Welding method for Q460 high-strength steel tube of extra-high-voltage power transmission steel tube tower

A welding method and technology for power transmission steel, applied in welding equipment, arc welding equipment, tubular objects, etc., can solve the problems of low production efficiency, difficulty in large-scale production of high-strength steel pipes, etc., and achieve fast welding speed, excellent mechanical properties, energy high density effect

Active Publication Date: 2013-01-23
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention patent "Welding method of new Q460 steel for power transmission tower" proposes the use of manual electrode arc welding J607 electrode and CO 2 Gas shielded welding JM60 welding wire is used to weld the new Q460 high-strength steel. However, the method proposed in this invention patent has the disadvantage of low production efficiency and is difficult to apply to large-scale production of high-strength steel pipes.

Method used

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  • Welding method for Q460 high-strength steel tube of extra-high-voltage power transmission steel tube tower
  • Welding method for Q460 high-strength steel tube of extra-high-voltage power transmission steel tube tower
  • Welding method for Q460 high-strength steel tube of extra-high-voltage power transmission steel tube tower

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Embodiment 1

[0033] (1) Select Nb micro-alloying controlled rolling Q460 low-alloy high-strength steel, and the thickness of the steel plate is 12mm. The machining groove angle is 30°, the blunt edge is 2mm, and the groove gap is 2mm.

[0034] (2) The ambient temperature during welding is 20°C, without preheating before welding, and the interlayer temperature is controlled at 100-300°C.

[0035] (3) JM68 welding wire with a diameter of 1.2mm is used for bottom welding, CO 2 Continuous gas shielded welding, welding current is 160A, voltage is 21V, welding speed is 0.002m / s, welding line energy is 16.8KJ / cm, and one layer is welded by backing welding.

[0036] (4) Choose CHW-S9 submerged arc welding wire, SJ101 flux, submerged arc automatic welding and continuous welding to complete filling and cover welding, choose welding wire with a diameter of 3.2mm, welding current 600A, welding voltage 33V, welding speed 0.006m / s, welding The line energy is 33KJ / cm, and the number of welding layers i...

Embodiment 2

[0040] (1) Select Nb micro-alloying controlled rolling Q460 low-alloy high-strength steel, and the thickness of the steel plate is 12mm. The machining groove angle is 30°, the blunt edge is 2mm, and the groove gap is 2mm.

[0041] (2) The ambient temperature during welding is 20°C, without preheating before welding, and the interlayer temperature is controlled at 100-300°C.

[0042] (3) JM68 welding wire with a diameter of 1.2mm is used for bottom welding, CO 2Continuous gas shielded welding, welding current is 200A, voltage is 25V, welding speed is 0.003m / s, welding line energy is 16.7KJ / cm, and one layer is welded by backing welding.

[0043] (4) Choose CHW-S9 submerged arc welding wire, SJ101 flux, submerged arc automatic welding and continuous welding to complete filling and cover welding, choose welding wire with a diameter of 3.2mm, welding current 650A, welding voltage 34V, welding speed 0.008m / s, welding The line energy is 27.6KJ / cm, and the number of welding layers ...

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Abstract

The invention relates to a welding method for the Q460 high-strength steel tube of an extra-high-voltage power transmission steel tube tower, and the welding method comprises the following steps of: using a low-alloy high-strength steel plate having a yield strength of 460 MPa level, grinding the both sides of the low-alloy high-strength steel plate into single-surface grooves, bending the low-alloy high-strength steel plate into a primarily-formed steel tube with longitudinal slits, performing backing welding on welding joints, welding by means of CO2 gas shielded welding, and using JM68 welding wires; and continuously welding by means of submerged arc automatic welding during filling and covering, using CHW-S9 submerged arc welding wires, and using an SJ101 flux. According to the invention, aiming problems in welding for the Q460 high-strength steel tube, the CO2 gas shielded welding is combined with selection for the JM68 welding wires and reasonable welding parameters, and the CO2 gas shielded welding is combined with welding using the CHW-S9 welding wires and the SJ101 flux, thus improving the toughness and the quality of the welding joints, and increasing production efficiency and promoting the large-scale production simultaneously.

Description

technical field [0001] The invention relates to a welding method of high-strength steel pipes. Background technique [0002] UHV transmission technology has the characteristics of ultra-long-distance power transmission, ultra-large capacity and low loss. It is a transmission technology that has developed rapidly in recent years. The construction of UHV power grids is also considered to be the fundamental guarantee for meeting the continuous growth of power demand in the future. However, with the improvement of transmission capacity and voltage level of UHV transmission lines, the load and tower weight of transmission towers continue to increase, which puts forward higher requirements on the bearing capacity of transmission towers. Therefore, based on traditional low-alloy high-strength steel (yield strength ≤ 345MPa ) Angle steel towers made of steel have been difficult to meet the needs, and there is an urgent need to develop new high-strength steel towers. High-strength s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/18B23K9/235B23K9/095B23K101/06
Inventor 杜宝帅张忠文李新梅
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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