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Welding method of q460c high-strength steel in UHV steel pipe tower

A welding method and steel pipe tower technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of heavy welding workload and cumbersome operation process

Active Publication Date: 2021-09-14
HENAN DINGLI POLE TOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The welding workload is heavy and the operation process is cumbersome

Method used

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  • Welding method of q460c high-strength steel in UHV steel pipe tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for welding Q460C high-strength steel in an ultra-high pressure steel pipe tower, comprising the following steps:

[0030] (1) Groove form: Q460C steel plate thickness is 10mm, butt welding, V-shaped groove is adopted, the groove angle is 40°, and the gap is 2-3mm;

[0031] (2) Preheat to a temperature of 135°C, and start to vibrate after preheating to a temperature of 100°C, with a vibration acceleration of 10m / s 2 ;

[0032] (3) Welding: Gas shielded welding is used for one-layer welding. The number of welds in a single welding layer is 1. The process parameters of gas shielded welding: the gas contains 80% Ar+20% CO 2 , using ER55-G solid welding wire, welding wire diameter 1.2mm, welding current 220A, welding voltage 23V, welding speed 200mm / min, heat input 12KJ / cm, welding and vibration start at the same time, vibration acceleration is 15m / s 2 ;

[0033] After the welding is completed, continue to vibrate for 10 minutes, and the vibration acceleration i...

Embodiment 2

[0035] A method for welding Q460C high-strength steel in an ultra-high pressure steel pipe tower, comprising the following steps:

[0036] (1) Groove form: Q460C steel plate thickness is 12mm, butt welding, V-shaped groove is adopted, the groove angle is 45°, and the gap is 2-3mm;

[0037] (2) Preheat to a temperature of 150°C, and start to vibrate after preheating to a temperature of 100°C, with a vibration acceleration of 12m / s 2 ;

[0038] (3) Welding: Gas shielded welding is used for welding, and two-layer welding is performed, including a layer of bottom welding layer and a layer of filling and covering welding layer. The number of weld passes in a single welding layer is 1, and the gas contains 80% Ar +20%CO 2 , using ER55-D2-Ti solid welding wire, welding wire diameter 1.2mm, welding current 230A, welding voltage 25V, welding speed 250mm / min, heat input 13KJ / cm, welding and vibration start at the same time, vibration acceleration is 20m / s 2 ;

[0039]After the weldi...

Embodiment 3

[0041] A method for welding Q460C high-strength steel in an ultra-high pressure steel pipe tower, comprising the following steps:

[0042] (1) Groove form: Q460C steel plate thickness is 14mm, butt welding, V-shaped groove is adopted, the groove angle is 50°, and the gap is 2-3mm;

[0043] (2) Preheat to a temperature of 165°C, and start to vibrate after preheating to a temperature of 100°C, with a vibration acceleration of 15m / s 2 ;

[0044] (3) Welding: Gas shielded welding is used for welding, and two-layer welding is performed, including a layer of bottom welding layer and a layer of filling and covering welding layer. The number of weld passes in a single welding layer is 1, and the gas contains 80% Ar +20%CO 2 , using ER55-D2-Ti, welding wire diameter 1.2mm, welding current 240A, welding voltage 26V, welding speed 300mm / min, heat input 15KJ / cm, welding and vibration start at the same time, vibration acceleration is 25m / s 2 ;

[0045] After the welding is completed, c...

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Abstract

The present invention proposes a Q460C high-strength steel welding method in an ultra-high pressure steel pipe tower, comprising the following steps: (1) Groove form: V-shaped groove is adopted, the groove angle is 40-50°, and the gap is 2-3mm; (2) ) preheated to a temperature of 135-165°C; (3) Welding: use gas shielded welding or submerged arc welding for welding, at least one layer of welding, and the number of weld passes in a single welding layer is 1; (4) Vibration: During the heat and welding process, the vibration aging device is used for stress relief. The invention reduces the number of layers and passes of welding, thereby reducing the workload of welding, and at the same time improves the tensile strength of the Q460C high-strength steel after welding, the impact energy of the weld zone and the impact energy of the heat-affected zone.

Description

technical field [0001] The invention relates to the technical field of high-strength steel welding, in particular to a welding method for Q460C high-strength steel in an ultra-high pressure steel pipe tower. Background technique [0002] Q460C high-strength steel has many advantages in the field of UHV steel pipe tower processing. The use of Q460 high-strength steel can not only increase the load capacity of the tower, but also effectively reduce the weight of the tower by 8-12%, saving the overall cost by 5%-8%. However, its weldability restricts the popularization and application of Q460C high-strength steel to a certain extent. It has a large hardening tendency, and the heat-affected zone is easy to form a hard and brittle martensitic structure. The plasticity and toughness are reduced, the stress resistance is reduced, and the cold crack is inclined. Increase. [0003] Existing Q460C high-strength steel mainly adopts multi-layer and multi-pass welding process. CN1085266...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/18B23K9/235B23K9/32B23K33/00
CPCB23K9/16B23K9/18B23K9/235B23K9/32B23K33/00
Inventor 张文涛赵松山宋刚牛景丽杨亚萍
Owner HENAN DINGLI POLE TOWER
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