishing welding on the K-shaped chamfer. The present invention can ensure completely penetrating during welding, avoid welding faults and form welding seam with mechanical performance not lower than the mother material.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and relates to a full-penetration combined welding process for a large T-shaped joint. Background technique [0002] T-joint welding refers to the formation of T-shaped welding between two welded parts, in which the erected welded parts are called webs, and the flat welded parts are called wing plates. Welding of large T-joints is widely used, such as welding T-beams and H-beams. The welding of T-shaped guide rail or H-shaped steel guide rail as an important stress-bearing part in offshore oil drilling platform and offshore workover machine is the specific application of large T-shaped joint welding in offshore oil facilities. The T-shaped guide rail or H-shaped steel guide rail The thickness of the wing and web is generally 25-30 cm, the length is 10-16 meters, and the material is mostly Q345 low-alloy steel. At present, the guide rails of offshore oil drilling platforms and the guide ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K33/00B23K9/095B23K9/16B23K9/18
Inventor 梁晓宇张勇王文尔李春明赵旭平
Owner RG PETRO MACHINERY GROUP
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