A welding method of q460 high-strength steel pipe for UHV transmission steel pipe 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
CN102886593BActive Publication Date: 2015-10-28ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
Publication Date
2015-10-28

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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.
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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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