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Method for welding transverse narrow gap of steel for ocean platform

An offshore platform and welding method technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problem of restricting the platform delivery time, the market competitiveness of enterprises, the difficulty of ensuring product quality stability, and the difficulty in ensuring welding quality stability. problems, to ensure the consistency of weld formation, stress control, and high welding reliability.

Pending Publication Date: 2022-07-15
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the field of offshore platforms, manual welding is basically the main method. Preheating before welding, multi-layer and multi-pass welding, root cleaning in the middle, and heat treatment after welding have many production processes, low welding efficiency, long manufacturing cycle, and difficult product quality stability. It is guaranteed, and the labor intensity of the workers is high, the production environment is harsh, and the current production status seriously restricts the delivery time of the platform and the market competitiveness of the enterprise
Taking the welding of rack steel and rack steel, rack plate and half-chord tube as an example, the welding workload is huge, and it is difficult for workers to ensure the stability of welding quality under high-intensity work

Method used

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  • Method for welding transverse narrow gap of steel for ocean platform
  • Method for welding transverse narrow gap of steel for ocean platform

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment is applied to the welding of 60mm thick DH36 carbon steel, and the specific process is as follows:

[0035] 1) as figure 1 As shown, the U-shaped groove is selected, the bottom blunt edge size is 1.5mm, the bottom diameter is 8mm, and the top clearance is 9mm.

[0036] 2) Select the matching 1.2mmER70S-6 solid core gas shielded welding wire.

[0037] 3) Before welding, use mechanical grinding to remove rust, oil, moisture and other impurities on the surface of the steel plate to ensure the welding quality.

[0038] 4) After the groove is paired, it is necessary to connect the arc strike plate with the same shape as the groove at the start and end points of the weld bead to avoid defects such as pores in the actual welding area.

[0039] 5) Select the mixed gas of 90% argon and 10% carbon dioxide.

[0040] 6) The welding current is 150A, the voltage is 21V, the welding speed is 260mm / min, the swing angle range is 30-70°, and the sidewall dwell time is ...

Embodiment 2

[0046] This embodiment is applied to the welding of 155mm thick Q690. The specific process is as follows:

[0047] 1) as figure 2 As shown, the double-sided U-shaped groove is selected, the bottom blunt edge size is 2mm, the bottom diameter is 10mm, and the top gap is 16mm.

[0048] 2) Select the matching ESAB OK.69 solid core gas shielded welding wire.

[0049] 3) Before welding, use mechanical grinding to remove rust, oil, moisture and other impurities on the surface of the steel plate to ensure the welding quality.

[0050] 4) After the groove is paired, it is necessary to connect the arc strike plate with the same shape as the groove at the start and end points of the weld bead to avoid defects such as pores in the actual welding area.

[0051]5) Select the mixed gas of 80% argon gas and 20% carbon dioxide gas.

[0052] 6) Use ceramic heating sheet for preheating work before welding.

[0053] 7) The welding current is 125A, the voltage is 18V, the welding speed is 300...

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Abstract

The invention relates to a welding process, in particular to a transverse narrow gap welding method for steel for an ocean platform. A U-shaped groove is selected when the thickness is less than 100 mm, and a double-sided U-shaped groove is selected when the thickness is 100-200 mm; a solid-core or flux-core gas shielded welding wire with the diameter of 0.8-1.6 mm is selected; if a U-shaped groove is selected, the bottom truncated edge size is 1-2 mm, the bottom diameter is 7-9 mm, and the top gap is 8-10 mm, single-layer single-pass welding is carried out; the bottom diameter is 9-12 mm, the top gap is 12-20 mm, and single-layer double-channel welding is adopted; after the grooves are grouped, arc striking plates consistent with the grooves in shape are connected to the starting position and the final position of a welding bead; proper welding process parameters are selected; a laser tracking system is used for monitoring the position of the welding wire, and if abnormity occurs, the abnormity is fed back to a welding gun control system for self-adaptive adjustment; during double-sided welding, turning-over welding is carried out during 1-4 passes of welding, or double-sided simultaneous welding is realized by adopting a double-robot welding system; and in the last three or four welding processes, an external gas protection cover is added for welding.

Description

technical field [0001] The invention relates to a welding process, in particular to a lateral narrow gap welding method for steel used in offshore platforms. Background technique [0002] With the development of major technical equipment such as deep-sea oil and gas production platforms, the thickness and strength of plates are also increasing. Welding, the most important connection method, is also facing more and more severe challenges. At the same time, welding quality, The contradiction between welding cost and welding efficiency is increasingly apparent. [0003] The jack-up drilling platform is the mainstream marine engineering equipment for offshore oil and gas exploration (within a water depth of 200m).” To be able to “stand up, rise above, and pull out”, the pile legs are the key, and its structural design and The production and manufacture will directly affect the operation safety and use effect of the platform. The rack and half-chord are the core bearing componen...

Claims

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Application Information

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IPC IPC(8): B23K9/067B23K9/095B23K9/127B23K9/16B23K9/235B23K9/32B23K33/00
CPCB23K33/00B23K9/16B23K9/235B23K9/32B23K9/067B23K9/095B23K9/1274
Inventor 胡奉雅王佳骥韩严法袁野傅博付魁军于洋孙杭刘锦郭鹏
Owner ANGANG STEEL CO LTD