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A rapid submerged arc welding method for manufacturing x90 pipeline steel

A pipeline steel, rapid welding technology, applied in the field of rapid submerged arc automatic welding, high-strength pipeline steel without preheating before welding, high-speed submerged arc welding, can solve cold cracks, large hardenability, weld strength and toughness matching, etc. problem, achieve the effect of preventing welding cracks, high plasticity and toughness reserves, and avoiding welding cracks

Inactive Publication Date: 2015-08-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, for the manufacture and production of X90 pipeline steel, there are still some problems in welding, such as high hardenability, obvious cold crack tendency, weld strength and toughness matching, welding efficiency, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The rapid welding of X90 high-strength pipeline steel with a thickness of 16mm, the size of the two test plates is 500mm×1200mm×16mm. Using Ar+CO 2 Inner seam welding with mixed gas shielded welding, Ar and CO 2 The volume ratio of gas is 85%:15%. Fast submerged arc welding is used to weld the outer seam.

[0029] (1) Welding equipment and welding materials

[0030] Welding equipment adopts inverter welding machine and DC submerged arc welding machine with good dynamic characteristics. Mixed gas shielded welding uses 800MPa high-strength and high-toughness solid wire with a diameter of 1.2mm, and submerged arc welding uses a 800MPa wire with a diameter of 4.0mm with high-alkalinity sintered flux to remove oil, rust and other dirt on the surface of the wire before welding.

[0031] (2) Preparation before welding

[0032] The butt joints of two X90 pipeline steel plates with a thickness of 16mm are respectively made with a V-shaped groove by grinding with a grinding ...

Embodiment 2

[0039] High-speed welding of X90 high-strength pipeline steel with a thickness of 20mm. The dimensions of the two test plates are both 800mm×1600mm×20mm, and they are flat butt welded. Using 85%Ar+15%CO 2 The inner weld is welded by the mixed gas shielded welding method, and the outer weld is welded by high-speed submerged arc automatic welding.

[0040] (1) Welding equipment and welding materials

[0041] Welding equipment adopts inverter welding machine and DC submerged arc welding machine with good dynamic characteristics. Mixed gas shielded welding uses 800MPa high-strength and high-toughness solid wire with a diameter of 1.2mm, and submerged arc welding uses a 800MPa wire with a diameter of 4.0mm with high-alkalinity sintered flux to remove oil, rust and other dirt on the surface of the wire before welding.

[0042] (2) Preparation before welding

[0043] The butt joints of two X90 pipeline steel plates with a thickness of 20mm are respectively made with a V-shaped gr...

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Abstract

The invention discloses a preheating-free fast welding method for X90 high-strength pipeline steel. According to the welding characteristics of circumferential weld joints in high-strength pipeline steel manufacturing, Ar+CO2 mixed gas shielded welding is conducted on welding joints in the pipeline steel by adopting 800MPa high-strength high-toughness solid welding wires, and double-wire fast submerged-arc automatic welding is conducted on welding joints outside the pipeline steel by matching 800MPa high-strength high-toughness welding wires with CaO-CaF2-Al2O3 series alkali sintered flux. For achieving double-wire fast submerged-arc welding of the X90 pipeline steel, the high-strength and high-toughness welding wires are adopted and are matched with the alkali sintered flux. The welding speed and the welding current are strictly matched with the critical range of the arc voltage. By means of the method, X90 pipeline steel can be welded fast under the condition of no preheating, the whole welding connector has high ductility and toughness reserve, welding cracks cannot be generated, and high welding production efficiency can be achieved. The fast submerged-arc welding method for X90 pipeline steel manufacturing has the advantages of being low in production cost, easy and convenient to operate and strong in applicability and has good application prospect.

Description

technical field [0001] The invention relates to a high-speed submerged arc welding method for manufacturing X90 pipeline steel, in particular to a fast submerged arc automatic welding method for high-strength pipeline steel without preheating before welding, and belongs to the field of welding technology. Background technique [0002] High-strength pipeline steel for transporting oil and natural gas is developed on the basis of low-alloy controlled-rolled steel. For the large-diameter and high-strength pipeline steel for transporting oil and natural gas, since the development of X52 pipeline steel in the mid-1960s, it has developed to the later X70, X80, and X90 pipeline steel. The carbon content in the steel is reduced from 0.1% to 0.14% to 0.01% to 0.04%, and the carbon equivalent is correspondingly reduced from 0.45% to below 0.35%. The microstructure develops from ferrite + pearlite to acicular ferrite, which greatly improves the crack resistance of pipeline steel. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/16B23K9/235B23K33/00B23K35/24B23K35/362
Inventor 李亚江王娟张永兰
Owner SHANDONG UNIV
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