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Welding method for Q460C high-strength steel in extra-high-pressure steel tube tower

A welding method and technology for steel pipe towers, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of large welding workload and cumbersome operation process, so as to improve welding quality, reduce workload, reduce the number of layers and The effect of the number of tracks

Active Publication Date: 2019-11-01
HENAN DINGLI POLE TOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The welding workload is large and the operation process is cumbersome

Method used

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  • Welding method for Q460C high-strength steel in extra-high-pressure steel tube 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 weld passes 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 accelera...

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 wire, 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 welding is completed,...

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 invention provides a welding method for Q460C high-strength steel in an extra-high-pressure steel tube tower. The welding method comprises the following steps that (1) a groove form is determined,wherein a V-shaped groove is adopted, the angle of the groove is 40 degrees to 50 degrees, and a gap is 2 mm to 3 mm; (2) preheating is performed until the temperature reaches 135 DEG C to 165 DEG C;(3) welding is performed, wherein gas shielded welding or submerged arc welding is adopted for welding, welding of one layer is performed at least, and the number of welding beads in the single welding layer is one; and (4) vibrating is performed, wherein in the preheating and welding processes, a vibration aging device is adopted for stress elimination. According to the welding method, the layernumber and the pass number of welding are reduced, so that the welding workload is reduced, and meanwhile, the tensile strength, the welding seam zone impact power and the heat affected zone impact power of the Q460C high-strength steel after welding are all improved.

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 Applications(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
Owner HENAN DINGLI POLE TOWER